Spiral bevel gear of descriptive geometry and mechanical drawing, assembly drawing is the designers to express design intent, producer production of important technical documents according to drawing. HUST assembly drawing is a kind of machine or parts, reflect the working principle of the component, and assembly relations

 

A, the content of the assembly drawing

 

The major parts of the main structure, etc. 1. A group of view 1. 2. A set of views need size 2. Necessary size 3. Parts number 3. The part number 4. 4 schedule list title bar 4. 4 technical requirements technical requirements

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Two, representations of the basic assembly drawings

(1) two parts of the contact surface or with matching requirements (1) two parts of the surface of the contact surface or with cooperate with the requirements of the draw a line, don't contact surface painting line 2. Draw a line on the surface, not contact draw two lines.

 

2) the section line direction between two parts should be the opposite or 2) between two adjacent parts of section line direction should be the opposite or different isolation. Separated. But the direction of the section line of the same part in the various views and spacing should be consistent. The direction of the line and spacing should be consistent. (3) in the sectional view, if the profile control (3) in the sectional view, in the section Tangent plane through the solid bar or the axis of the threaded fasteners, the axis of the threaded fasteners, drawn by not cutting. By not cutting drawing.

1.1 d

Three, view selection of assembly drawings According to the parts of structure, from the assembly line to select view. The view selection principles:

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View right amount, then look at the picture and drawing. Main assembly Assembly line assembly line Main view options: reflecting parts working position and the main assembly line. Other view selection: complementary expression other assembly lines (secondary assembly lines).

Assembly lines: in order to achieve a certain function together a bunch of parts. To achieve the main function of or containing parts more With main referred to as the main assembly, vice versa As the main assembly time.

Four, assembly process structures on the assembly drawing to properly express the reasonable structure of assembly and connection way between parts.

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Chapter 14 assembly drawing § 9-2 special expression method of assembly drawings

A, remove the drawing (1) to be part of a parts keep out, but in view of the hypothetical down to express certain parts. But should be marked "down x parts", or "down x number zero parts". (2) sometimes recoverable with remove belt cutting method.

Special expression method of § 9-2 assembly drawings

Two, imaginary parts drawing (1) said the limit of the moving parts of a place, with two point line supposed to draw the wheel profile.

Rolling bearing saddle axis adjusting ring screw gasket end cover seal key ring gasket bolts

The bolt head simplified representations Oil seal simplified representations

(2) to express does not belong to a thing, and related to the component parts, also with double point line draw with the outline of part.

Rolling bearing simplified representations

Gasket simplified representations

Screw after omitting expressed in the center line of the position

Figure 14-9 exaggerated drawing simplified representations and hypothetical illustration

Special expression method of § 9-2 assembly drawings

Three, simplified representations (1) parts on process structures, often not drawn. (2) of the uniform distribution of the same specifications of the screw fittings, allowing only a set, the rest of the application of the center line of the table position. (3) for rolling shaft bearing and seal ring, only paint one side, on the other side with a simplified representations.

Rolling bearing saddle axis adjusting ring screw gasket end cover seal key ring gasket bolts

The bolt head simplified representations Oil seal simplified representations

Rolling bearing simplified representations

Gasket simplified representations

Screw after omitting expressed in the center line of the position

Figure 14-9 exaggerated drawing simplified representations and hypothetical illustration

Special expression method of § 9-2 assembly drawings

Four, exaggerate the illustration

Rolling bearing saddle adjustment ring screw gasket end cover seal key ring gasket bolts

Not contact surface and the shaft with the gap between small, shims, small diameter of the spring and so on, can not draw in proportion, and appropriately increase the dimension drawing.

The bolt head simplified representations Oil seal simplified representations

Rolling bearing simplified representations

Gasket simplified representations

Screw after omitting expressed in the center line of the position

Figure 14-9 exaggerated drawing simplified representations and hypothetical illustration

Special expression method of § 9-2 assembly drawings

Five, drawing To express is not associated with a plane and mutual parallel axis zero parts, and the transmission relationship between the shaft and the shaft, can according to the transmission sequence After cut open along the axis, and this axis will show open to draw on the same plane, and marked "XX".

