Assembly device for round loading opening cover assembly

Abstract

An assembling device for a round loading opening cover assembly comprises a base assembly, positioning inserts and a bolt connecting base positioning plate assembly, the positioning inserts are arranged on the base assembly, and the center lines of the front positioning insert, the middle positioning insert and the rear positioning insert are located on the same straight line. Two sides of the middle positioning insert are provided with a folding vertical plate positioning groove composed of a round loading opening cover and a pin shaft hole connected with a folding vertical plate; the two ends of the bolt connecting base positioning plate assembly are detachably and fixedly connected with the middle positioning insert and the rear positioning insert respectively, the bolt connecting base positioning plate assembly comprises a positioning plate and a connecting base, the connecting base is detachably arranged above the positioning plate, and the positioning plate is provided with a clamping plate for positioning a bolt mounting base of the round loading opening cover assembly. According to the assembly device, all parts of the round loading opening cover assembly can be positioned, the assembly production efficiency and the assembly quality of the round loading opening cover assembly are improved, it is guaranteed that the consistency and interchangeability of workpieces are good, and the assembled round loading opening cover assembly is flexible to open and good in sealing performance.

Description

Technical field:

[0001] The invention relates to the technical field of tooling design and parts manufacturing, in particular to the technical field of manufacturing roof sealing parts of grain trucks, specifically, an assembly device composed of circular loading port covers. Background technology:

[0002] The circular loading port cover is a sealing component of the roof of a grain truck. The circular loading port cover comprises a circular loading port cover 2, a pressure plate 1, a folding plate 4, a bolt mounting seat 5 (such as Figure 1-Figure 5 As shown), an EPDM rubber sealing pad is installed on the bolt connection seat 5. The assembly quality of the circular loading port cover directly affects the loading and transportation of goods by the grain truck. If the sealing performance of the circular loading port cover is not good, water seepage will occur during use, affecting the safety of loading grain.

[0003] During the production and assembly of the circular loading port cover, a template is currently used to mark and assemble the various components of the circular loading port cover. The workpiece assembled by this method is easily affected by the operator's skill level, the assembly quality is unstable, the straightness of the two folding vertical plates and the center line of the pressure plate is difficult to ensure, and it is not flexible to open after assembly with the roof cover of the grain truck. Therefore, the consistency of the assembled workpiece is poor and the interchangeability is not strong. At the same time, there is a certain error in the plane on the bolt connection seat, which leads to poor sealing after the gasket is installed. Summary of the invention:

[0004] In view of the above problems, the present invention provides an assembling device for a circular loading port cover, which can improve the assembly and installation efficiency of the circular loading port cover. The workpieces after assembly have good consistency, and the straightness of the center lines of the pressure plate and the two folding uprights, the coaxiality of the pin shaft holes of the two folding uprights, and the flatness of the plane on the bolt mounting seat are effectively guaranteed.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] The present invention provides a device for assembling a circular loading port cover, the device comprising a base assembly, a positioning insert, and a bolt connection seat positioning plate assembly, the base assembly comprising a workbench and a support leg, the positioning insert comprising a front positioning insert, a side positioning insert, a middle positioning insert, and a rear positioning insert, each positioning insert being fixedly arranged on the base assembly, the center lines of the front positioning insert, the middle positioning insert, and the rear positioning insert being located on the same straight line; both sides of a raised structure in the middle of the middle positioning insert are provided with folding vertical plate positioning grooves, and a folding vertical plate positioning groove for connecting two folding vertical plates is provided on the raised structure The pin shaft hole of the plate, the top of the raised structure is vertically provided with a threaded through hole and a bolt hole for connecting the bolt connection seat positioning plate component; the middle part of the top of the rear positioning insert is provided with a placement groove for placing the pressure plate and the bolt connection seat positioning plate component; the side positioning insert is arranged on one side of the front positioning insert and the middle positioning insert; the two ends of the bolt connection seat positioning plate component are respectively detachably fixedly connected with the middle positioning insert and the rear positioning insert, the bolt connection seat positioning plate component includes a positioning plate and a connecting seat, the connecting seat is detachably arranged above the positioning plate, and a clamping plate for positioning the bolt mounting seat is arranged on the positioning plate.

