Gear measuring device

Abstract

The invention relates to the technical field of gear shaft surface detection, and provides a gear measuring device which comprises a base, two sliding rails, a sliding seat, a switching mechanism and a laser range finder, the sliding rails are fixedly arranged on the base, one sliding rail is in a linear shape, and the other sliding rail is in an arc shape; the sliding seat is arranged on the base; the switching mechanism is used for controlling the sliding base to slide in the direction of one sliding rail. And the laser range finder is fixedly arranged on the sliding seat and is used for measuring the axial surface of the gear. According to the gear measuring device, the linear sliding rail and the arc-shaped sliding rail are arranged, the switching mechanism is used for controlling the sliding base to move in the direction of one sliding rail, the laser range finder can move in the directions of the different sliding rails, and the gear measuring device is made to adapt to different measuring working conditions; therefore, the requirements of modern high-precision gear manufacturing and detection are met.

Description

Technical Field

[0001] This invention relates to the field of gear shaft surface inspection technology, and in particular to a gear measuring device. Background Technology

[0002] In the field of mechanical transmission, gears are key transmission components, and their machining accuracy directly affects the smoothness of equipment operation, noise level, and service life. Among these, the flatness of the gear shaft surface is one of the important indicators for measuring gear quality.

[0003] Traditional gear shaft surfaces are mostly planar structures. Therefore, existing gear measuring devices typically use linear guides in conjunction with laser rangefinders or contact probes to perform linear scanning of the gear end face in order to evaluate its flatness error.

[0004] However, with the increasing demands of modern industry on the performance of transmission systems, gears under certain special operating conditions (such as high-speed heavy loads, space-constrained applications, or applications requiring compensation for assembly errors) are increasingly adopting non-planar shaft surface designs, such as spherical, curved, or even helical shaft surfaces, to improve stress distribution, enhance meshing performance, or achieve self-alignment. While these non-planar shaft surfaces improve performance, they also bring new challenges to inspection.

[0005] Existing gear measuring devices typically only have linear guide rails, which limits the laser rangefinder to moving along a straight path, making it ineffective for detecting spherical or other complex-shaped gear shaft surfaces. Even if the guide rail can be replaced, the process is cumbersome, inefficient, and prone to introducing installation errors. Summary of the Invention

[0006] In view of this, the present invention proposes a gear measuring device that enables a laser rangefinder to move along different slide rail directions, making the gear measuring device adaptable to different measuring conditions and meeting the needs of modern high-precision gear manufacturing and testing.

[0007] The technical solution of this invention is implemented as follows: This invention provides a gear measuring device, including a base, two slide rails, a slide block, a switching mechanism, and a laser rangefinder. The slide rails are fixedly mounted on the base, with one slide rail being straight and the other curved. The slide block is mounted on the base. The switching mechanism controls the slide block to slide along one of the slide rails. The laser rangefinder is fixedly mounted on the slide block and is used to measure the shaft surface of the gear.

[0008] Based on the above technical solutions, preferably, the switching mechanism includes two limiting frames, a limiter, and a first spring. The limiting frames are slidably disposed on the base and fixedly connected to the base through the limiter. The first spring is abutting between the two limiting frames. The two slide rails are disposed opposite to each other on both sides of the first spring. When the slide block abuts against the limiting frame located at one end of the first spring, the slide block slides along the direction of the slide rail located at the other end of the first spring.

[0009] Based on the above technical solutions, preferably, the limiting frame includes a longitudinal plate and a transverse plate. The longitudinal plate is slidably disposed on the base and fixedly connected to the base through the limiting device. The first spring is abutted between the two longitudinal plates. The transverse plate is fixedly disposed on the longitudinal plate and slidably connected to the slide block, and one of the transverse plates can abut against the slide block.

[0010] Based on the above technical solutions, preferably, the base is provided with a sliding hole; the limiter includes a screw, which is connected to the limit frame by a threaded engagement and is slidably connected to the sliding hole, and the screw abuts against the side of the base away from the limit frame.

