Grinding machine for machining piston rod of oil cylinder

Abstract

The invention relates to the technical field of grinding machines, in particular to a grinding machine for machining a piston rod of an oil cylinder. A mounting table is arranged on the rack, and a polishing assembly is arranged on the mounting table; the adjusting mechanism comprises a lifting assembly, a first linear driving assembly and a second linear driving assembly; the lifting assembly is used for driving the mounting table to ascend and descend in the vertical direction. The first linear driving assembly and the second linear driving assembly are used for driving the mounting table to move in the X-axis direction and the Y-axis direction in the horizontal direction correspondingly. The rotating mechanism is arranged on the rack and used for controlling the piston rod to rotate. The function of flexibly adjusting the position of the grinding assembly is achieved, and when the grinding position is adjusted, the piston rod does not need to be moved, so that an operator can conveniently control the piston rod to rotate through the rotating mechanism to comprehensively grind the piston rod. The problem that rotation of a piston rod is affected when the grinding position of an existing grinding machine is adjusted is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding machines, in particular to a grinding machine for machining a piston rod of an oil cylinder. Background Art

[0002] To improve the surface quality of the cylinder piston rod and reduce wear, the piston rod surface requires grinding. However, existing grinding machines have a fixed processing position, requiring the operator to manually move the piston rod during grinding. However, manual adjustment accuracy is uncontrollable, and large piston rods are difficult to move, seriously affecting the grinding effect.

[0003] To this end, a Chinese patent with authorization announcement number CN222176970U discloses a precision centerless grinder for a piston rod, which starts a hydraulic rod to move the cross plate, which is limited by a limit rod and a limit sleeve, so that the cross plate drives the fixed plate to move, thereby driving the protective frame and the operating table to move and adjust. At the same time, the motor is started, the motor rotation drives the screw to rotate, the screw rotation drives the screw sleeve to move, and the screw sleeve movement drives the connecting plate to move up and down along the slide rod to adjust the height of the grinder. Through the same operation, the horizontal position of the grinder is adjusted, and the piston rod is grinded when it is adjusted to the appropriate position, replacing the adjustment method of the existing grinder, thereby achieving the effect of facilitating the grinding of the piston rod and being convenient for users to use.

[0004] However, existing grinding machines require adjusting the position of the piston rod during adjustment. However, to ensure thorough grinding of the piston rod, the piston rod's rotation needs to be controlled, and adjusting the piston rod's position affects the rotational drive of the piston rod, making this operation extremely inconvenient during actual machining. Summary of the Invention

[0005] In view of the above problems, a grinding machine for machining the piston rod of an oil cylinder is provided. The problem that the existing grinding machine affects the rotation of the piston rod when adjusting the grinding position is solved through a frame, an adjustment mechanism and a support mechanism.

[0006] In order to solve the problems of the existing technology, the present invention provides a grinding machine for processing the piston rod of an oil cylinder, comprising a frame, an adjusting mechanism and a rotating mechanism; a mounting platform is provided on the frame, and a grinding assembly is provided on the mounting platform; the adjusting mechanism comprises a lifting assembly, a first linear drive assembly and a second linear drive assembly; the lifting assembly is used to drive the mounting platform to rise and fall in the vertical direction; the first linear drive assembly and the second linear drive assembly are used to drive the mounting platform to move in the horizontal X-axis and Y-axis directions respectively; the rotating mechanism is arranged on the frame, and the rotating mechanism is used to control the rotation of the piston rod.

[0007] Preferably, the rotating mechanism includes a support platform and a rotating drive assembly; the support platform and the rotating drive assembly are both arranged on the frame; the support platform is used to carry the piston rod; and the rotating drive assembly is used to drive the piston rod on the support platform to rotate.

[0008] Preferably, rollers are rotatably provided on the support platform, and at least four rollers are provided, and the multiple rollers are evenly distributed on both sides of the support platform.

[0009] Preferably, the rotary drive assembly includes a third rotary driver, a turntable and a clamping block; the third rotary driver is arranged on the frame; the driving end of the third rotary driver is transmission-connected to the turntable; there are two clamping blocks, both of which are arranged on the turntable, and the turntable has a built-in linear drive for controlling the opening and closing of the two clamping blocks.

[0010] Preferably, an arc-shaped gasket is provided on the clamping block.

[0011] Preferably, a support and a control component for controlling the support to rise and fall in a vertical direction are provided on the frame; and the rotation drive component is arranged on the support.

[0012] Preferably, the control assembly includes a first bracket, a third screw and a rotating handle; the first bracket is set on the frame, and the support is installed on the first bracket so as to be liftable; the third screw is rotatably set on the first bracket, and the third screw is threadedly connected to the support; the rotating handle is connected to the third screw.

