Automatic machining device for automobile auxiliary frame

Abstract

The utility model provides an automatic processing device for an automobile auxiliary frame, which belongs to the technical field of auxiliary frame processing, and comprises a mounting frame, a mounting component, an automatic processing device, an automatic processing device and a control device, and is characterized in that the mounting component comprises a horizontal limiting chute arranged on the inner wall of the mounting frame, a vertical limiting chute arranged on the inner wall of the mounting frame and a motor cabin arranged on the outer wall of the mounting frame; the motor bin, the horizontal limiting sliding groove and the vertical limiting sliding groove are symmetrically distributed about the central axis of the mounting frame. The positioning assembly is arranged in the horizontal limiting sliding groove; the punching assembly is arranged outside the positioning assembly; the inclination angle assembly is arranged outside the mounting frame; and the fixing assembly is arranged in the inclination angle assembly. Compared with the prior art, the automobile auxiliary frame clamping device can fix and clamp automobile auxiliary frames of different models and the same model and different sizes, meanwhile, the fixing posture of the automobile auxiliary frame can be adjusted so as to adapt to machining of different angles, the application range is expanded, and the machining diversity and flexibility are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary frame processing, in particular to an automatic processing device for an automobile auxiliary frame. Background Art

[0002] The front subframe of a car is a very important structural component in the chassis system. Its main function is to connect the front axle and the body, and to bear and transmit loads. The frame subframe is usually composed of a pair of longitudinal beams, a cross beam, and a Yuanbao beam. The longitudinal beams are welded from upper and lower beam plates. Mounting holes are provided at the front and rear ends of the longitudinal beams for fixing bolts and shock-absorbing bushings.

[0003] After searching, in the prior art, Chinese patent application number 202221314649.7 discloses an automatic processing device for an automobile subframe, comprising: a base plate, a pair of first fixing frames and a pair of second fixing frames fixedly connected to the top of the base plate, a bidirectional screw rod rotatably connected between the pair of first fixing frames, support assemblies threadedly connected to the threads at both ends of the bidirectional screw rod, and the support assemblies are used to support the punching positions at both ends of the longitudinal beam, and a guide rod is fixedly connected between the pair of first fixing frames. However, the following defects still exist:

[0004] (1) In the above patent document, the longitudinal beam on the front subframe of the automobile is fixed by fixing pins and limit blocks to achieve the fixation of the entire front subframe of the automobile. However, the existing support assembly can only provide fixed support in the vertical direction and cannot adapt to the fixation requirements at different angles. When the front subframe of a specific model of automobile needs to be tilted or rotated for processing, the device cannot provide corresponding support, which limits its adaptability to stamping plates of different shapes.

[0005] (2) In the above patent document, a drilling machine is used to drill holes in the front subframe of an automobile. However, the existing drilling machine cannot achieve inclined or bevel drilling of the workpiece, and cannot meet the processing requirements of the front subframe of an automobile of a specific model or special shape, thus limiting the diversity and flexibility of the processing.

[0006] Therefore, we have made improvements to this problem and proposed an automatic processing device for automobile subframes. Utility Model Content

[0007] The purpose of the utility model is to address the current problem of using fixing pins and limiting blocks to limit and fix the longitudinal beams on the front subframe of an automobile, thereby fixing the entire front subframe of the automobile. However, the existing support assembly can only provide fixed support in the vertical direction and cannot adapt to the fixing requirements at different angles. When it is necessary to tilt or rotate the front subframe of a specific model of automobile for processing, the device cannot provide corresponding support, which limits its adaptability to stamping plates of different shapes. When a drilling machine is used to drill holes in the front subframe of an automobile, the existing drilling machine cannot achieve tilting or oblique drilling of the workpiece, cannot meet the processing requirements of the front subframe of an automobile of a specific model or special shape, and limits the diversity and flexibility of processing.

