End jump detection device

Abstract

The embodiment of the utility model provides an end jump detection device, and relates to the technical field of tolerance detection. The end jump detection device comprises a rack, a placing table, a rotating disc, an axial pressurizing piece and a pressing rod, the placing table is arranged on the rack, the rotating disc and the placing table are oppositely arranged, the placing table is used for placing a workpiece, a limiting groove is formed in the middle of the rotating disc, the limiting groove is used for clamping the workpiece, and the rotating disc drives the workpiece to synchronously rotate for end jump detection; the axial pressurizing part is installed on the rack, the pressing rod is connected with the axial pressurizing part, and the axial pressurizing part and the pressing rod are used for axially pressurizing the rotating disc, so that the rotating disc compresses a workpiece, axial displacement of the workpiece in the rotating process is avoided, the end jump detection device applies pressure in the axial direction of the rotating disc, the accuracy of detection of the end jump value of the workpiece is improved, and the detection accuracy of the end jump value of the workpiece is improved. And the workpiece cannot be damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of tolerance detection, and more specifically, to an end jump detection device. Background Art

[0002] For a rotating transmission workpiece (hereinafter referred to as workpiece) to meet the transmission stability, it is necessary to detect the end jump value of the workpiece to determine whether the workpiece is qualified. The existing end jump detection devices usually clamp the workpiece radially and then rotate it. Since no pressure is applied to the workpiece axially, the workpiece will have a small axial displacement during high-speed rotation. This axial displacement will affect the detection of the end jump value, resulting in inaccurate measured end jump values. Increasing the radial clamping force of the workpiece is likely to cause damage to the workpiece. Summary of the Utility Model

[0003] The utility model provides an end jump detection device, which overcomes the problem of inaccurate detection of the end jump value of the workpiece by applying pressure axially to the workpiece to overcome the axial displacement of the workpiece.

[0004] The embodiments of the utility model can be implemented as follows:

[0005] The embodiments of the utility model provide an end jump detection device, which includes:

[0006] A frame; and

[0007] A placement table, which is arranged on the frame and is used for placing the workpiece;

[0008] A turntable, which is arranged opposite to the placement table. A limiting groove is arranged in the middle of the turntable for clamping the workpiece, and the turntable drives the workpiece to rotate synchronously;

[0009] An axial pressure applying member and a pressure rod. The axial pressure applying member is installed on the frame, and the pressure rod is connected to the axial pressure applying member. The axial pressure applying member and the pressure rod are used for axially pressurizing the turntable.

[0010] Optionally, the end jump detection device further includes a turntable clamping member, a pressing block and a rotation driving member. The rotation driving member is connected to the turntable clamping member, and the rotation driving member drives the pressing block to rotate; the pressing block is rotatably connected to the turntable clamping member, and the pressing block is movably connected to the turntable.

[0011] Optionally, a pin hole is arranged on the turntable, and a pin is arranged on the pressing block. The pin is adapted to the pin hole.

[0012] Optionally, a first slide rail is arranged on the frame, and a first slider is slidably arranged on the first slide rail. The turntable clamping member is installed on the first slider.

[0013] Optionally, a second slider is slidably arranged on the first slide rail, a positioning plate is connected to the second slider, and the pressing rod is connected to the positioning plate.

[0014] Optionally, a first lifting driving member is arranged on the frame, and the first lifting driving member is connected to the turntable clamping member.

[0015] Optionally, a second lifting driving member and a lifting rod are further arranged on the frame. One end of the lifting rod is connected to the second lifting driving member, and the other end of the lifting rod is connected to the placing table.

[0016] Optionally, a through hole penetrating both side surfaces is arranged in the middle of the pressing block, and the pressing rod can move along the through hole.

[0017] Optionally, a position sensor for detecting the position of the turntable is arranged on the frame.

[0018] Optionally, a displacement sensor for detecting the axial displacement of the turntable is arranged on the frame.