[0007] The workbench formed by the base is a rectangular structure, and screw holes corresponding to the support legs are set at the four corners of the workbench, and the workbench and the support legs are connected by bolts; the front positioning insert, the middle positioning insert, and the rear positioning insert are located on a straight line and are located on the center line of the length direction of the rectangular workbench formed by the base.

[0008] The front positioning insert, side positioning insert, middle positioning insert and rear positioning insert are all provided with threaded holes corresponding to the workbench composed of the base, and the front positioning insert, side positioning insert, middle positioning insert and rear positioning insert are all detachably connected to the workbench composed of the base through bolts.

[0009] One side of the workbench composed of the base has four through holes symmetrically arranged at the circumferential position of the circular loading port cover, and the other side of the workbench composed of the base has a through hole corresponding to the flipped circular loading port cover to be assembled for placing the circular arch structure on the top of the circular loading port cover.

[0010] The front positioning insert is provided with a pressure plate mounting seat, and a bottom bending plate for placing the pressure plate and a through hole for the pressure plate mounting seat of the front positioning insert are provided on the workbench composed of the base and corresponding to the pressure plate mounting seat on the front positioning insert. The through hole is slightly larger than the size of the pressure plate mounting seat, and the pressure plate mounting seat on the front positioning insert is placed in the through hole.

[0011] The cross-section of the middle positioning insert is convex; the pin hole arranged on the raised structure in the middle of the middle positioning insert matches the pin hole of the folding vertical plate; the bolt hole arranged on the raised structure for connecting the bolt connection seat positioning plate component matches the size of the corresponding bolt hole of the bolt connection seat positioning plate component.

[0012] The placement groove on the top of the rear positioning insert matches the width of the pressure plate and the bolt connection seat positioning plate; threaded holes are arranged in the placement groove, which match the position and size of the corresponding bolt holes of the bolt connection seat positioning plate.

[0013] The distance between the side positioning insert and the midpoint between the front positioning insert and the middle positioning insert matches the radius of the circular loading port cover.

[0014] The positioning plate composed of the bolt connection seat positioning plate is in a circular ring shape, and 6 clamping plates for positioning the bolt mounting seat are evenly arranged around the circle; the connection seat composed of the bolt connection seat positioning plate is connected to the circular ring thread of the positioning plate through bolts.

[0015] The middle part of the connection seat composed of the bolt connection seat positioning plate is long and narrow, and the two ends are arc-shaped, which are staggered with the installation position of the bolt mounting seat; the two ends of the connection seat are respectively provided with screw holes matching the middle positioning insert and the rear positioning insert, and the two ends of the connection seat are respectively fixed on the middle positioning insert and the rear positioning insert by positioning pins.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can ensure that the center lines of the two folding upright plates of the circular loading port cover and the center line of the pressing plate are located on the same straight line.

[0018] 2. The present invention can ensure the coaxiality of the pin holes of the two folding upright plates.

[0019] 3. By adopting the present invention, the position accuracy of the bolt mounting seat can be guaranteed, and at the same time, the plane error on each bolt mounting seat is controlled within the tolerance range, which effectively ensures the flatness of the plane on the bolt mounting seat, and the sealing performance is guaranteed after the sealing gasket is assembled.

[0020] 4. The present invention can improve the production efficiency of the assembly and installation of the circular loading port cover.

[0021] In summary, the present invention is used to assemble and install the circular loading port cover assembly, so as to position the various components of the circular loading port cover assembly, improve the assembly production efficiency and assembly quality of the circular loading port cover assembly, and process a qualified circular loading port cover assembly to ensure the consistency of the workpieces after assembly and good interchangeability. The assembled circular loading port cover assembly is flexible to open and has good sealing performance. Description of the drawings:

[0022] Figure 1 It is a schematic diagram of the use state of the circular loading hatch cover;

[0023] Figure 2 A schematic diagram of a three-dimensional structure composed of a circular loading hatch cover (I);

[0024] Figure 3 A schematic diagram of the three-dimensional structure of the circular loading hatch cover (II);

[0025] Figure 4 A front view of a circular loading hatch;

[0026] Figure 5 for Figure 4 AA section view;

[0027] Figure 6-Figure 8 It is the front view, left view and right view of the present invention;

[0028] Fig. 9 A top view of the present invention;