[0008] In order to achieve the above-mentioned purpose of the utility model, the utility model provides the following technical solutions:

[0009] An automatic processing device for an automobile subframe, including an automatic processing device for an automobile subframe, including a mounting frame, and also including:

[0010] A mounting assembly for fixing the main functional components of the connecting device, wherein the mounting assembly includes a horizontal limiting slide groove provided on the inner wall of the mounting frame, a vertical limiting slide groove provided on the inner wall of the mounting frame, and a motor compartment provided on the outer wall of the mounting frame, wherein the motor compartment, the horizontal limiting slide groove, and the vertical limiting slide groove are symmetrically distributed about the central axis of the mounting frame;

[0011] The positioning component is arranged inside the horizontal limit slide and is used to locate the punching point on the vehicle subframe;

[0012] A punching assembly is provided outside the positioning assembly and is used to punch holes in the automobile subframe;

[0013] The inclination component is arranged outside the mounting frame and is used to adjust the inclination angle and processing posture of the automobile subframe;

[0014] The fixing assembly is arranged inside the tilt assembly and is used to fix subframes of different models and sizes.

[0015] As an optimal technical solution of the present invention, the positioning assembly includes a positioning frame slidably connected to the inner wall of the horizontal limit slide, a positioning hydraulic cylinder rotatably connected to the outer wall of the mounting frame, a positioning slide opened on the inner wall of the positioning frame, a rack fixedly connected to the outer wall of the positioning frame, a positioning seat slidably connected to the inner wall of the positioning slide, a positioning motor fixedly connected to the outer wall of the positioning seat, and a gear fixedly connected to the output end of the positioning motor. The positioning hydraulic cylinders are symmetrically distributed about the central axis of the mounting frame, and the positioning hydraulic cylinders cooperate with each other to push the positioning frame to move along the extension direction of the horizontal limit slide rail. The positioning slide, rack, positioning seat and positioning motor are distributed in pairs about the central axis of the positioning frame, and the gear is meshed with the rack.

[0016] As an optimal technical solution of the present invention, the punching assembly includes a lifting seat slidably connected to the inner wall of the positioning frame, a lifting hydraulic cylinder fixedly connected to the inner wall of the positioning frame, a stabilizing frame detachably connected to the top wall of the lifting seat below the positioning frame, a motor bracket detachably connected to the top wall of the lifting seat above the positioning frame, and a drilling machine fixedly connected to the inner wall of the motor bracket. The lifting hydraulic cylinders above and below the positioning frame push the lifting seats close to each other.

[0017] As an optimal technical solution of the present invention, the inclination assembly includes a lifting motor fixedly connected to the inner wall of the motor compartment, a lifting screw fixedly connected to the output end of the lifting motor, a threaded sleeve threadedly connected to the outer wall of the lifting screw, an adapter rotatably connected to the outer wall of the threaded sleeve, a bearing arm rotatably connected to the outer wall of the adapter, a steering hydraulic cylinder rotatably connected to the outer wall of the threaded sleeve, and a inclination hydraulic cylinder rotatably connected to the outer wall of the threaded sleeve, the threaded sleeve extends toward the outer wall of the mounting frame through a vertical limiting slot, the steering hydraulic cylinder pushes the adapter to rotate in a horizontal direction relative to the threaded sleeve, and the inclination hydraulic cylinder pushes the bearing arm to rotate in a vertical direction relative to the adapter.

[0018] As an optimal technical solution of the present invention, the fixing assembly includes a servo motor fixedly connected to the inner wall of the carrying arm, a displacement screw fixedly connected to the output end of the servo motor, a telescopic arm slidably connected to the inner wall of the carrying arm, and a fixed column head rotatably connected to the end of the telescopic arm, and the telescopic arm is threadedly engaged with the displacement screw.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the solution of the present utility model:

[0021] 1. The threaded sleeve is driven by the provided lifting motor and lifting screw to move along the inner wall of the vertical limit slide groove, so that all the threaded sleeves are at the same horizontal height, and the steering hydraulic cylinder is controlled to push the load-bearing arm to rotate to a specified angle about the adapter seat. At the same time, the servo motor and the displacement screw are controlled to drive the telescopic arm to move along the inner wall of the load-bearing arm so that the position of the fixed column head corresponds to the mounting hole position on the automobile subframe. The mounting hole is fixed with the sleeve between the fixed column head to achieve the fixation of automobile subframes of different sizes and models, and solves the problem of limiting and fixing the longitudinal beam on the front subframe of the automobile by fixing pins and limit blocks in the prior art to achieve the fixation of the entire front subframe of the automobile. However, the existing support assembly can only provide fixed support in the vertical direction and cannot adapt to the fixation requirements of different angles. When the front subframe of a specific model of automobile needs to be tilted or rotated for processing, the device cannot provide corresponding support, which limits its adaptability to stamping plates of different shapes.

