Rear axle boring tool

Abstract

The rear axle boring tool comprises a base and two clamping mechanisms oppositely installed on the upper portion of the base, each clamping mechanism comprises a first fixing seat installed on the upper portion of the base, a supporting piece installed on the upper portion of the first fixing seat and a first clamping piece, the first clamping piece is installed on one side of the supporting piece, and the first clamping piece is installed on the other side of the supporting piece. The fixing device is used for fixing a mounting plate on the axle shaft sleeve to a supporting piece. When the rear axle boring tool is used, a to-be-machined axle shaft sleeve of a rear axle is placed on the base, the mounting plate on the axle shaft sleeve is placed at the position of the supporting piece, the mounting plate is fixed to the supporting piece through the first clamping piece, it is guaranteed that the axle shaft sleeve is evenly clamped, then boring operation can be started, and after boring is completed, the mounting plate is fixed to the supporting piece through the second clamping piece. And the clamping mechanism is loosened, and the machined axle shaft sleeve is taken out, so that the machining precision and efficiency are improved, and the operation safety and reliability are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of rear axle boring processing, in particular to a rear axle boring tool. Background Art

[0002] At present, the rear axle of the automobile includes a bridge housing, axle sleeves at both ends of the bridge housing, and a mounting plate on the axle sleeves, as shown in the attached figure. Figure 1 As shown, during the processing and manufacturing of the rear axle, the bridge housing needs to be bored to form a housing cavity for accommodating the power transmission component, so a fixture needs to be used to clamp and position it during the boring process.

[0003] The traditional clamping and positioning method generally adopts manual positioning. In the actual operation process, the clamping conditions of the rear axle are different due to different personnel, which can easily lead to poor boring accuracy and low yield. In addition, manual clamping and loosening not only increases the workload of workers, but also poses risks. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a rear axle boring tool to solve the problem that the clamping positioning method using manual positioning in the prior art will result in different clamping conditions of the rear axle due to different personnel, which will easily lead to poor boring accuracy and low yield. In addition, manual clamping and loosening not only increases the workload of personnel, but also poses a dangerous technical problem.

[0005] The utility model provides a rear axle boring tool, comprising a base and two clamping mechanisms mounted on the upper part of the base facing each other, wherein each of the clamping mechanisms comprises a first fixing seat mounted on the upper part of the base, a support member mounted on the upper part of the first fixing seat, and a first clamping member, wherein the first clamping member is mounted on one side of the support member and is used to fix the mounting plate on the half-axle sleeve to the support member.

[0006] Furthermore, the support members each include a support block fixedly mounted on the upper portion of the first fixing seat, and a support groove is provided on the upper portion of the support block.

[0007] Furthermore, the first clamping member includes a first driving component installed on the upper part of the first fixed seat, a driving end of which one end is rotatably connected to the first driving component, a support arm and a rocker arm of which the other end is rotatably connected to the first pressure block. One end of the rocker arm is rotatably connected to the middle part of the support arm, and the other end is rotatably connected to the support block, so as to drive the support arm to move up and down under the action of the first driving component, so that the first pressure block abuts against or separates from the upper part of the mounting plate on the half-axle sleeve.

[0008] Furthermore, the support groove is wedge-shaped and pads are installed on both inner walls facing each other, so that when the first pressing block abuts against the mounting plate on the half-axle sleeve, the mounting plate abuts between the two pads.

[0009] Furthermore, a limiting block is installed on the side wall of one of the support blocks of the two support members, and a limiting pin is installed on the limiting block for laterally blocking and limiting a mounting plate on the half-axle sleeve.

[0010] Furthermore, it also includes a second clamping member installed between the two first clamping members, the second clamping member includes a second fixed seat installed on the upper part of the base, two fixed plates installed facing each other on the upper part of the second fixed seat, a fixed rod installed horizontally between the two fixed plates, two clamping arms rotatably connected to the fixed rod in the middle, and a second driving component rotatably connected to one end of one of the clamping arms; wherein a second pressure block is rotatably installed at one end of the two clamping arms to drive the clamping arms to move left and right under the action of the second driving component, so that the second pressure block abuts against or separates the outer surface of the half-axle sleeve.