[0011] Based on the above technical solutions, preferably, the end of the screw away from the limiting frame is provided with an installation groove; the limiting device also includes a limiting shaft, a sliding shaft and a knob, the limiting shaft is fixedly disposed in the installation groove; the sliding shaft is rotatably and slidably disposed in the installation groove and can be engaged with the limiting shaft; the knob is fixedly disposed on the sliding shaft and located on the side of the screw away from the limiting frame.

[0012] Based on the above technical solutions, preferably, the limiter further includes a second spring, which is disposed in the mounting groove and abuts against the end of the sliding shaft near the limit frame.

[0013] Based on the above technical solution, preferably, the slide rail includes a plurality of first limiting rods and a plurality of second limiting rods, both of which are fixedly mounted on the base. The plurality of first limiting rods are spaced apart along an arc direction, and the plurality of second limiting rods are spaced apart along a straight line direction. The slide block includes a base body, a first gear, and a second gear. The first gear and the second gear are rotatably mounted on the base body and correspond to the first limiting rod and the second limiting rod, respectively. When the first gear meshes with the first limiting rod, the second gear disengages from the second limiting rod; when the second gear meshes with the second limiting rod, the first gear disengages from the first limiting rod.

[0014] Based on the above technical solutions, preferably, the base is provided with a plurality of elongated holes, the first limiting rod is fixedly disposed in the elongated holes and can be slidably connected with the elongated holes, and the first limiting rod corresponds one-to-one with the elongated holes.

[0015] Based on the above technical solutions, preferably, the elongated hole is a stepped hole, and the inner diameter of the end of the elongated hole away from the laser rangefinder is larger than the inner diameter of the end of the elongated hole near the laser rangefinder; the first limiting rod includes a rod body, a screw, a nut, and a limiting head; the rod body is slidably disposed in the elongated hole at the end away from the laser rangefinder and meshes with the first gear; the screw is coaxially fixed to the rod body and slidably disposed in the elongated hole at the end near the laser rangefinder; the nut is threadedly connected to the screw and abuts against the side of the base near the laser rangefinder; the limiting head is fixedly disposed at the end of the rod body away from the laser rangefinder.

[0016] Based on the above technical solutions, preferably, the slide also includes a three-dimensional adjustment platform, which is fixedly mounted on the base body, and the laser rangefinder is fixedly mounted on the output end of the three-dimensional adjustment platform.

[0017] The gear measuring device of the present invention has the following advantages over the prior art:

[0018] (1) By setting a linear slide rail and an arc slide rail, and using a switching mechanism to control the slide block to move along one of the slide rails, the laser rangefinder can move along different slide rail directions, so that the gear measuring device can adapt to different measuring conditions, thereby meeting the needs of modern high-precision gear manufacturing and testing.

[0019] (2) By setting the limiter to include screws, limit shafts, sliding shafts, knobs and a first spring, the limiter can be prevented from loosening due to external interference, thus improving the stability of the limiter frame.

[0020] (3) By setting the elongated hole and the first limiting rod, the position of the first limiting rod can be adjusted arbitrarily, thereby improving the adaptability of this measuring device; by setting the first limiting rod to include a rod body, a screw, a nut and a limiting head, the fixing firmness of the first limiting rod can be improved, thereby promoting the smooth movement of the laser rangefinder. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of a gear measuring device according to the present invention.

[0023] Figure 2 This is a bottom view of a gear measuring device according to the present invention.

[0024] Figure 3 This is a left view of a gear measuring device according to the present invention.

[0025] Figure 4 This is a cross-sectional view of the first spring in a gear measuring device according to the present invention.

[0026] Figure 5 This is a cross-sectional view of the limiting frame in a gear measuring device according to the present invention.

[0027] Figure 6 This is a cross-sectional view of the limiter in a gear measuring device according to the present invention.

[0028] Figure 7 This is a perspective view of the knob in a gear measuring device according to the present invention.

[0029] Figure 8 This is a perspective view of the mounting groove in a gear measuring device according to the present invention.

[0030] Figure 9 This is a cross-sectional view of the first limiting rod in a gear measuring device according to the present invention.

[0031] Figure 10 This is a top view of the base of a gear measuring device according to the present invention.

[0032] Figure 11 This is a perspective view of the three-dimensional adjustment platform in a gear measuring device according to the present invention.