[0022] 2. The lifting motor is provided to drive the lifting screw to rotate, so that the threaded sleeve moves to different set heights respectively. At the same time, the tilt hydraulic cylinder is controlled to push the load-bearing arm to rotate about the adapter seat, so that the automobile subframe is tilted at a certain angle in the vertical direction. Moreover, during the tilting process of the automobile subframe, the fixed column head rotates about the end of the telescopic arm, thereby realizing the adjustment of the processing posture of automobile subframes of different models and sizes, solving the problem that the existing technology uses a drilling machine to drill holes on the front subframe of the automobile, but the existing drilling machine cannot realize the tilt or inclined drilling of the workpiece, cannot meet the processing requirements of the front subframe of the automobile of a specific model or special shape, and limits the diversity and flexibility of the processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of an automatic processing device for automobile subframes provided by the utility model;

[0024] Figure 2 This is one of the cross-sectional structural diagrams of an automatic processing device for automobile subframes provided by the utility model;

[0025] Figure 3 This is a second schematic cross-sectional view of an automatic processing device for an automobile subframe provided by the present invention;

[0026] Figure 4 This is one of the overall structural diagrams of an automatic processing device for automobile subframes provided by the utility model;

[0027] Figure 5 This is the second overall structural diagram of an automatic processing device for automobile subframes provided by the utility model.

[0028] Indicated in the figure:

[0029] 1. Mounting frame; 11. Horizontal limit slide; 12. Motor compartment; 13. Vertical limit slide; 2. Positioning frame; 21. Positioning hydraulic cylinder; 3. Positioning slide; 31. Rack; 32. Positioning seat; 33. Positioning motor; 34. Gear; 4. Lifting seat; 41. Lifting hydraulic cylinder; 5. Stabilizing frame; 52. Motor bracket; 53. Drilling machine; 6. Lifting motor; 61. Lifting screw; 62. Threaded sleeve; 63. Adapter seat; 64. Load-bearing arm; 65. Steering hydraulic cylinder; 66. Tilt hydraulic cylinder; 7. Servo motor; 71. Displacement screw; 72. Telescopic arm; 73. Fixed column head. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0031] like Figure 1 As shown, this embodiment provides an automatic processing device for an automobile subframe, including an automatic processing device for an automobile subframe, including a mounting frame 1, and also including:

[0032] The mounting assembly is used to fix the main functional components of the connecting device, wherein the mounting assembly includes a horizontal limiting slide 11 opened on the inner wall of the mounting frame 1, a vertical limiting slide 13 opened on the inner wall of the mounting frame 1, and a motor compartment 12 provided on the outer wall of the mounting frame 1. The motor compartment 12, the horizontal limiting slide 11, and the vertical limiting slide 13 are symmetrically distributed about the central axis of the mounting frame 1;

[0033] A positioning component is provided inside the horizontal limit slide 11 and is used to locate the punching points on the vehicle subframe;

[0034] A punching assembly is provided outside the positioning assembly and is used to punch holes in the automobile subframe;

[0035] The tilt component is arranged outside the mounting frame 1 and is used to adjust the tilt angle and processing posture of the automobile subframe;

[0036] A fixing assembly is provided inside the tilt assembly and is used to fix subframes of different models and sizes;

[0037] Install each functional component on the mounting frame 1 according to actual installation requirements.