[0011] Furthermore, it also includes a positioning member, which includes a third fixed seat, a pull rod slidably installed on the third fixed seat, and a limit rod, one end of the limit rod is installed on one end of the pull rod, so that the limit rod is driven to abut against the processed end surface of the bridge housing by moving the pull rod, so that its processed end surface is perpendicular to the base.

[0012] Furthermore, a mounting groove is provided at the bottom of the third fixing seat, a positioning sleeve is installed in the mounting groove, and the pull rod is slidably installed in the positioning sleeve.

[0013] Furthermore, a handle is installed at the end of the pull rod away from the limiting rod, a bushing is provided between the handle and the positioning sleeve, the bushing is sleeved on the outer surface of the pull rod, and a spring is also provided between the handle and the bushing, the spring is sleeved on the outer surface of the pull rod.

[0014] Furthermore, a vertical plate is installed on the upper part of the third fixing seat, and two mounting sleeves are installed on the vertical plate. The mounting sleeves are used to install limit pins, and the limit pins are used to abut against the rear end surface of the bridge housing.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The rear axle boring tool of the present invention is used to place the half-axle sleeve of the rear axle to be processed on the base, so that the mounting plate on the half-axle sleeve is placed on the position of the support member, and the mounting plate is fixed to the support member by the first clamping member to ensure that the half-axle sleeve is evenly clamped. Then the boring operation can be started. After the boring is completed, the clamping mechanism is released and the processed half-axle sleeve is taken out, which not only improves the processing accuracy and efficiency, but also enhances the safety and reliability of the operation.

[0017] The rear axle boring tool of the utility model enhances the stability of the entire tool system and reduces vibration and displacement during the axle housing processing process through the coordinated work of the first clamping piece and the second clamping piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the rear axle in the prior art;

[0019] Figure 2 This is a structural schematic diagram of a rear axle boring tool for processing a rear axle according to an embodiment of the utility model;

[0020] Figure 3 This is a structural diagram of a rear axle boring tool according to an embodiment of the present utility model;

[0021] Figure 4 This is a schematic structural diagram of a support member in a rear axle boring tool according to an embodiment of the present utility model;

[0022] Figure 5 This is a structural schematic diagram of the first clamping member in the rear axle boring tooling according to one embodiment of the present utility model;

[0023] Figure 6 This is a structural schematic diagram of the second clamping member in the rear axle boring tooling according to one embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the positioning member in the rear axle boring tooling of the utility model. Figure 1 ;

[0025] Figure 8 This is a schematic diagram of the structure of the positioning member in the rear axle boring tooling of the utility model. Figure 2 ;

[0026] Description of Figure Numbers:

[0027] 10. Rear axle; 11. Axle housing; 13. Axle bushing; 14. Mounting plate;

[0028] 20. Base; 30. First fixing seat;

[0029] 40. Support member; 41. Support block; 411. Support groove; 42. Spacer block; 43. Limit block; 44. Limit pin;

[0030] 50. First clamping member; 51. First driving member; 52. Support arm; 53. Rocker arm; 54. First pressing block;

[0031] 60. Second clamping member; 61. Second fixing seat; 62. Fixing plate; 63. Fixing rod; 64. Clamping arm; 65. Second driving member; 66. Second pressing block; 661. Wedge-shaped pressing groove;

[0032] 70. Positioning member; 71. Third fixing seat; 711. Mounting slot; 72. Pull rod; 73. Limit rod; 74. Positioning sleeve; 75. Handle; 76. Bushing; 77. Spring; 78. Vertical plate; 79. Mounting sleeve.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and beneficial effects of the present invention more clearly understood, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] In the description of the present invention, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of the present specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by those familiar with the technology, and are not intended to limit the applicable conditions of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle", and "one" cited in the present specification are only for the convenience of description and are not intended to limit the applicable scope of the present invention. Changes or adjustments in their relative relationships should also be considered as the applicable scope of the present invention without substantially changing the technical content.