[0029] Fig.10 for Fig. 9 AA section view;

[0030] Figure 11-13 The front view, left view and right view of the present invention in use;

[0031] Fig.14 It is a top view of the present invention in use;

[0032] Fig.15 for Fig.14 AA section view;

[0033] Fig.16 It is a schematic diagram of the circular loading port cover being turned over on the present invention;

[0034] Fig.17 This is a diagram showing the use state of the bolt connection seat positioning plate assembly of the present invention;

[0035] Fig.18 This is a front view of the bolt connection seat positioning plate assembly of the present invention;

[0036] Fig.19 It is a side view of the bolt connection seat positioning plate assembly of the present invention;

[0037] Fig. 20 A top view of the bolt connection seat positioning plate assembly of the present invention;

[0038] Fig.21 This is a schematic diagram of the bolt connection seat positioning plate component of the present invention being rotated at a certain angle;

[0039] Figure 22-Figure 24 It is a front view, a side view, and a top view of the front positioning insert in the present invention;

[0040] Figure 25-27 It is the front view, side view and top view of the central positioning insert in the present invention;

[0041] Figure 28-Figure 30 It is the front view, side view and top view of the rear positioning insert in the present invention;

[0042] Figure 31-Figure 32 It is the front view and top view of the side positioning insert in the present invention.

[0043] Reference numerals in the figures:

[0044] 1-pressing plate, 2-circular loading port cover, 3-partition, 4-folding vertical plate, 5-bolt mounting seat, 6-locating pin, 7-front positioning insert, 8-side positioning insert, 9-middle positioning insert, 10-bolt link seat positioning plate composition, 11-rear positioning insert, 12-base composition. Specific implementation method:

[0045] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0046] join Figure 1-Figure 5 In the prior art, the roof sealing component of the grain truck includes a circular loading port cover, which is composed of a circular loading port cover 2, a pressure plate 1, a folding plate 4, and a bolt mounting seat 5. The top of the circular loading port cover 2 is a circular arch structure, and the circular loading port cover 2 is bent downward in a circle. A pressure plate 1 is set on one side of the circular loading port cover 2, and two folding plates 4 are set on the other side. The center lines of the pressure plate 1 and the two folding plates 4 coincide, and six bolt mounting seats 5 are evenly set in a circle inside the circular arch structure of the circular loading port cover 2. The pressure plate 1 is bent, including a top bent plate, a bottom bent plate and an intermediate connecting plate. The top bent plate and the intermediate connecting plate are tightly attached to and fixed on the circular loading port cover 2, and the top bent plate is pressed on the circular loading port cover 2. Two folding plates 4 are arranged in parallel, and pin holes are arranged on the two folding plates 4 respectively, and a partition plate 3 is arranged between the two folding plates 4, and the folding plates 4 and the partition plate 3 are fixed on the other side of the circular loading port cover 2 opposite to the pressing plate 1. The production assembly of the circular loading port cover currently uses a sample marking assembly to assemble various parts, and the assembly method using this method has the problem of unstable assembly quality.

[0047] See also Figure 6-Figure 32In order to ensure the assembly quality of the circular loading port cover assembly, the present invention provides an assembly device for the circular loading port cover assembly, which is used to assemble and install the circular loading port cover assembly. The assembly device can improve the assembly production efficiency and assembly quality of the circular loading port cover assembly. The assembly device includes a base assembly 12, a positioning insert, and a bolt connection seat positioning plate assembly 10. The positioning insert includes a front positioning insert 7, a side positioning insert 8, a middle positioning insert 9, and a rear positioning insert 11. Each positioning insert is fixedly arranged on the base assembly 12.

[0048] The base component 12 includes a workbench and supporting legs. The workbench is a rectangular structure. The four corners of the workbench are provided with screw holes corresponding to the supporting legs. The workbench and the supporting legs are connected by bolts. The circular loading port cover 2 to be assembled is placed on one side of the workbench of the base component 12. Four through holes are symmetrically arranged at the circumferential position of the circular loading port cover 2 on one side of the workbench of the base component 12, which are used to adjust the position of the circular loading port cover 2 and facilitate the use of tools to move the circular loading port cover 2 for positioning; the other side of the workbench of the base component 12 corresponds to the flipped circular loading port cover 2 to be assembled, and a through hole for placing the circular arch structure on the top of the circular loading port cover 2 is arranged.