[0038] like Figure 1 and Figure 4As shown, as a preferred embodiment, on the basis of the above method, further, the positioning assembly includes a positioning frame 2 slidably connected to the inner wall of the horizontal limit slide 11, a positioning hydraulic cylinder 21 rotatably connected to the outer wall of the mounting frame 1, a positioning slide 3 opened on the inner wall of the positioning frame 2, a rack 31 fixedly connected to the outer wall of the positioning frame 2, a positioning seat 32 slidably connected to the inner wall of the positioning slide 3, a positioning motor 33 fixedly connected to the outer wall of the positioning seat 32 and a gear 34 fixedly connected to the output end of the positioning motor 33, the positioning hydraulic cylinders 21 are symmetrically distributed about the central axis of the mounting frame 1, and the positioning hydraulic cylinders 21 cooperate with each other to push the positioning frame 2 along the horizontal limit slide The rail moves in the extension direction, the positioning slide 3, the rack 31, the positioning seat 32 and the positioning motor 33 are distributed on the central axis of the positioning frame 2, the gear 34 is engaged with the rack 31, and the positioning hydraulic cylinder 21 is controlled to push the positioning frame 2 to move along the inner wall of the horizontal limit slide 11. At the same time, the positioning motor 33 is controlled to drive the gear 34 to rotate. Since the gear 34 is engaged with the rack 31, the reaction force generated when the gear 34 rotates pushes the positioning seat 32 to move along the extension direction of the positioning slide 3, and finally the positioning seat 32, the drilling machine 53 and the stabilizer frame 5 and the punching points on the automobile subframe are on the same axis, completing the positioning of the punching points on the automobile subframe.

[0039] like Figure 1 and Figure 2 As shown, as a preferred embodiment, on the basis of the above method, the punching assembly further includes a lifting seat 4 slidably connected to the inner wall of the positioning frame 2, a lifting hydraulic cylinder 41 fixedly connected to the inner wall of the positioning seat 32, a stabilizing frame 5 detachably connected to the top wall of the lifting seat 4 below the positioning frame 2, a motor bracket 52 detachably connected to the top wall of the lifting seat 4 above the positioning frame 2, and a drilling machine 53 fixedly connected to the inner wall of the motor bracket 52. The lifting hydraulic cylinders 41 above and below the positioning frame 2 push the lifting seats 4 close to each other, and the lifting hydraulic cylinder 41 is controlled to push the lifting seat 4 to move up and down along the inner wall of the positioning seat 32, so that the drilling machine 53 and the stabilizing frame 5 are close to each other. The stabilizing frame 5 is close to the bottom of the punching point of the automobile subframe, and supports the automobile subframe for drilling to prevent it from deforming during the drilling process and reducing the drilling quality. Then the drilling machine 53 is started to drill the motor automobile subframe.

[0040] like Figure 1 、 Figure 3 and Figure 5As shown, as a preferred embodiment, on the basis of the above method, further, the inclination assembly includes a lifting motor 6 fixedly connected to the inner wall of the motor compartment 12, a lifting screw 61 fixedly connected to the output end of the lifting motor 6, a threaded sleeve 62 threadedly connected to the outer wall of the lifting screw 61, an adapter seat 63 rotatably connected to the outer wall of the threaded sleeve 62, a load-bearing arm 64 rotatably connected to the outer wall of the adapter seat 63, a steering hydraulic cylinder 65 rotatably connected to the outer wall of the threaded sleeve 62, and an inclination hydraulic cylinder 66 rotatably connected to the outer wall of the threaded sleeve 62. The threaded sleeve 62 extends toward the outer wall of the mounting frame 1 through the vertical limiting slide 13, and the steering hydraulic cylinder 65 pushes the adapter seat 63 about the threaded sleeve The frame 62 rotates in the horizontal direction, and the tilt hydraulic cylinder 66 pushes the carrying arm 64 to rotate in the vertical direction about the adapter 63. When it is necessary to adjust the processing posture of the automobile subframe or to punch holes on surfaces with different tilt angles on the automobile subframe, the lifting motors 6 in different directions are controlled to drive the lifting screws 61 to rotate, so that the threaded sleeve 62 moves to different set heights. At the same time, the tilt hydraulic cylinder 66 is controlled to push the carrying arm 64 to rotate about the adapter 63, so that the automobile subframe is tilted at a certain angle in the vertical direction. During the tilting process of the automobile subframe, the fixed column head 73 rotates about the end of the telescopic arm 72 to complete the fixed adaptation to the automobile subframe with different tilt angles.