[0033] The components include: 1. Base; 101. Sliding hole; 102. Elongated hole; 2. Slide rail; 21. First limiting rod; 22. Second limiting rod; 211. Rod body; 212. Screw; 213. Nut; 214. Limiting head; 3. Slide seat; 31. Seat body; 32. First gear; 33. Second gear; 34. Three-dimensional adjustment platform; 4. Switching mechanism; 41. Limiting frame; 42. Limiter; 43. First spring; 411. Vertical plate; 412. Horizontal plate; 421. Screw; 422. Limiting shaft; 423. Sliding shaft; 424. Knob; 425. Second spring; 401. Mounting groove; 5. Laser rangefinder. Detailed Implementation

[0034] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0035] The present invention provides a gear measuring device, comprising a base 1, a slide rail 2, a slide block 3, a switching mechanism 4, and a laser rangefinder 5, for detecting the flatness of the gear shaft surface.

[0036] Base 1 is mounted on the test platform and located on one side of the gear shaft surface, as shown below. Figure 1 As shown, slide rail 2 is fixedly mounted on base 1, slide block 3 is mounted on base 1, and laser rangefinder 5 is fixedly mounted on slide block 3. When slide block 3 moves along slide rail 2, it can drive laser rangefinder 5 to move along slide rail 2, thereby scanning the gear shaft surface and detecting the flatness of the gear shaft surface. Since the moving trajectory of laser rangefinder 5 is parallel to the gear shaft surface, if the distance detected by laser rangefinder 5 does not change, it indicates that the flatness of the gear shaft surface is good; otherwise, it indicates that the flatness of the gear shaft surface is abnormal.

[0037] The shaft surface of a gear is usually flat. However, to adapt to different operating conditions, it is sometimes necessary to design the shaft surface of the gear to be spherical. In order for the laser rangefinder 5 to detect the spherical gear shaft surface, two slide rails 2 are set up. One slide rail 2 is straight and the other slide rail 2 is curved. The switching mechanism 4 is used to control the slide 3 to slide along one of the slide rails 2. When the slide 3 slides along the straight slide rail 2, the laser rangefinder 5 measures the flat gear shaft surface. When the slide 3 slides along the curved slide rail 2, the laser rangefinder 5 measures the spherical gear shaft surface.

[0038] As a preferred embodiment, such as Figure 4As shown, the switching mechanism 4 includes two limit frames 41, a limiter 42, and a first spring 43. The limit frames 41 are slidably mounted on the base 1 and are fixedly connected to the base 1 through the limiter 42. The first spring 43 is abutted between the two limit frames 41. Two slide rails 2 are arranged opposite to each other on both sides of the first spring 43. When the slide block 3 abuts against the limit frame 41 located at one end of the first spring 43, the slide block 3 slides along the slide rail 2 located at the other end of the first spring 43.

[0039] like Figure 3 As shown, the left limiting frame 41 is moved to the right, and the left limiting device 42 is used to fix the left limiting frame 41 and the base 1 together, while the right limiting device 42 is not allowed to fix the right limiting frame 41 and the base 1. The elastic force of the first spring 43 can cause the right limiting frame 41 to press against the slide block 3 to the right. At this time, the slide block 3 can slide along the direction of the left slide rail 2; conversely, the slide block 3 can slide along the direction of the right slide rail 2, so that the laser rangefinder 5 can slide in two directions, which is suitable for measuring two kinds of gear shaft surfaces.

[0040] The limiter 42 includes a screw 421, a limit shaft 422, a slide shaft 423, a knob 424, and a second spring 425, as shown below. Figure 2 and Figure 6 As shown, a sliding hole 101 is provided on the base 1. The screw 421 is connected to the limit frame 41 by threaded engagement and is slidably connected with the sliding hole 101. When the screw 421 is tightened, the lower end of the screw 421 abuts against the side of the base 1 away from the limit frame 41, thereby fixing the limit frame 41 and the base 1. When the screw 421 is loosened, the limit frame 41 can slide.