[0019] The beneficial effects of the end runout detection device according to the embodiment of the present invention include, for example:

[0020] The end runout detection device includes a frame, a placing table, a turntable, an axial pressing member and a pressing rod. The placing table is arranged on the frame, the turntable is arranged opposite to the placing table, the placing table is used for placing a workpiece, a limiting groove is arranged in the middle of the turntable, the limiting groove is used for clamping the workpiece, and the turntable drives the workpiece to rotate synchronously for end runout detection; the axial pressing member is installed on the frame, the pressing rod is connected to the axial pressing member, and the axial pressing member and the pressing rod are used for axially pressing the turntable, so that the turntable presses the workpiece tightly, avoiding axial displacement of the workpiece during rotation. By applying pressure axially to the turntable, the end runout detection device improves the accuracy of detecting the end runout value of the workpiece and does not damage the workpiece. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is the first view of the structure of the end runout detection device provided in the embodiment of the present invention;

[0023] Figure 2 It is the second view of the structure of the end runout detection device provided in the embodiment of the present invention;

[0024] Figure 3Schematic diagram of the structure of the end jump detection device after hiding the rack provided in the embodiment of the present invention;

[0025] Figure 4 Schematic diagram of the structure of the rack provided in the embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the turntable provided in the embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the structure of the second slide rail and the mounting base plate provided in the embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the structure of the driving gear ring and the driven gear ring provided in the embodiment of the present invention;

[0029] Figure 8 Schematic diagram of the structure of the turntable clamping member and the rotation driving member provided in the embodiment of the present invention;

[0030] Figure 9 Schematic diagram of the structure of the turntable clamping member provided in the embodiment of the present invention;

[0031] Figure 10 Schematic diagram of the connection structure of the pressing block and the connecting ring block provided in the embodiment of the present invention;

[0032] Figure 11 First schematic diagram of the positional relationship between the displacement sensor and the turntable provided in the embodiment of the present invention;

[0033] Figure 12 Second schematic diagram of the positional relationship between the displacement sensor and the turntable provided in the embodiment of the present invention.

[0034] Icon: 10 - Rack; 101 - First lifting drive member; 102 - Telescopic rod; 103 - Connecting block body; 104 - First slide rail; 105 - First slider; 106 - Second slider; 107 - Positioning plate; 108 - Displacement sensor; 109 - Position sensor; 20 - Placement table; 201 - Second lifting drive member; 202 - Lifting rod; 30 - Turntable; 301 - Limiting groove; 302 - Pin hole; 40 - Axial pressing member; 401 - Pressing rod; 50 - Turntable clamping member; 501 - Rotation drive member; 502 - Pressing block; 5021 - Pin; 503 - Connecting ring block; 504 - Driving gear ring; 505 - Driven gear ring; 60 - Radial clamping block; 601 - Mounting base plate; 602 - Second slide rail; 603 - Third slider; 604 - Jacking cylinder; 605 - Pushing cylinder; 70 - Workpiece. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0037] It should be noted that like reference numerals and letters denote like items in the following accompanying drawings. Therefore, once an item is defined in one of the accompanying drawings, it does not need to be further defined and explained in subsequent accompanying drawings.

[0038] In the description of the present utility model, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship in which the product of the present utility model is usually placed during use. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0039] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0040] The term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0041] Unless otherwise clearly defined and limited, terms such as "arrangement" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] It should be noted that, without conflict, the features in the embodiments of the present utility model can be combined with each other.

[0043] When rotating a transmission workpiece (hereinafter referred to as the workpiece), the transmission stability needs to be satisfied, and the end run-out value of the workpiece needs to be detected to determine whether the workpiece is qualified. Existing end run-out detection devices usually clamp the workpiece radially and then rotate it. Since no pressure is applied to the workpiece axially, the workpiece will have a small axial displacement during high-speed rotation, which will affect the detection of the end run-out value, resulting in low accuracy of the measured end run-out value. And increasing the radial clamping force of the workpiece is likely to cause damage to the workpiece.

[0044] The end run-out detection device provided in the embodiments of the present utility model can solve the above problems and will be described in detail below.

[0045] Please refer to Figures 1 to 3 , the end run-out detection device includes a frame 10, a placement table 20, a turntable 30, an axial pressing member 40 and a pressing rod 401. The placement table 20 is arranged on the frame 10. The frame 10 is used to provide an installation and connection position for the placement table 20, the turntable 30 and the axial pressing member 40; the placement table 20 is used to place the workpiece 70 to be detected; the turntable 30 is arranged opposite to the placement table 20, and the space between the turntable 30 and the placement table 20 is used to accommodate the workpiece 70, and the turntable 30 drives the workpiece 70 to rotate synchronously to detect the end run-out value of the workpiece 70; the axial pressing member 40 is installed on the frame 10, the pressing rod 401 is connected to the axial pressing member 40, and the axial pressing member 40 and the pressing rod 401 are used to axially press the turntable 30 to press the workpiece 70 between the turntable 30 and the placement table 20, preventing the workpiece 70 from having an axial displacement during high-speed rotation and affecting the detection of the end run-out value of the workpiece 70. By setting the axial pressing member 40 and the pressing rod 401 to press the turntable 30 against the workpiece 70, the detection accuracy of the end run-out value is improved.