[0049] The center lines of the front positioning insert 7, the middle positioning insert 9, and the rear positioning insert 11 are located on a straight line and are located on the center line of the length direction of the rectangular workbench of the base component 12. The front positioning insert 7, the side positioning insert 8, the middle positioning insert 9, and the rear positioning insert 11 are all provided with threaded holes corresponding to the workbench of the base component 12, and the front positioning insert 7, the side positioning insert 8, the middle positioning insert 9, and the rear positioning insert 11 are all detachably connected to the workbench of the base component 12 by bolts.

[0050] The front positioning insert 7 is provided with a pressure plate mounting seat for placing and positioning the pressure plate 1. When in use, the bottom bent plate of the pressure plate 1 is tightly against the pressure plate mounting seat. A through hole for placing the bottom bent plate of the pressure plate 1 and the pressure plate mounting seat of the front positioning insert 7 is provided on the workbench of the base component 12, corresponding to the pressure plate mounting seat on the front positioning insert 7. The through hole is slightly larger than the size of the pressure plate mounting seat, and the pressure plate mounting seat on the front positioning insert 7 is placed in the through hole.

[0051] The cross section of the middle positioning insert 9 is a convex structure, and the two sides of the raised structure in the middle are provided with positioning grooves for the folding upright plates 4, and the raised structure is provided with a pin hole for connecting the two folding upright plates 4, which matches the pin hole of the folding upright plate 4. A threaded through hole is vertically arranged on the top of the raised structure in the middle of the middle positioning insert 9, and a bolt is passed through the threaded through hole to press the circular loading port cover 2 downward, and a bolt hole for connecting the bolt connection seat positioning plate assembly 10 is provided on the raised structure in the middle of the middle positioning insert 9, and the size of the bolt hole corresponding to the bolt connection seat positioning plate assembly 10 matches.

[0052] A placement groove is provided in the middle of the top of the rear positioning insert 11 for placing the pressure plate 1 and the bolt connection seat positioning plate assembly 10. The placement groove matches the width of the pressure plate 1 and the bolt connection seat positioning plate assembly 10. A threaded hole is provided in the placement groove, which matches the position and size of the bolt holes corresponding to the bolt connection seat positioning plate assembly 10.

[0053] The side positioning insert 8 is arranged on one side of the front positioning insert 7 and the middle positioning insert 9 , and the distance between the side positioning insert 8 and the midpoint between the front positioning insert 7 and the middle positioning insert 9 matches the radius of the circular loading port cover 2 .

[0054] The two ends of the bolt connection seat positioning plate component 10 are respectively detachably fixedly connected with the middle positioning insert 9 and the rear positioning insert 11. The bolt connection seat positioning plate component 10 includes a positioning plate and a connection seat. The positioning plate is annular, and 6 clamping plates for positioning the bolt mounting seat 5 are evenly arranged around the circle. A connection seat is arranged above the positioning plate, and the connection seat is threadedly connected with the circular ring of the positioning plate by bolts. The middle part of the connection seat is long and the two ends are arc-shaped, which are staggered with the installation position of the bolt mounting seat 5 to avoid the installation position of the bolt mounting seat 5, so as to facilitate the positioning and fixed installation of the bolt mounting seat 5. The two ends of the connection seat are respectively provided with screw holes matching the middle positioning insert 9 and the rear positioning insert 11, and the two ends of the connection seat are respectively fixed on the middle positioning insert 9 and the rear positioning insert 11 by positioning pins 6.

[0055] The alignment device ensures the straightness of the center line of the pressing plate 1 and the center line between the two folding upright plates 4 in the circular loading port cover assembly through the front positioning insert 7 and the middle positioning insert 9, and ensures the coaxiality between the pin holes of the two folding upright plates 4. The three positioning inserts, the front positioning insert 7, the middle positioning insert 9 and the side positioning insert 8, ensure the relative position between the circular loading port cover 2 and the pressing plate 1 and the folding upright plates 4. The alignment device ensures the relative position accuracy between the pressing plate 1, the circular loading port cover 2, the partition plate 3, the folding upright plates 4 and the bolt connection seat 5 through the middle positioning insert 9, the rear positioning insert 11, the bolt connection seat positioning plate assembly 10 and the positioning pin 6.