[0041] A mounting groove 401 is provided at the end of screw 421 away from the limiting bracket 41. The limiting shaft 422 is fixedly installed in the mounting groove 401. The sliding shaft 423 is rotatably and slidably installed in the mounting groove 401. A knob 424 is fixedly installed on the sliding shaft 423 and located on the side of screw 421 away from the limiting bracket 41. Figure 6 As shown, the mounting groove 401 is located at the lower end of the screw 421. In its natural state, the sliding shaft 423 slides downwards under gravity, separating it from the limiting shaft 422. This allows the knob 424 and the sliding shaft 423 to rotate freely without causing the screw 421 to rotate. Figure 7 As shown, the knob 424 is relatively large, which can effectively block the lower end of the screw 421, preventing external objects from contacting the screw 421 and avoiding accidental activation of the screw 421.

[0042] like Figure 6As shown, when the knob 424 is slid upward, the sliding shaft 423 can be engaged with the limiting shaft 422. Therefore, the screw 421 will only be rotated when the knob 424 is slid upward, the sliding shaft 423 is engaged with the limiting shaft 422, and the knob 424 is rotated synchronously, effectively preventing the screw 421 from being accidentally touched.

[0043] The second spring 425 is installed in the mounting groove 401 and abuts against the end of the slide shaft 423 near the limit bracket 41. The elastic force of the second spring 425 can allow the slide shaft 423 and the knob 424 to quickly return to their original positions, preventing the slide shaft 423 from sagging due to rust or other reasons.

[0044] like Figure 3 and Figure 5 As shown, the bottom side of the slide block 3 is provided with a T-slot. The limiting frame 41 includes a longitudinal plate 411 and a transverse plate 412. The longitudinal plate 411 is slidably mounted on the base 1 and fixedly connected to the base 1 by a limiter 42. The first spring 43 is abutting between the two longitudinal plates 411. The transverse plate 412 is fixedly mounted on the longitudinal plate 411, perpendicular to the longitudinal plate 411, and slidably connected to the slide block 3, thereby improving the moving stability of the slide block 3. Figure 3 As shown, when the switching mechanism 4 controls the slide block 3 to slide along the left slide rail 2, the right end of the right horizontal plate 412 abuts against the slide block 3, and conversely, the left end of the left horizontal plate 412 abuts against the slide block 3.

[0045] like Figure 2 As shown, the slide rail 2 includes multiple first limiting rods 21 and multiple second limiting rods 22. The first limiting rods 21 and the second limiting rods 22 are both fixedly mounted on the base 1. The multiple first limiting rods 21 are spaced apart along the arc direction to form an arc-shaped slide rail 2, and the multiple second limiting rods 22 are spaced apart along the straight direction to form a straight slide rail 2.

[0046] Correspondingly, the slide block 3 includes a seat body 31, a first gear 32, and a second gear 33. The first gear 32 and the second gear 33 are both rotatably mounted on the seat body 31 and correspond to the first limiting rod 21 and the second limiting rod 22, respectively. When the first gear 32 meshes with the first limiting rod 21, the second gear 33 separates from the second limiting rod 22. By driving the first gear 32 and the second gear 33 to rotate, the seat body 31 can slide along an arc. When the second gear 33 meshes with the second limiting rod 22, the first gear 32 separates from the first limiting rod 21. By driving the first gear 32 and the second gear 33 to rotate, the seat body 31 can slide along a straight line.

[0047] The first gear 32 and the second gear 33 are preferably driven synchronously by the same motor, and the first gear 32 and the second gear 33 rotate in opposite directions, such as Figure 10As shown, the middle shaft is the output shaft of the motor, which is connected to the gear shaft of the first gear 32 via a synchronous belt, and to the gear shaft of the second gear 33 via gear meshing, thereby realizing the reverse rotation of the first gear 32 and the second gear 33.

[0048] Since gear shaft surfaces are typically flat, a linear guide rail 2 is essential. Besides spherical shapes, gear shaft surfaces can also be curved, helical, and other shapes. To allow this measuring device to adapt to various gear shaft surface shapes, one guide rail 2 can be set to be linear, allowing the shape of the other guide rail 2 to be adjusted.