[0046] The following details the end run-out detection device.

[0047] Please also refer to Figure 4 , Figure 5 and Figure 2, the frame 10 is in a U-shaped frame structure, with a hollowed-out cavity in the middle. The upper part of the hollowed-out cavity is the upper platform, and the lower part of the hollowed-out cavity is the lower platform. The placement table 20 is located in the hollowed-out cavity and installed on the lower platform. The turntable 30 is also located in the hollowed-out cavity and installed on the upper platform. The axial pressing member 40 is installed on the upper platform. The pressing rod 401 is connected to the output end of the axial pressing member 40 and is located above the turntable 30. The axial pressing member 40 presses the turntable 30 through the pressing rod 401. The workpiece 70 is placed on the placement table 20 and is clamped and driven to rotate by the turntable 30.

[0048] Specifically, a limiting groove 301 is provided in the middle of the turntable 30. The limiting groove 301 is used to clamp the workpiece 70. The shape of the limiting groove 301 is adapted to the workpiece 70 to prevent relative rotation between the workpiece 70 and the turntable 30 during rotation. The limiting groove 301 is a blind hole, with one end penetrating the surface of the turntable 30 and the other end located inside the turntable 30.

[0049] In order to enable the workpiece 70 on the placement table 20 to move up and down and adjust the distance between the turntable 30 and the pressing rod 401, a second lifting drive member 201 and a lifting rod 202 are provided at the lower part of the placement table 20. One end of the lifting rod 202 is connected to the second lifting drive member 201, and the other end of the lifting rod 202 is connected to the placement table 20 through a bearing. When the second lifting drive member 201 works, it drives the lifting rod 202 to move up and down, thereby pushing the placement table 20 to move up and down to achieve the purpose of moving the workpiece 70 up and down.

[0050] Furthermore, the second lifting drive member 201 is a cylinder or a hydraulic cylinder, and the lifting rod 202 is a piston rod. One end of the piston rod is slidably matched with the cylinder body of the cylinder or the hydraulic cylinder, and the other end is sleeved with a bearing and connected to the placement table 20 through the bearing. The bearing here can be a plain bearing.

[0051] Reference Figure 6 And in combination with Figure 2, a mounting base plate 601 is provided on the lower platform of the frame 10, and the mounting base plate 601 is connected to the frame 10 by screws or bolts. Radial clamping blocks 60 are arranged on the mounting base plate 601. There are two radial clamping blocks 60 and they are symmetrically arranged. The workpiece 70 is radially clamped and fixed by the radial clamping blocks 60. A second slide rail 602 is also provided on the mounting base plate 601. The number of the second slide rails 602 is four. The four second slide rails 602 are parallel and arranged at intervals. The lengths and dimensions of the four second slide rails 602 are the same. A third slider 603 is slidably arranged on each of the four second slide rails 602. Two third sliders 603 that are parallel and on the same side are connected together by a connecting plate. The two radial clamping blocks 60 are respectively connected to the two connecting plates. The two connecting plates are also respectively connected to two pushing cylinders 605. When the pushing cylinders 605 work, the third sliders 603 slide on the second slide rails 602, driving the connected connecting plates to move, and further driving the two radial clamping blocks 60 to move relatively, so as to realize radial clamping or radial loosening of the workpiece 70.

[0052] Furthermore, lifting cylinders 604 are provided on both connecting plates. The radial clamping blocks 60 are connected to the lifting cylinders 604. When the lifting cylinders 604 work, the radial clamping blocks 60 are lifted up and down to synchronously meet the up and down lifting of the workpiece 70 driven by the second lifting driving member 201, so that the radial clamping blocks 60 can always clamp the workpiece 70. In practice, the lifting cylinders 604 work synchronously with the second lifting driving member 201, and the lifting height of the lifting cylinders 604 is the same as the lifting height of the second lifting driving member 201.

[0053] A first slide rail 104 perpendicular to the mounting base plate 601 is provided in the hollow cavity of the frame 10. The number of the first slide rails 104 is two. The two first slide rails 104 are parallelly arranged and connected to the frame 10. A first slider 105 is slidably arranged on each of the two first slide rails 104. The turntable clamping member 50 is installed on the two first sliders 105 and moves up and down with the first sliders 105. The turntable 30 can be clamped and lifted and moved by the turntable clamping member 50.