[0056] When the assembling device is used to assemble the circular loading port cover, the specific operation steps are as follows:

[0057] 1. Place the circular loading port cover 2 composed of the circular loading port cover on the workbench of the base component 12 of the device, and place the circular loading port cover 2 between the front positioning insert 7, the side positioning insert 8, and the middle positioning insert 9. After the position of the circular loading port cover 2 is determined, the pressure plate 1 composed of the circular loading port cover is installed by the gear group, and the top bent plate and the middle connecting plate of the pressure plate 1 are tightly attached to the circular loading port cover 2, and the bottom bent plate is placed on the pressure plate mounting seat of the front positioning insert 7 for positioning.

[0058] 2. Place the two circular loading port covers consisting of the folding upright plates 4 symmetrically in the positioning grooves on both sides of the middle positioning insert 9 of the device, insert the positioning pins into the pin holes of the two folding upright plates 4 and the middle positioning insert 9, and use the positioning pins to ensure the coaxiality between the pin holes on the two folding upright plates 4.

[0059] 3. Adjust the positions of the pressing plate 1 and the two folding upright plates 4, and ensure that the center line of the pressing plate 1 and the center line between the two folding upright plates 4 are in the same straight line through the front positioning insert 7 and the middle positioning insert 9. After the positions of the pressing plate 1 and the two folding upright plates 4 are positioned, bolts are passed through the top of the middle positioning insert 9 to press down on the circular loading port cover 2, and then the pressing plate 1 and the two folding upright plates 4 are installed, and the pressing plate 1 is welded and fixed to the circular loading port cover 2. A partition plate 3 is vertically arranged between the two folding upright plates 4 at one end of the circular loading port cover 2 and between the two folding upright plates 4, and the partition plate 3 and the two folding upright plates 4 are welded and fixed to the other side of the circular loading port cover 2 opposite to the pressing plate 1.

[0060] 4. Turn the circular loading port cover 2 180 degrees through the positioning pins installed between the two folding upright plates 4 and the middle positioning insert 9, and place the pressing plate 1 in the placement groove of the rear positioning insert 11.

[0061] 5. The two ends of the bolt connection seat positioning plate assembly 10 of the assembly are respectively fixed on the middle positioning insert 9 and the rear positioning insert 11 of the assembly, and the positioning pin 6 is installed into the pin holes corresponding to the bolt connection seat positioning plate assembly 10 and the middle positioning insert 9 and the rear positioning insert 11.

[0062] 6. The backstop group installs the bolt mounting seat 5 of the circular loading port cover assembly, and places the bolt mounting seat 5 in the corresponding clamping plate of the positioning plate of the bolt connection seat positioning plate assembly 10 to determine the installation position and horizontal plane height of the bolt mounting seat 5. After the installation position and horizontality of the bolt mounting seat 5 are determined, the bolt mounting seat 5 is welded and fixed at the designed position inside the circular loading port cover 2 to complete the assembly of all parts of the circular loading port cover assembly.

[0063] 7. After the parts of the circular loading port cover are assembled, take out the locating pins 6 at both ends of the bolt connection seat positioning plate assembly 10, rotate the bolt connection seat positioning plate assembly 10 by a certain angle, then take out the bolt connection seat positioning plate assembly 10, and then take out the locating pins installed between the folding vertical plate 4 and the middle positioning insert 9 and the bolts on the raised structure in the middle of the middle positioning insert 9 for pressing the circular loading port cover 2 downward.

Claims

1. A device for assembling circular loading hatches, characterized in that: The assembly device comprises a base component (12), a positioning insert, and a bolt connection seat positioning plate component (10). The base component (12) comprises a workbench and support legs. The positioning insert comprises a front positioning insert (7), a side positioning insert (8), a middle positioning insert (9), and a rear positioning insert (11). Each positioning insert is fixedly arranged on the base component (12). The center lines of the front positioning insert (7), the middle positioning insert (9), and the rear positioning insert (11) are located on the same straight line. The convex structure in the middle of the middle positioning insert (9) is provided with folding plate (4) positioning grooves on both sides. The convex structure is provided with a pin shaft hole for connecting the two folding plates (4). A threaded through hole and a bolt hole for connecting the bolt connection seat positioning plate component (10) are vertically arranged at the top of the structure; a placement groove for placing the pressure plate (1) and the bolt connection seat positioning plate component (10) is arranged in the middle of the top of the rear positioning insert (11); the side positioning insert (8) is arranged on one side of the front positioning insert (7) and the middle positioning insert (9); the two ends of the bolt connection seat positioning plate component (10) are respectively detachably fixedly connected to the middle positioning insert (9) and the rear positioning insert (11); the bolt connection seat positioning plate component (10) includes a positioning plate and a connection seat, the connection seat is detachably arranged above the positioning plate, and a clamping plate for positioning the bolt mounting seat (5) is arranged on the positioning plate.