[0036] like Figure 1-3 As shown, an embodiment of the present invention provides a rear axle boring tool, including a base 20 and two clamping mechanisms installed opposite to each other on the upper part of the base 20, wherein each of the clamping mechanisms includes a first fixed seat 30 installed on the upper part of the base 20, a support member 40 installed on the upper part of the first fixed seat 30, and a first clamping member 50, wherein the first clamping member 50 is installed on one side of the support member 40, and is used to fix the mounting plate 14 on the half-axle sleeve 13 on the support member 40, so as to ensure that the position of the half-axle sleeve 13 is stable during the processing, thereby improving the accuracy of the boring of the bridge housing 11.

[0037] In the embodiment of the utility model, when in use, the half-axle sleeve 13 of the rear axle 10 to be processed is placed on the base 20, the mounting plate 14 on the half-axle sleeve 13 is placed at the position of the support 40, and the mounting plate 14 is fixed to the support 40 by the first clamping member 50 to ensure that the half-axle sleeve 13 is evenly clamped, and then the boring operation can be started. After the boring is completed, the clamping mechanism is released and the processed half-axle sleeve 13 is taken out, which not only improves the processing accuracy and efficiency, but also enhances the safety and reliability of the operation.

[0038] Specifically, such as Figure 4 As shown, in the embodiment of the present invention, the support members 40 include a support block 41 fixedly mounted on the upper portion of the first fixed seat 30, and a support groove 411 is provided on the upper portion of the support block 41. The support groove 411 and the support block 41 provide stable support to prevent the half-axle sleeve 13 from moving or offsetting during the processing.

[0039] Specifically, such as Figure 5 As shown, in the embodiment of the present utility model, the first clamping member 50 includes a first driving component 51 installed on the upper part of the first fixed seat 30, a driving end of the first driving component 51 rotatably connected at one end, a support arm 52 with a first pressure block 54 rotatably connected at the other end, and a rocker arm 53. One end of the rocker arm 53 is rotatably connected to the middle part of the support arm 52, and the other end is rotatably connected to the support block 41, so as to drive the support arm 52 to move up and down under the action of the first driving component 51, so that the first pressure block 54 abuts against or separates the upper part of the mounting plate 14 on the half-shaft sleeve 13. That is, through the coordinated action of the driving component, the support arm 52, the rocker arm 53 and the first pressure block 54, the mounting plate 14 can be accurately clamped, the clamping error is reduced, and the first pressure block 54 directly acts on the mounting plate 14, providing a stable clamping force, preventing the half-shaft sleeve 13 from moving or offsetting during the processing, and the entire clamping process can be automated by controlling the first driving component 51, which simplifies the operation steps and improves work efficiency.

[0040] During specific operation, the first driving component 51 (such as a conventional linear driving device such as a cylinder, hydraulic cylinder or motor) is started, and one end of the support arm 52 is driven to move up and down through the driving end. The other end of the support arm 52 is connected to the first pressure block 54. When the support arm 52 moves up and down, the first pressure block 54 will move up and down accordingly. One end of the rocker arm 53 is rotated to connect to the middle part of the support arm 52, and the other end is rotated to connect to the support block 41; when the support arm 52 moves up and down, the rocker arm 53 will act as a lever, so that the first pressure block 54 can more smoothly abut or separate from the mounting plate 14. When the first pressure block 54 moves downward, it will press the mounting plate 14, thereby firmly fixing the half-axle sleeve 13 on the support block 41, ensuring that the half-axle sleeve 13 is evenly clamped and the position is accurate.

[0041] Based on the above scheme, if Figure 4 As shown, in the embodiment of the present invention, the support groove 411 is wedge-shaped and pads 42 are installed on both opposing inner walls, so that when the first pressure block 54 abuts against the mounting plate 14 on the half-axle sleeve 13, the mounting plate 14 abuts between the two pads 42. Since the pad 42 is installed on the inner wall of the wedge-shaped support groove 411, when the first pressure block 54 presses the mounting plate 14, the mounting plate 14 will be evenly squeezed between the two pads 42, which can ensure that the clamping force is evenly distributed on the entire mounting plate 14, avoiding deformation or damage caused by uneven pressure, and the mounting plate 14 will automatically adjust to the most suitable clamping position under the action of the clamping force. In addition, by adjusting the thickness of the pad 42 or using an adjustable pad 42, it is possible to adapt to mounting plates 14 of different sizes to meet the boring processing requirements of the bridge housing 11.