[0054] Specifically, referring to Figures 7 to 10 , an annular step block adapted to the outer contour shape of the turntable 30 is provided at the lower part of the turntable clamping member 50. There are two symmetric annular step blocks, and the two annular step blocks can move radially relative to the turntable clamping member 50, so as to meet the radial contraction when clamping the turntable 30 and the radial expansion when loosening the turntable 30. A strip hole is provided on the turntable clamping member 50. The annular step block is slidably clamped in the strip hole of the turntable clamping member 50. The annular step block can only expand or contract radially relative to the turntable clamping member 50 and cannot perform other-direction movements.

[0055] A rotary driving member 501 for driving the rotary table 30 to rotate is further installed on the rotary table clamping member 50. In this embodiment, the rotary driving member 501 is a servo motor. A driving gear ring 504 is fixedly sleeved on the output shaft of the servo motor. The tooth grooves of the driving gear ring 504 are located on the outer wall surface of itself.

[0056] A through groove penetrating the upper and lower surfaces of itself is further formed in the middle of the rotary table clamping member 50. A connecting ring block 503 is fixed on the edge of the through groove. The connecting ring block 503 is circular. An arc-shaped rolling groove is arranged on the inner wall of the connecting ring block 503. One end of the pressing block 502 is a disc, and the other end is a cylinder. The cylinder is connected to the disc. An outer arc groove is arranged on the outer wall surface of the cylinder. The outer arc groove is adapted to the arc-shaped rolling groove on the inner wall of the connecting ring block 503. The cylinder end of the pressing block 502 is inserted into the inside of the connecting ring block 503. At the same time, a plurality of balls are arranged in the arc-shaped rolling groove and the outer arc groove. The connecting ring block 503 and the pressing block 502 are connected together by the balls, and the pressing block 502 can rotate relative to the connecting ring block 503. A driven gear ring 505 is also fixedly sleeved on the cylinder wall surface of the pressing block 502. The tooth grooves of the driven gear ring 505 are located on the outer wall surface of itself, and the driven gear ring 505 meshes with the driving gear ring 504. When the servo motor works, it drives the driving gear ring 504 to rotate. The driving gear ring 504 drives the driven gear ring 505 meshing with it to rotate. The driven gear ring 505 drives the pressing block 502 to rotate. The pressing block 502 is in contact with the rotary table 30, so as to drive the rotary table 30 to rotate.

[0057] A pin 5021 is arranged on the disc of the pressing block 502, and a pin hole 302 is arranged on the rotary table 30. The pin 5021 is adapted to the pin hole 302. After the pin 5021 is inserted into the pin hole 302, the pressing block 502 and the rotary table 30 will not rotate relative to each other, so as to drive the rotary table 30 to rotate more stably, which is beneficial to improving the accuracy of detecting the end jump value of the workpiece 70.

[0058] A through hole penetrating both side surfaces is arranged in the middle of the pressing block 502. Since the pressing rod 401 needs to apply an axial pressure to the middle of the rotary table 30, the pressing rod 401 needs to pass through the through groove of the rotary table clamping member 50 and the through hole of the pressing block 502 in sequence. The pressing rod 401 can move axially along the through groove and the through hole, and the pressing rod 401 is not affected by the rotation of the pressing block 502.

[0059] It should be mentioned that the rotary table clamping member 50, the pressing block 502 connected to the rotary table clamping member 50, and the servo motor are driven to move by the first lifting driving member 101.

[0060] Specifically, referring again to Figure 3, the turntable clamping member 50 is connected to the connecting block body 103, the connecting block body 103 is connected to the telescopic rod 102, and the telescopic rod 102 is connected to the first lifting driving member 101. When the first lifting driving member 101 works, the telescopic rod 102 moves up and down, driving the turntable clamping member 50 to move up and down. The first lifting driving member 101 can be a cylinder or a hydraulic cylinder, and the telescopic rod 102 is a piston rod. Of course, the first lifting driving member 101 and the telescopic rod 102 can be replaced by a push rod motor.

[0061] The axial pressure applying member 40 is installed on the upper table of the frame 10. A pressure rod 401 is connected to the lower output end of the axial pressure applying member 40. The axial pressure applying member 40 drives the pressure rod 401 to apply pressure to the lower turntable 30. Specifically, a second slider 106 is further slidably arranged on the first slide rail 104. A positioning plate 107 is connected to the second slider 106. The pressure rod 401 is connected to the positioning plate 107. When the axial pressure applying member 40 drives the pressure rod 401 to move downward, the positioning plate 107 moves downward along the first slide rail 104 with the second slider 106, and the pressure rod 401 contacts and applies pressure to the turntable 30, ensuring the stability of the pressure application.