[0049] As a preferred embodiment, such as Figure 2 As shown, the base 1 is provided with multiple elongated holes 102. The first limiting rod 21 is fixedly installed in the elongated hole 102 and can be slidably connected with the elongated hole 102. The first limiting rod 21 corresponds to the elongated hole 102 one by one. By sliding the first limiting rod 21 in the elongated hole 102, multiple first limiting rods 21 can be combined to form slide rails 2 of different shapes.

[0050] like Figure 9 As shown, the elongated hole 102 is a stepped hole, and the inner diameter of the end of the elongated hole 102 away from the laser rangefinder 5 is larger than the inner diameter of the end of the elongated hole 102 close to the laser rangefinder 5. The first limiting rod 21 includes a rod body 211, a screw 212, a nut 213, and a limiting head 214. The upper end of the rod body 211 is slidably disposed in the elongated hole 102 away from the laser rangefinder 5, and the lower end of the rod body 211 meshes with the first gear 32. The lower end of the screw 212 is coaxially fixed on the rod body 211 and slidably disposed in the elongated hole 102 close to the laser rangefinder 5. The nut 213 is threadedly connected to the screw 212 and abuts against the side of the base 1 close to the laser rangefinder 5. This not only allows the first limiting rod 21 to move and adjust on the base 1 by rotating the nut 213, but also improves the connection between the first limiting rod 21 and the base 1.

[0051] The limiting head 214 is fixedly installed at the end of the rod 211 away from the laser rangefinder 5 and is located on the side of the first gear 32 away from the laser rangefinder 5, so as to avoid collision between external objects and the first gear 32 and improve the safety of the measuring device.

[0052] The structure of the second limiting rod 22 can be the same as that of the first limiting rod 21.

[0053] The slide block 3 also includes a three-dimensional adjustment stage 34, which is fixedly mounted on the base 31. The laser rangefinder 5 is fixedly mounted on the output end of the three-dimensional adjustment stage 34. The three-dimensional adjustment stage 34 is existing technology. Figure 11As shown, the three-dimensional adjustment platform 34 includes two mutually perpendicular linear modules and a lifting platform located above the upper linear module. The laser rangefinder 5 is installed above the lifting platform. By raising and lowering the lifting platform, the height of the laser rangefinder 5 can be adjusted. By moving the two linear modules, the laser rangefinder 5 can be moved on the horizontal plane, thereby adjusting the accuracy of the laser rangefinder 5.

[0054] The working principle of the gear measuring device of the present invention is as follows:

[0055] like Figure 2 As shown, first press and rotate the two knobs 424 to loosen the two screws 421. Then slide the upper knob 424 downward to make the second gear 33 mesh with the second limiting rod 22. Finally, press and rotate the upper knob 424 to tighten the upper screw 421. This allows the slide block 3 to slide along the arrangement direction of the multiple second limiting rods 22, thereby allowing the laser rangefinder 5 to slide in a straight line to measure the planar gear shaft surface.

[0056] like Figure 2 As shown, firstly, the positions of the multiple first limiting rods 21 are moved so that the arrangement trajectory of the multiple first limiting rods 21 is the same as the trajectory of the gear shaft surface. Then, the two knobs 424 are pressed and rotated to loosen the two screws 421. Next, the lower knob 424 is slid upward to make the first gear 32 mesh with the first limiting rods 21. Finally, by pressing and rotating the lower knob 424, the lower screw 421 is tightened, so that the slide block 3 can slide along the arrangement direction of the multiple first limiting rods 21, thereby making the laser rangefinder 5 slide in a non-linear direction to measure the non-planar gear shaft surface.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gear measuring device, characterized in that: It includes a base (1), two slide rails (2), a slide block (3), a switching mechanism (4), and a laser rangefinder (5), wherein, The slide rail (2) is fixedly mounted on the base (1), and one of the slide rails (2) is straight and the other slide rail (2) is curved. The slide (3) is disposed on the base (1); The switching mechanism (4) is used to control the slide block (3) to slide along one of the slide rails (2); The laser rangefinder (5) is fixedly mounted on the slide (3) and is used to measure the shaft surface of the gear.