[0042] The pad 42 is made of a softer material (such as rubber, plastic or other flexible materials) and can act as a buffer during the clamping process to prevent hard contact from causing scratches or damage to the surface of the mounting plate 14.

[0043] Based on the above scheme, if Figure 4 As shown, in an embodiment of the present invention, a limit block 43 is installed on the side wall of one of the support blocks 41 of the two support members 40, and a limit pin 44 is installed on the limit block 43, which is used to laterally block and limit a mounting plate 14 on the half-axle sleeve 13. By pre-setting the position of the limit pin 44, the operator can quickly and accurately place the mounting plate 14 in place without the need for manual positioning by the operator, thereby reducing adjustment time and improving work efficiency.

[0044] During the specific work, the half-axle sleeve 13 of the rear axle 10 to be processed is placed on the base 20, and the mounting plate 14 on the half-axle sleeve 13 is aligned with the wedge-shaped support groove 411 and placed in the wedge-shaped support groove 411 to ensure that the mounting plate 14 is tightly fitted with the support groove 411. At the same time, the position of the mounting plate 14 is adjusted so that one side of it is laterally blocked by the limit pin 44 on the limit block 43 to limit the mounting plate 14 in the lateral direction so that the processed end face of the bridge housing 11 matches the machining center of the boring hole.

[0045] Based on the above scheme, if Figure 6As shown, in the embodiment of the present invention, it also includes a second clamping member 60 installed between the two first clamping members 50, and the second clamping member 60 includes a second fixed seat 61 installed on the upper part of the base 20, two fixed plates 62 installed opposite to each other on the upper part of the second fixed seat 61, a fixed rod 63 installed horizontally between the two fixed plates 62, two clamping arms 64 rotatably connected to the fixed rod 63 in the middle, and a second driving component 65 rotatably connected to one end of one of the clamping arms 64; wherein one end of the two clamping arms 64 is rotatably installed with a second pressure block 66, so that under the action of the second driving component 65, the clamping arms 64 are driven to move left and right, so that the second pressure block 66 abuts against or separates the outer surface of the half-axle sleeve 13, and the coordinated work of the second clamping member 60 and the first clamping member 50 enhances the stability of the entire tooling system and reduces the vibration and displacement during the processing of the bridge housing 11.

[0046] During specific operation, the second driving component 65 (such as a conventional linear device such as a cylinder, hydraulic cylinder or motor) is started, and the second driving component 65 drives the clamping arm 64 connected to it to move left and right, so that the second pressure block 66 abuts the outer surface of the half-shaft sleeve 13, and at the same time pushes the half-shaft sleeve 13 against the second pressure block 66 of the other clamping arm 64, thereby clamping the two ends of the half-shaft sleeve 13 from the side, and cooperating with the first clamping member 50 to ensure that the half-shaft sleeve 13 is firmly clamped and positioned in the longitudinal and transverse directions.

[0047] Specifically, such as Figure 6 As shown, in an embodiment of the present invention, the second pressure block 66 is provided with a wedge-shaped pressure groove 661. The design of the wedge-shaped pressure groove 661 can make the second pressure block 66 fit better with the outer surface of the half-shaft sleeve 13. When the second driving component 65 pushes the clamping arm 64 to make the second pressure block 66 approach and press the half-shaft sleeve 13, the wedge-shaped pressure groove 661 can guide the half-shaft sleeve 13 into the optimal clamping position, thereby providing a more stable clamping force, and at the same time evenly distribute the clamping force on the outer surface of the half-shaft sleeve 13, reducing local stress concentration and avoiding deformation or damage caused by uneven pressure. In addition, the wedge-shaped pressure groove 661 can also adapt to half-shaft sleeves 13 of different diameters to a certain extent. By adjusting the stroke of the second driving component 65, it can be ensured that half-shaft sleeves 13 of different sizes can be firmly and evenly clamped, thereby improving practicality.