[0062] In this embodiment, the axial pressure applying member 40 is a cylinder or a hydraulic cylinder, and the pressure rod 401 is aligned with the central part of the turntable 30 so that the applied pressure acts uniformly on the turntable 30.

[0063] Reference Figure 11 And Figure 12 , in order to conveniently detect the end run value of the workpiece 70, a position sensor 109 and a displacement sensor 108 are arranged on the frame 10. The position sensor 109 can detect the position movement parameters of the turntable 30 before detection, and the displacement sensor 108 can detect the axial displacement of the workpiece 70 during detection to measure the end run value of the workpiece 70. In this embodiment, the models of the position sensor 109 and the displacement sensor 108 are not limited, as long as the accuracy required for detection is satisfied.

[0064] It should be noted that the upper, lower, left, right and other orientation descriptions in this embodiment are based on the shown drawings. When the drawings rotate or are inverted, the relative orientations of the components will also change accordingly.

[0065] The end runout detection device of the present utility model is provided with a frame 10, a placement table 20, a turntable 30, an axial pressing member 40 and a pressing rod 401. The placement table 20 is arranged on the frame 10, and the turntable 30 is arranged opposite to the placement table 20. The placement table 20 is used for placing the workpiece 70. A limiting groove 301 is arranged in the middle of the turntable 30, and the limiting groove 301 is used for clamping the workpiece 70. The turntable 30 drives the workpiece 70 to rotate synchronously for end runout detection. The axial pressing member 40 is installed on the frame 10, and the pressing rod 401 is connected to the axial pressing member 40. The axial pressing member 40 and the pressing rod 401 are used for axially pressing the turntable 30, so that the turntable 30 presses the workpiece 70 tightly, avoiding axial displacement of the workpiece 70 during rotation. This end runout detection device improves the accuracy of detecting the end runout value of the workpiece 70 by applying pressure axially to the turntable 30.

[0066] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. An end jump detection device, characterized in that, Comprising: A frame (10); And A placement table (20), the placement table (20) is arranged on the frame (10), and the placement table (20) is used for placing a workpiece (70); A turntable (30), the turntable (30) is arranged opposite to the placement table (20), a limiting groove (301) is arranged in the middle of the turntable (30), the limiting groove (301) is used for clamping the workpiece (70), and the turntable (30) drives the workpiece (70) to rotate synchronously; An axial pressing member (40) and a pressing rod (401), the axial pressing member (40) is installed on the frame (10), the pressing rod (401) is connected to the axial pressing member (40), and the axial pressing member (40) and the pressing rod (401) are used for axially pressing the turntable (30).

2. The end jump detection device according to claim 1, characterized in that The end run detection device further includes a turntable clamping member (50), a pressing block (502) and a rotation driving member (501), the rotation driving member (501) is connected to the turntable clamping member (50), and the rotation driving member (501) drives the pressing block (502) to rotate; the pressing block (502) is rotatably connected to the turntable clamping member (50), and the pressing block (502) is movably connected to the turntable (30).

3. The end jump detection device according to claim 2, wherein A pin hole (302) is arranged on the turntable (30), a plug pin (5021) is arranged on the pressing block (502), and the plug pin (5021) is adapted to the pin hole (302).

4. The end jump detection device according to claim 2, wherein, A first slide rail (104) is arranged on the frame (10), a first slide block (105) is slidably arranged on the first slide rail (104), and the turntable clamping member (50) is installed on the first slide block (105).

5. The end jump detection device according to claim 4, characterized in that, A second slide block (106) is slidably arranged on the first slide rail (104), a positioning plate (107) is connected to the second slide block (106), and the pressing rod (401) is connected to the positioning plate (107).

6. The end jump detection device according to claim 2, characterized in that, A first lifting driving member (101) is arranged on the frame (10), and the first lifting driving member (101) is connected to the turntable clamping member (50).

7. The end jump detection device according to claim 1, characterized in that, A second lifting driving member (201) and a lifting rod (202) are further arranged on the frame (10), one end of the lifting rod (202) is connected to the second lifting driving member (201), and the other end of the lifting rod (202) is connected to the placement table (20).

8. The end jump detection device according to claim 2, characterized in that, A through hole penetrating both side surfaces is arranged in the middle of the pressing block (502), and the pressing rod (401) can move along the through hole.

9. The end jump detection device according to claim 1, characterized in that A position sensor (109) for detecting the position of the turntable (30) is arranged on the frame (10).

10. The end jump detection device according to any one of claims 1 to 9, characterized in that, A displacement sensor (108) for detecting the axial displacement of the turntable (30) is arranged on the frame (10).

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