[0013] Preferably, a second bracket and a collection box are provided on the frame; the support platform is arranged on the second bracket; the collection box is located at the bottom of the second bracket, and a guide frame extending toward the collection box is provided on the second bracket.

[0014] Preferably, at least three universal wheels are provided at the bottom of the frame.

[0015] Preferably, a fourth screw rod is rotatably provided at the bottom of the frame, and a supporting foot is provided at the bottom of the fourth screw rod; an adjusting nut is sleeved on the fourth screw rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention utilizes a frame, an adjustment mechanism, and a support mechanism to flexibly adjust the position of the grinding assembly, thereby enabling the grinding of different workpiece locations. Furthermore, the adjustment mechanism drives the grinding assembly to move in multiple directions, enabling the machining of piston rods of varying sizes. Furthermore, the grinding position can be adjusted without moving the piston rod, allowing the operator to conveniently control the rotation of the piston rod through the rotation mechanism for comprehensive grinding. This solves the problem in existing grinders where adjusting the grinding position affects the rotation of the piston rod.

[0017] 2. This invention utilizes a support platform and a rotary drive assembly to achieve the function of driving the piston rod. The support platform supports the piston rod, and the rotary drive assembly drives the piston rod to rotate, thereby fully grinding the piston rod with the rotating grinding wheel. This achieves fully automated piston rod grinding, reduces manual intervention, improves process consistency, and stabilizes the grinding quality of the piston rod.

[0018] 3. The present invention realizes the function of controlling the lifting and lowering of the rotary drive assembly through a support and a control assembly. By adjusting the height of the rotary drive assembly, the rotary drive assembly can drive piston rods of different sizes to rotate. When driving the piston rod to rotate, it is necessary to make the axis of the mounting platform and the axis of the piston rod collinear, so that the piston rod can be stably driven to rotate when the clamping block is used to clamp the piston rod. To this end, a support and a control assembly for adjusting the height of the third rotary drive are provided. When placing the piston rod, the height of the support is adjusted by the control assembly. After the adjustment is completed, the piston rod is pushed to the mounting platform for clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of a grinding machine for machining a piston rod of an oil cylinder from a first perspective according to the present invention.

[0020] Figure 2 It is a three-dimensional schematic diagram of the mounting platform, grinding assembly, adjustment mechanism and rotating mechanism of the grinder for processing the piston rod of the oil cylinder according to the present invention.

[0021] Figure 3 It is a three-dimensional schematic diagram of the cooperation of the mounting platform, grinding assembly and adjustment mechanism of the grinder for processing the piston rod of the oil cylinder of the present invention.

[0022] Figure 4 It is a three-dimensional exploded schematic diagram of the mounting platform, grinding assembly and adjustment mechanism of the grinder for processing the piston rod of the oil cylinder according to the present invention.

[0023] Figure 5 It is a three-dimensional schematic diagram of the cooperation between the rotating mechanism and the piston rod of the grinding machine for machining the piston rod of the oil cylinder according to the present invention.

[0024] Figure 6 It is a three-dimensional schematic diagram of the rotating mechanism of the grinding machine for machining the piston rod of the oil cylinder according to the present invention.

[0025] Figure 7 It is a three-dimensional schematic diagram of a support and a control assembly of a grinder for machining a piston rod of an oil cylinder according to the present invention.

[0026] Figure 8 It is a three-dimensional schematic diagram of the cooperation between the second bracket and the collecting box of the grinder for processing the piston rod of the oil cylinder of the present invention.

[0027] Figure 9It is a perspective schematic diagram of a second viewing angle of the grinding machine for machining a piston rod of an oil cylinder according to the present invention.

[0028] Figure 10 The present invention Figure 9 A local enlarged schematic diagram of point A in the middle.

[0029] The numbers in the figure are: 1, frame; 11, mounting table; 12, grinding assembly; 13, second bracket; 131, guide frame; 14, collection box; 15, universal wheel; 16, fourth screw; 161, support foot; 162, adjusting nut; 2, adjustment mechanism; 21, lifting assembly; 211, lifting platform; 212, linear cylinder; 22, first linear drive assembly; 221, first slide; 222, first slide; 223, first rotary driver; 224, first screw; 23. Second linear drive assembly; 231. Second slide; 232. Second slide; 233. Second rotary driver; 234. Second screw; 3. Rotation mechanism; 31. Support platform; 311. Roller; 32. Rotation drive assembly; 321. Third rotary driver; 322. Turntable; 323. Clamp; 3231. Arc-shaped gasket; 33. Support; 34. Control assembly; 341. First bracket; 342. Third screw; 343. Rotation handle; 4. Piston rod. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1-Figure 4 : A grinding machine for processing the piston rod of an oil cylinder includes a frame 1, an adjusting mechanism 2 and a rotating mechanism 3; a mounting platform 11 is provided on the frame 1, and a grinding assembly 12 is provided on the mounting platform 11; the adjusting mechanism 2 includes a lifting assembly 21, a first linear drive assembly 22 and a second linear drive assembly 23; the lifting assembly 21 is used to drive the mounting platform 11 to rise and fall in the vertical direction; the first linear drive assembly 22 and the second linear drive assembly 23 are used to drive the mounting platform 11 to move in the horizontal X-axis and Y-axis directions respectively; the rotating mechanism 3 is arranged on the frame 1, and the rotating mechanism 3 is used to control the rotation of the piston rod 4.