[0048] Based on the above scheme, if Figure 7-8 As shown, in an embodiment of the present invention, a positioning member 70 is also included, and the positioning member 70 includes a third fixed seat 71, a pull rod 72 slidably installed on the third fixed seat 71, and a limit rod 73. One end of the limit rod 73 is installed on one end of the pull rod 72, so that the limit rod 73 is driven to abut against the processed end surface of the bridge housing 11 by moving the pull rod 72, so that its processed end surface is perpendicular to the base 20.

[0049] During the specific work, the half-axle sleeve 13 of the rear axle 10 to be processed is placed on the base 20, and the mounting plate 14 on the half-axle sleeve 13 is placed at the position of the support 40. Then the pull rod 72 is moved so that one end of the limit rod 73 abuts against the processed end surface of the bridge housing 11, that is, the processing end surface of the bridge housing 11 is made perpendicular to the base 20 through the pull rod 72, thereby improving the processing accuracy of the boring. Then, it is clamped and fixed by the first clamping member 50 and the second clamping member 60. After clamping and fixing, the pull rod 72 is moved and rotated so that the limit rod 73 is not in the processing end surface area of the bridge housing 11, and then the boring processing can be carried out.

[0050] Specifically, such as Figure 7-8 As shown, in the embodiment of the present utility model, an installation groove 711 is provided at the bottom of the third fixed seat 71, a positioning sleeve 74 is installed in the installation groove 711, and the pull rod 72 is slidably installed in the positioning sleeve 74. By sliding the pull rod 72 in the positioning sleeve 74, the shaking and vibration of the pull rod 72 during the movement can be reduced, making the sliding of the pull rod 72 smoother, reducing the jamming phenomenon, and improving the operating efficiency.

[0051] Based on the above scheme, if Figure 2 As shown, in the embodiment of the present utility model, a handle 75 is installed at the end of the pull rod 72 away from the limit rod 73, and a bushing 76 is provided between the handle 75 and the positioning sleeve 74. The bushing 76 is sleeved on the outer surface of the pull rod 72, and a spring 77 is also provided between the handle 75 and the bushing 76. The spring 77 is sleeved on the outer surface of the pull rod 72. The spring 77 is used to automatically abut the machined end surface of the bridge housing 11 to improve its stability. At the same time, when the positioning is completed, the pull rod 72 can reset itself.

[0052] During specific operation, by pushing and rotating the pull rod 72, one end of the limit rod 73 is located on the processed end surface area of the bridge housing 11. At this time, the spring 77 is in a compressed state, and then it is released. The limit rod 73 automatically rests on the processed end surface of the bridge housing 11 under the action of the spring 77, so that the processed end surface of the bridge housing 11 is perpendicular to the base 20, which is convenient for subsequent boring processing and improves processing accuracy. It is then clamped and fixed by the first clamping member 50 and the second clamping member 60. After clamping and fixing, push and rotate the pull rod 72 again so that the limit rod 73 is not in the processed end surface area of the bridge housing 11. The limit rod 73 can then rest on the side wall of the third fixing seat 71 under the action of the spring 77 to avoid affecting the subsequent boring processing.

[0053] Based on the above scheme, if Figure 7-8As shown, in the embodiment of the present utility model, a vertical plate 78 is installed on the upper part of the third fixed seat 71, and two mounting sleeves 79 are installed on the vertical plate 78. The mounting sleeves 79 are used to install elastic pins (not shown in the figure). The elastic pins are used to abut against the rear end surface of the bridge housing 11. Through the contact between the elastic pins and the rear end surface of the bridge housing 11, the bridge housing 11 can be prevented from moving during the processing, thereby enhancing the overall stability.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A rear axle boring tool, characterized in that: The invention comprises a base (20) and two clamping mechanisms mounted on the upper part of the base (20) facing each other, wherein each of the clamping mechanisms comprises a first fixing seat (30) mounted on the upper part of the base (20), a support member (40) mounted on the upper part of the first fixing seat (30), and a first clamping member (50), wherein the first clamping member (50) is mounted on one side of the support member (40) and is used to fix the mounting plate (14) on the half-axle sleeve (13) on the support member (40).