Special expression method of § 9-2 assembly drawings

Six, separate notation In the assembly drawing, sometimes especially want to say Ming a part of structure shape, is to separate the parts of a visual plotted on a graph, but in view of the above To label the part name of the view, near the corresponding view With the arrows indicate the direction of the cast shadow, and the characters on the same note.

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Chapter 14 assembly drawing § 9-3 assembly dimension and note writing

A, dimensioning principles: on the assembly drawing is complete, clear and reasonable. Don't have to be marked on the assembly drawing all dimensions of the parts, just note the following five kinds of size 1. Specification size (size) performance: the performance of components or specifications (2) assembly size (1) size: said with properties between parts (2) the relative position of important dimensions: assembly must ensure that the 3. When installation size: machine needed to be installed to the other on the basis of size 4. Overall dimensions: length, overall width, total height 5. Some important size: such as gear center distance note: all kinds of size correlation, a size may have many meanings.

Size (size) performance dimension important position size installation size Overall dimensions Some important size

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Chapter 14 assembly drawing § 9-3 special expression method of assembly drawings

Two, in the design of technical requirements on assembly drawing, the part or machine assembly, installation, inspection and shipment must achieve the target, and some quality, appearance requirements. Technical requirements can be the reference of similar products, combined with the specific conditions to prepare, write in the picture at the bottom right corner.

Three, parts of the serial number 1. The principle of part Numbers Shape size identical parts only a number, the number must be written in the list. And different parts of a certain size, same shape must be numbered respectively. Rolling bearing, motor and other standard parts, only need to write into a serial number. 2. The method of serial Numbers

Serial number should be order note is written in the view, size, etc, neatly. Guide line (thin lines) should be from the parts of visible entities within the contour, plus a short line or circle, allowed turn again.

Four, parts lists 1. The top of the list on the title bar, the place is not enough, part can be moved to the title bar Left. Note: the schedule of the top thin lines are used to draw the border lines of regulations. 2. The parts are symbols to big order from bottom to top. 3. For standard parts, and shall, in accordance with the provisions of the mark in the inner parts name column.

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On existing machine or parts, by observing the appearance and work situation, draw the assembly diagram, parts drawing and assembly drawing, and then by the assembly diagram drawing parts working drawing, surveying and mapping. This process is called parts, a clear object of surveying and mapping work and the structural characteristics In front of the surveying and mapping, to refer to relevant technical data, such as manual (including said the advertisement of the product (Ming), etc., to find the work parts; through the observation or to run to analyze the components of the role of the various parts of the structure, determine the relative position of the relationship between the parts, assembly relation and connection manner. The following cut-off valve of surveying and mapping, for example

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Found in the room of surveying and mapping graphic cut-off valve. Contrast material, refer to instructions Can know: the globe valve is a control fluid flow regulating valve. Turn the handle, through the stem drive the ball Disc rotation, can close or adjusting the size of the flow quantity.

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Two, disassemble parts, drawing assembly diagram 1. Open control main first: handle, cap nut, packing gland, packing, the stem (2) main bearing down again: 4 nut, valve cover, 4 stud, sealing ring 1 and ring 2 on the left, right sealing ring 2, disc, valve body (3) open while drawing assembly diagram 4. Draw sketches of non-standard parts (the same as the parts of surveying and mapping)

Handle the packing gland cover nut stem packing of spherical valve body sealing ring 2 cover sealing ring 1 4 stud

Four nuts

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2, remove components, draw the assembly diagram

Three, one draw sketches of non-standard parts

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2, remove components, draw the assembly diagram Remove note down in assembly line order. Remove when should pay attention to the following: (1) prepare label, to remove the parts should be numbered; For standard parts don't need to draw, but still want to measure, see have connection relationship with other parts size are consistent; Down and draw the assembly diagram, in order to record the parts assembly location, name. (2) pay attention to the disassembly process, for not detachable connection (such as welding, riveting, interference fit) is generally not hurt, for a tight fit also can not hurt, but should also note to restore after assembly still keep unchanged with precision, operate freely, to meet the demand of the production or use.