[0041] like Figure 3 and Figure 5 As shown, as a preferred embodiment, on the basis of the above method, further, the fixing assembly includes a servo motor 7 fixedly connected to the inner wall of the carrying arm 64, a displacement screw 71 fixedly connected to the output end of the servo motor 7, a telescopic arm 72 slidably connected to the inner wall of the carrying arm 64, and a fixed column head 73 rotatably connected to the end of the telescopic arm 72. The telescopic arm 72 is threadedly matched with the displacement screw 71 to control the lifting motor 6 to drive the lifting screw 61 to rotate, and the lifting screw 61 drives the threaded sleeve 62 to move up and down along the inner wall of the vertical limit slot 13, so that all the threaded sleeves 62 are at the same horizontal height, the fixed column head 73 is rotated to keep the fixed column head 73 in a vertical upward posture, the steering hydraulic cylinder 65 is controlled to push the carrying arm 64 to rotate to a specified angle with respect to the adapter 63, and the servo motor 7 is controlled to drive the displacement screw 71 to rotate. The displacement screw 71 drives the telescopic arm 72 to move along the inner wall of the carrying arm 64, and finally the position of the fixed column head 73 is made to correspond to the mounting hole position on the automobile sub-frame. The automobile sub-frame to be processed is sleeved on the outer wall of the fixed column head 73 using the mounting hole, thereby completing the fixation of automobile sub-frames of different sizes and models.

[0042] Specifically, when the device is in use: the lifting motor 6 is controlled to drive the lifting screw 61 to rotate, and the lifting screw 61 drives the threaded sleeve 62 to move up and down along the inner wall of the vertical limit slide 13, so that all the threaded sleeves 62 are at the same horizontal height, and the fixed column head 73 is rotated to keep the fixed column head 73 in a vertical upward posture, and the steering hydraulic cylinder 65 is controlled to push the carrying arm 64 to rotate to a specified angle about the adapter 63, and at the same time the servo motor 7 is controlled to drive the displacement screw 71 to rotate, and the displacement screw 71 drives the telescopic arm 72 to move along the inner wall of the carrying arm 64, and finally the fixed column head The position of 73 corresponds to the mounting hole on the automobile subframe. The automobile subframe to be processed is sleeved on the outer wall of the fixed column head 73 by using the mounting hole to complete the fixation of automobile subframes of different sizes and models. The positioning hydraulic cylinder 21 is controlled to push the positioning frame 2 to move along the inner wall of the horizontal limit slide 11. At the same time, the positioning motor 33 is controlled to drive the gear 34 to rotate. Since the gear 34 is engaged with the rack 31, the reaction force generated when the gear 34 rotates pushes the positioning seat 32 to move along the extension direction of the positioning slide 3, and finally the positioning seat 32, the drilling machine 53 and the stabilizing frame 5 as well as The punching points on the automobile subframe are on the same axis, completing the positioning of the punching points on the automobile subframe, controlling the lifting hydraulic cylinder 41 to push the lifting seat 4 to move up and down along the inner wall of the positioning seat 32, so that the drilling machine 53 and the stabilizing frame 5 are close to each other, and the stabilizing frame 5 is close to the bottom of the punching points of the automobile subframe, supporting the automobile subframe for drilling, avoiding deformation during the drilling process and reducing the drilling quality, and then starting the drilling machine 53 to drill the motor automobile subframe. When it is necessary to adjust the processing posture of the automobile subframe or to make adjustments to the different inclination angles on the automobile subframe When drilling holes on the surface, the lifting motors 6 in different directions are controlled to drive the lifting screws 61 to rotate, so that the threaded sleeves 62 are moved to different set heights. At the same time, the tilt hydraulic cylinder 66 is controlled to push the carrying arm 64 to rotate about the adapter 63, so that the automobile subframe is tilted at a certain angle in the vertical direction. During the tilting process of the automobile subframe, the fixed column head 73 rotates about the end of the telescopic arm 72 to complete the fixed adaptation of the automobile subframe with different tilt angles. After the posture adjustment of the automobile subframe is completed, the stabilizer frame 5 and the drilling machine 53 are used to drill holes on it.

[0043] All technical features in this embodiment can be freely combined according to actual needs.