2. The circular loading port cover assembly device according to claim 1, characterized in that: The workbench of the base component (12) is a rectangular structure, and screw holes corresponding to the support legs are arranged at the four corners of the workbench, and the workbench and the support legs are connected by bolts; the front positioning insert (7), the middle positioning insert (9), and the rear positioning insert (11) are located on a straight line and are located on the center line of the rectangular workbench of the base component (12) in the length direction.

3. The circular loading port cover assembly device according to claim 1, characterized in that: The front positioning insert (7), the side positioning insert (8), the middle positioning insert (9), and the rear positioning insert (11) are all provided with threaded holes corresponding to the workbench of the base component (12); the front positioning insert (7), the side positioning insert (8), the middle positioning insert (9), and the rear positioning insert (11) are all detachably connected to the workbench of the base component (12) by bolts.

4. The circular loading port cover assembly device according to claim 1, characterized in that: One side of the workbench of the base component (12) is provided with four through holes symmetrically arranged at positions corresponding to the circumference of the circular loading port cover (2), and the other side of the workbench of the base component (12) is provided with a through hole for placing the circular arch structure at the top of the circular loading port cover (2) corresponding to the turned circular loading port cover (2) to be assembled.

5. The circular loading port cover assembly device according to claim 1, characterized in that: The front positioning insert (7) is provided with a pressure plate mounting seat, and a through hole for placing the bottom bending plate of the pressure plate (1) and the pressure plate mounting seat of the front positioning insert (7) is provided on the workbench of the base component (12) corresponding to the pressure plate mounting seat on the front positioning insert (7), and the through hole is slightly larger than the size of the pressure plate mounting seat, and the pressure plate mounting seat on the front positioning insert (7) is placed in the through hole.

6. The circular loading port cover assembly device according to claim 1, characterized in that: The cross section of the middle positioning insert (9) is convex; the pin hole provided on the raised structure in the middle of the middle positioning insert (9) matches the pin hole of the folding vertical plate (4); the bolt hole provided on the raised structure for connecting the bolt connection seat positioning plate component (10) matches the size of the corresponding bolt hole of the bolt connection seat positioning plate component (10).

7. The circular loading port cover assembly device according to claim 1, characterized in that: The placement groove at the top of the rear positioning insert (11) matches the width of the pressure plate (1) and the bolt connection seat positioning plate component (10); a threaded hole is provided in the placement groove, which matches the position and size of the corresponding bolt hole of the bolt connection seat positioning plate component (10).

8. The circular loading port cover assembly device according to claim 1, characterized in that: The distance between the side positioning insert (8) and the midpoint between the front positioning insert (7) and the middle positioning insert (9) matches the radius of the circular loading port cover (2).

9. The circular loading port cover assembly device according to claim 1, characterized in that: The positioning plate of the bolt connection seat positioning plate assembly (10) is in the shape of a circular ring, and 6 clamping plates for positioning the bolt mounting seat (5) are evenly arranged around the circle; the connection seat of the bolt connection seat positioning plate assembly (10) is connected to the circular ring thread of the positioning plate through bolts.

10. The circular loading port cover assembly device according to claim 1, characterized in that: The middle part of the connection seat of the bolt connection seat positioning plate component (10) is long and narrow, and the two ends are arc-shaped, which are staggered with the installation position of the bolt mounting seat (5); the two ends of the connection seat are respectively provided with screw holes matching the middle positioning insert (9) and the rear positioning insert (11), and the two ends of the connection seat are respectively fixed on the middle positioning insert (9) and the rear positioning insert (11) by positioning pins (6).

Images