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Chapter 14 assembly drawing § 9-5 drawing parts assembly drawing

One, to express solutions, choose the main direction To express solution,

Main view to express the assembly relationship it as often as possible, the location of the relationship between parts, as far as possible reflect the principle of work, or work. Generally choose working position and reflect more the direction of the main parts as the main direction. The other views should have their own focus, the choice of auxiliary main view clearly express parts. Complete analysis: the cutter head has three assembly lines, support the main line, input line and output line

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Chapter 14 assembly drawing § 9-5 drawing parts assembly drawing

Two, draw assembly drawings of method 1. By outside introversion, starting from the core parts (axis), according to the assembly relationship between expansion exhibition draw step by step, various parts of the drawing of shell of tolerance. For new design.

1, 2 scrolls bearing, pay attention to the bearing position 3. Draw the left end cover 4. 5. Draw a body painting right end cover, adjust pad The drawing process Is the design process

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Chapter 14 assembly drawing § 9-5 drawing parts assembly drawing

Second, the method of draw assembly drawings 2. Outside-in: tolerance, such as painting shell according to draw the other parts assembly relationship gradually. For more on existing machine for surveying and mapping.

1. 2. Draw a body painting left end cover 4. Scrolls, pay attention to the cover illustration 3. Draw the left bearing 5. Draw the right end bearing and end cover, adjust pad

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Chapter 14 assembly drawing § 9-5 drawing parts assembly drawing

Three, draw assembly drawings of step 1. Determine the view, fixed proportion, map, draw the title bar, the sash schedule. 2. The reasonable layout, draw the view line 3. Draw assembly main parts (main) support 4. Draw assembly time main parts in (input and output lines) note: draw the big structure, draw the details; Especially keys, pins, threaded connections for the 5. Dimension, what size should be marked, can see the front surface is introduced. Beginners should note that not all feet "on the part drawing to move to the assembly drawing. 6. The serial number, fill in the table topic bar, sheet, technical requirements. 7. Carefully after full audit, then the signature, note on time.

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Chapter 14 assembly drawing § 9-6 by the assembly drawing parts drawing

One, understand the assembly drawing See assembly drawing should reach requirements: 1. Understand the component functions, working principle and performance. (2) clear position relations between parts and the assembly connection relationship. 3. Understand the shape of each part and the role of each structure. Two, understand the method of assembly drawing step 1. With a title bar, and schedule for the index, overview of the outline of the part. 2. Analysis of the view, find out the main view, and find out the relationship between the view again. 3. The emphasis on analyzing the relation between the parts and components assembly connection relationship. 4. Comprehensive analysis result, straightening out parts overall structure.

One, understand the requirements of assembly drawings

1. Product manuals and other data, know the name, use, performance and working principle; Combining product manuals and other data, combined with product manuals etc Know the name, use, performance and working principle; 2. Understand the structure, the relative position between the various parts, assembly relations and sequence of installation, etc.; Understanding structure, the structure of the relative position between the various parts, assembly and disassembly sequence, etc; 3. Figure out each part name, quantity, material, structure, shape and function. Find out the name of the each parts, find out the name of each part number, material, shape and function structure.

Second, the method and steps

The title bar, the title bar, understand the assembly analysis view understand parts list and specifications, understand the role of the parts, the shape and size of body parts analysis name, use, performance and working principle of name, use, performance and working principle, sums up the assembly relationship between summarizing Solutions for its complexity, the function of each parts. Solutions for its complexity, the role of each parts and so on.

Three, by the assembly drawing parts drawing Figure 1 by the assembly drawing draw down the parts separated parts separated parts - separated parts number, section line, the projection rule, serial number, section line, projection rule, drew the outline of the outline parts

Special attention should be paid to: note: what are the structure line is not to open his painting parts? The parts?

2. The analysis and the location of the other components, connections, assembly, repair paint obscured part and loading analysis and the location of the other components, analysis of the location of the connection with other parts, assembly relationship, with the structure of the figure is not clear; Select the appropriate parts view representation methods; The structure of the pictures are not clear; Select the appropriate parts view representation methods; A process structures of parts to design process. Process structure of the parts design process.

3. Draw detail drawings; Dimension and tolerance - the size of the existing and the direct copy, check for the dimensions of the manual to determine, in proportion to the size of the measuring and drawing parts figure; The size of the dimension and tolerance and the existing existing size directly copied directly Check for the dimensions of the manual to determine, in proportion to the size of the measuring and drawing parts drawing subject to calculate and determine the size. Subject to calculate and determine the size. 4. Technical requirements on the part drawing technical requirements on the part drawing, surface roughness, position tolerances, etc. The surface roughness, on the part drawing technical requirements The surface roughness shape tolerance, etc.