2. The gear measuring device as described in claim 1, characterized in that: The switching mechanism (4) includes two limit frames (41), a limiter (42) and a first spring (43). The limit frames (41) are slidably disposed on the base (1) and fixedly connected to the base (1) through the limiter (42). The first spring (43) is abutted between the two limit frames (41). The two slide rails (2) are arranged opposite each other on both sides of the first spring (43). When the slide block (3) abuts against the limiting frame (41) located at one end of the first spring (43), the slide block (3) slides along the direction of the slide rail (2) located at the other end of the first spring (43).

3. The gear measuring device as described in claim 2, characterized in that: The limiting frame (41) includes a longitudinal plate (411) and a transverse plate (412). The longitudinal plate (411) is slidably disposed on the base (1) and fixedly connected to the base (1) by the limiting device (42). The first spring (43) is abutted between the two longitudinal plates (411). The transverse plate (412) is fixedly disposed on the longitudinal plate (411) and slidably connected to the slide (3). One of the transverse plates (412) can abut against the slide (3).

4. The gear measuring device as described in claim 2, characterized in that: The base (1) is provided with a sliding hole (101); The limiter (42) includes a screw (421), which is threadedly connected to the limit frame (41) and slidably connected to the sliding hole (101). The screw (421) abuts against the side of the base (1) away from the limit frame (41).

5. The gear measuring device as described in claim 4, characterized in that: The screw (421) has a mounting groove (401) at the end away from the limiting frame (41). The limiter (42) further includes a limit shaft (422), a sliding shaft (423), and a knob (424). The limit shaft (422) is fixedly disposed in the mounting groove (401). The sliding shaft (423) is rotatably and slidably disposed in the mounting groove (401) and can be engaged with the limit shaft (422). The knob (424) is fixedly disposed on the sliding shaft (423) and is located on the side of the screw (421) away from the limit frame (41).

6. The gear measuring device as described in claim 5, characterized in that: The limiter (42) also includes a second spring (425), which is disposed in the mounting groove (401) and abuts against one end of the slide shaft (423) near the limiter (41).

7. The gear measuring device as described in claim 1, characterized in that: The slide rail (2) includes multiple first limiting rods (21) and multiple second limiting rods (22). The first limiting rods (21) and the second limiting rods (22) are fixedly mounted on the base (1). The multiple first limiting rods (21) are spaced apart along the arc direction, and the multiple second limiting rods (22) are spaced apart along the straight direction. The slide block (3) includes a seat body (31), a first gear (32) and a second gear (33). The first gear (32) and the second gear (33) are rotatably mounted on the seat body (31) and correspond to the first limiting rods (21) and the second limiting rods (22) respectively. When the first gear (32) meshes with the first limiting rod (21), the second gear (33) separates from the second limiting rod (22). When the second gear (33) meshes with the second limiting rod (22), the first gear (32) separates from the first limiting rod (21).

8. The gear measuring device as described in claim 7, characterized in that: The base (1) is provided with a plurality of elongated holes (102), the first limiting rod (21) is fixedly disposed in the elongated holes (102) and can be slidably connected with the elongated holes (102), and the first limiting rod (21) corresponds one-to-one with the elongated holes (102).

9. A gear measuring device as described in claim 8, characterized in that: The elongated hole (102) is a stepped hole, and the inner diameter of the end of the elongated hole (102) away from the laser rangefinder (5) is larger than the inner diameter of the end of the elongated hole (102) close to the laser rangefinder (5). The first limiting rod (21) includes a rod body (211), a screw (212), a nut (213), and a limiting head (214). The rod body (211) is slidably disposed in the elongated hole (102) at one end away from the laser rangefinder (5) and meshes with the first gear (32). The screw (212) is coaxially fixed on the rod body (211) and slidably disposed in the elongated hole (102) at one end close to the laser rangefinder (5). The nut (213) is threadedly connected to the screw (212) and abuts against the side of the base (1) close to the laser rangefinder (5). The limiting head (214) is fixedly disposed at one end of the rod body (211) away from the laser rangefinder (5).

10. A gear measuring device as described in claim 7, characterized in that: The slide (3) also includes a three-dimensional adjustment platform (34), which is fixedly mounted on the seat (31), and the laser rangefinder (5) is fixedly mounted on the output end of the three-dimensional adjustment platform (34).

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