[0044] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. An automatic processing device for an automobile subframe, comprising a mounting frame (1), and further comprising: The mounting assembly is used to fix the main functional components of the connecting device, characterized in that the mounting assembly includes a horizontal limiting slide groove (11) opened on the inner wall of the mounting frame (1), a vertical limiting slide groove (13) opened on the inner wall of the mounting frame (1), and a motor compartment (12) arranged on the outer wall of the mounting frame (1), and the motor compartment (12), the horizontal limiting slide groove (11) and the vertical limiting slide groove (13) are symmetrically distributed about the central axis of the mounting frame (1); A positioning component is arranged inside the horizontal limit slide (11) and is used to position the punching point on the automobile subframe; A punching assembly is provided outside the positioning assembly and is used to punch holes in the automobile subframe; An inclination component is arranged outside the mounting frame (1) and is used to adjust the inclination and processing posture of the automobile subframe; The fixing assembly is arranged inside the tilt assembly and is used to fix subframes of different models and sizes.

2. The automatic processing device for automobile subframe according to claim 1, characterized in that: The positioning assembly comprises a positioning frame (2) slidably connected to the inner wall of the horizontal limiting slide (11), a positioning hydraulic cylinder (21) rotatably connected to the outer wall of the mounting frame (1), a positioning slide (3) provided on the inner wall of the positioning frame (2), a rack (31) fixedly connected to the outer wall of the positioning frame (2), a positioning seat (32) slidably connected to the inner wall of the positioning slide (3), a positioning motor (33) fixedly connected to the outer wall of the positioning seat (32), and a gear (34) fixedly connected to the output end of the positioning motor (33), the positioning hydraulic cylinder (21) is symmetrically distributed about the central axis of the mounting frame (1), the positioning hydraulic cylinder (21) cooperates with each other to push the positioning frame (2) to move along the extension direction of the horizontal limiting slide rail, the positioning slide (3), the rack (31), the positioning seat (32) and the positioning motor (33) are distributed in pairs about the central axis of the positioning frame (2), and the gear (34) is meshed with the rack (31).

3. The automatic processing device for automobile subframe according to claim 1, characterized in that: The punching assembly comprises a lifting seat (4) slidably connected to the inner wall of the positioning frame (2), a lifting hydraulic cylinder (41) fixedly connected to the inner wall of the positioning frame (32), a stabilizing frame (5) detachably connected to the top wall of the lifting seat (4) below the positioning frame (2), a motor bracket (52) detachably connected to the top wall of the lifting seat (4) above the positioning frame (2), and a drilling machine (53) fixedly connected to the inner wall of the motor bracket (52). The lifting hydraulic cylinders (41) above and below the positioning frame (2) push the lifting seats (4) to approach each other.

4. The automatic processing device for automobile subframe according to claim 1, characterized in that: The tilt assembly comprises a lifting motor (6) fixedly connected to the inner wall of the motor compartment (12), a lifting screw (61) fixedly connected to the output end of the lifting motor (6), a threaded sleeve (62) threadedly connected to the outer wall of the lifting screw (61), a transfer seat (63) rotatably connected to the outer wall of the threaded sleeve (62), a bearing arm (64) rotatably connected to the outer wall of the transfer seat (63), a steering hydraulic cylinder (65) rotatably connected to the outer wall of the threaded sleeve (62), and a tilt hydraulic cylinder (66) rotatably connected to the outer wall of the threaded sleeve (62); the threaded sleeve (62) extends toward the outer wall of the mounting frame (1) through a vertical limiting slot (13); the steering hydraulic cylinder (65) pushes the transfer seat (63) to rotate in a horizontal direction relative to the threaded sleeve (62); and the tilt hydraulic cylinder (66) pushes the bearing arm (64) to rotate in a vertical direction relative to the transfer seat (63).

5. The automatic processing device for automobile subframe according to claim 1, characterized in that: The fixing assembly comprises a servo motor (7) fixedly connected to the inner wall of the carrying arm (64), a displacement screw (71) fixedly connected to the output end of the servo motor (7), a telescopic arm (72) slidably connected to the inner wall of the carrying arm (64), and a fixed column head (73) rotatably connected to the end of the telescopic arm (72), wherein the telescopic arm (72) is threadedly engaged with the displacement screw (71).

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