2. The rear axle boring tool according to claim 1, characterized in that: The supporting members (40) each comprise a supporting block (41) fixedly mounted on the upper portion of the first fixing seat (30), and a supporting groove (411) is provided on the upper portion of the supporting block (41).

3. The rear axle boring tool as claimed in claim 2, characterized in that: The first clamping member (50) includes a first driving component (51) mounted on the upper portion of the first fixing seat (30), a driving end rotatably connected to the first driving component (51), a support arm (52) rotatably connected to a first pressing block (54) at the other end, and a rocker arm (53), one end of the rocker arm (53) being rotatably connected to the middle portion of the support arm (52), and the other end being rotatably connected to the support block (41), so as to drive the support arm (52) to move up and down under the action of the first driving component (51), so that the first pressing block (54) abuts against or separates from the upper portion of the mounting plate (14) on the half-axle sleeve (13).

4. The rear axle boring tool as claimed in claim 3, characterized in that: The support groove (411) is wedge-shaped and has pads (42) installed on both opposing inner walls, so that when the first pressing block (54) abuts against the mounting plate (14) on the half-axle sleeve (13), the mounting plate (14) abuts between the two pads (42).

5. The rear axle boring tool as claimed in claim 2, characterized in that: A limiting block (43) is installed on the side wall of one of the support blocks (41) of the two support members (40), and a limiting pin (44) is installed on the limiting block (43) for laterally blocking and limiting a mounting plate (14) on the half-axle sleeve (13).

6. A rear axle boring tool as claimed in any one of claims 1 to 5, characterized in that: The invention also includes a second clamping member (60) installed between the two first clamping members (50), wherein the second clamping member (60) includes a second fixed seat (61) installed on the upper part of the base (20), two fixed plates (62) installed facing each other on the upper part of the second fixed seat (61), a fixed rod (63) installed horizontally between the two fixed plates (62), two clamping arms (64) rotatably connected to the fixed rod (63) in the middle, and a second driving component (65) rotatably connected to one end of one of the clamping arms (64); wherein a second pressing block (66) is rotatably installed at one end of each of the two clamping arms (64), so that under the action of the second driving component (65), the clamping arms (64) are driven to move left and right, so that the second pressing block (66) abuts against or separates the outer surface of the half-axle sleeve (13).

7. The rear axle boring tool as claimed in claim 6, characterized in that: It also includes a positioning member (70), which includes a third fixed seat (71), a pull rod (72) slidably mounted on the third fixed seat (71), and a limit rod (73), one end of the limit rod (73) is mounted on one end of the pull rod (72), so that the limit rod (73) is driven to abut against the processed end surface of the bridge housing (11) by moving the pull rod (72), so that the processed end surface is perpendicular to the base (20).

8. The rear axle boring tool as claimed in claim 7, characterized in that: The bottom of the third fixing seat (71) is provided with a mounting groove (711), a positioning sleeve (74) is installed in the mounting groove (711), and the pull rod (72) is slidably installed in the positioning sleeve (74).

9. The rear axle boring tool as claimed in claim 8, characterized in that: A handle (75) is installed at one end of the pull rod (72) away from the limiting rod (73), a bushing (76) is provided between the handle (75) and the positioning sleeve (74), and the bushing (76) is sleeved on the outer surface of the pull rod (72), and a spring (77) is also provided between the handle (75) and the bushing (76), and the spring (77) is sleeved on the outer surface of the pull rod (72).

10. A rear axle boring tool as claimed in any one of claims 7 to 9, characterized in that: A vertical plate (78) is installed on the upper portion of the third fixing seat (71), and two mounting sleeves (79) are installed on the vertical plate (78). The mounting sleeves (79) are used to install a limit pin (44), and the limit pin (44) is used to abut against the rear end surface of the bridge housing (11).

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