Draw down the part drawing methods and steps: 1, from the serial number, section line, view the relationship, isolated parts; 2, the analysis and the location of the other parts, connection, assembly relations, repair paint The structure of the pictures are not clear; 3, process structures of parts design; 4, to determine the expression way; 5, figure painting parts; 6, the dimension and tolerance - the size of the existing direct copy; The structure of the look-up table for standard gauge set; According to the proportion of directly measuring; Computational test important size; Completion of other size 7, technical requirements, refer to the related data; The surface roughness: bearing is above 1.6; Cooperate with the requirements of the surface of the relative motion above 3.2; No relative movement of the contact surface is 6.3; The contact surface under 6.3.

 

The working principle of butterfly-valve:

蝴蝶閥在管道上用來截斷氣流和液流的.當外力推動齒桿13 蝴蝶閥在管道上用來截斷氣流和液流的.當外力推動齒桿 齒桿 左右移動時,與齒桿嚙合的齒輪 帶動閥桿 旋轉, 閥門2開啟 齒輪10帶動閥桿3旋轉 左右移動時,與齒桿嚙合的齒輪 帶動閥桿 旋轉,使閥門 開啟 或關閉. 或關閉. 齒桿沿軸線作往復運動,緊定螺釘 的末端圓柱嵌入齒桿的 齒桿沿軸線作往復運動,緊定螺釘12的末端圓柱嵌入齒桿的 槽中,是為了防止齒桿發生轉動, 槽中,是為了防止齒桿發生轉動,以保證齒桿上的齒與齒輪正確 嚙合.圖中閥門是處于開啟位置,當齒桿向右移動時, 嚙合.圖中閥門是處于開啟位置,當齒桿向右移動時,使齒輪作 順時針旋轉,帶動閥桿旋轉,使閥門從開啟變為關閉位置. 順時針旋轉,帶動閥桿旋轉,使閥門從開啟變為關閉位置. 閥蓋11與閥體 的定位 的定位, 閥蓋 與閥體1的定位,主要靠閥蓋下端的圓柱凸臺嵌入閥 體的座孔中,其配合為間隙配合, 體的座孔中,其配合為間隙配合,以保證閥蓋與閥體上的閥桿孔 同心.而閥桿的軸向定位,是靠閥桿軸肩的上, 同心.而閥桿的軸向定位,是靠閥桿軸肩的上,下表面分別與閥 蓋及閥體上的圓柱凸臺,座孔的下端面接觸. 蓋及閥體上的圓柱凸臺,座孔的下端面接觸.為使這兩個端面不 致將閥桿上的軸肩壓得太死而無法活動,故用墊片 來調節. 墊片5來調節 致將閥桿上的軸肩壓得太死而無法活動,故用墊片 來調節.

The questions of reading

1. The cover and the body USES what is the mode of connection? What is the mode of connection of the valve cover and the body use? Bonnet and valve body by the 2. What is the mode of connection Numbers for what parts in the left view? Find it in the main view In the left view what Numbers for 2 parts What is in the left view Numbers for the parts? The corresponding projection. The corresponding projection. 3. The power by the gear lever to the valve? How is the power by the gear lever to the valve? How power by the gear lever to the valve 4. Remove stem, must according to what order? Remove stem, must according to what order? Remove stem 5. When combined with the valve cover and valve body, what is the shape? Combining the bonnet and valve body, what is the shape? Combined with the valve cover and valve body shape is how to 6. What is the shape of the valve body bumps on the bottom? What is the shape of the valve body bumps on the bottom? How the shape of the valve body bumps on the bottom of 7. Each note in the assembly drawing of size what kind? Note in the assembly drawing of various sizes what kind? Note in the assembly drawing of various sizes what kind

Operations understand the assembly drawing of a "butterfly-valve" draw down the valve body 1 and understand the assembly drawing of a "butterfly-valve" draw down the working drawing of the valve body and valve parts. Cover 11 working drawing of parts. The parts work.

 

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