[0032] The present invention utilizes the frame 1, adjustment mechanism 2, and rotation mechanism 3 to flexibly adjust the position of the grinding assembly 12, thereby enabling the grinding of different workpiece locations. Furthermore, the adjustment mechanism 2 drives the grinding assembly 12 in multiple directions, enabling the machining of piston rods 4 of varying sizes. Furthermore, the grinding position can be adjusted without moving the piston rod 4, allowing the operator to conveniently control the rotation of the piston rod 4 via the rotation mechanism 3 for comprehensive grinding. This solves the problem in existing grinding machines where the rotation of the piston rod 4 is affected by the grinding position adjustment.

[0033] The grinding assembly 12 includes a grinding wheel and a drive motor for driving the grinding wheel to rotate. The lifting assembly 21 includes a lifting platform 211 and a linear cylinder 212. The linear cylinder 212 is mounted on the frame 1, and the drive end of the linear cylinder 212 is connected to the lifting platform 211. The first linear drive assembly 22 includes a first slide 221, a first slide 222, a first rotary driver 223, and a first screw 224. The first slide 221 is mounted on the lifting platform 211, the first slide 222 is slidably mounted on the first slide 221, the first rotary driver 223 is mounted on the first slide 221, and the first screw 224 is rotatably mounted on the first slide 221. The first rotary driver 223 is used to drive the first screw 224 to rotate. The first screw 224 is threadedly connected to the first slide 222. The second linear drive assembly 23 includes a second slide 231, a second slide 232, a second rotary driver 233, and a second screw 234. The second slide 231 is mounted on the first slide 222. The second slide 232 is slidably mounted on the second slide 231. The second rotary actuator 233 is mounted on the second slide 231. The second screw 234 is rotatably mounted on the second slide 231. The second rotary actuator 233 is used to rotate the second screw 234. The second screw 234 is threadedly connected to the second slide 232. A controller for human-machine interaction is provided on the frame 1. The linear cylinder 212, the first rotary actuator 223, the second rotary actuator 233, and the rotary mechanism 3 are all electrically connected to the controller.

[0034] During grinding, the piston rod 4 is first mounted on the rotating mechanism 3, and then the piston rod 4 is driven to rotate by the rotating mechanism 3. The controller then sends a signal to the linear cylinder 212, the first rotary driver 223, and the second rotary driver 233. These drive the grinding wheel to contact the surface of the piston rod 4. The grinding wheel is then driven by the drive motor to rotate, grinding the surface of the piston rod 4 at high speed.

[0035] Reference Figure 1 、 Figure 2 and Figure 5: The rotating mechanism 3 includes a support platform 31 and a rotation drive assembly 32; the support platform 31 and the rotation drive assembly 32 are both arranged on the frame 1; the support platform 31 is used to carry the piston rod 4; the rotation drive assembly 32 is used to drive the piston rod 4 on the support platform 31 to rotate.

[0036] The present invention realizes the function of driving the piston rod 4 to rotate through the support platform 31 and the rotary drive assembly 32. The support platform 31 is used to support the piston rod 4, and the rotary drive assembly 32 is used to drive the piston rod 4 to rotate, so that the piston rod 4 is fully polished by the rotating grinding wheel. The full automation of the grinding of the piston rod 4 is achieved, which reduces manual intervention, improves processing consistency, and stabilizes the grinding quality of the piston rod 4. The rotary drive assembly 32 is electrically connected to the controller. During processing, the operator first places the piston rod 4 to be processed on the support platform 31, and then adjusts the position of the grinding assembly 12 through the adjustment mechanism 2. Then the controller sends a signal to the rotary drive assembly 32, and the rotary drive assembly 32 drives the piston rod 4 to rotate, and at the same time, the piston rod 4 is polished by the polishing assembly 12. In this process, the polishing position of the polishing assembly 12 is adjusted by the cooperation of the first linear drive assembly 22 and the second linear drive assembly 23, and then the piston rod 4 is fully polished.

[0037] Reference Figure 2 and Figure 5 : Rollers 311 are rotatably provided on the support platform 31 , and at least four rollers 311 are provided, and the multiple rollers 311 are evenly distributed on both sides of the support platform 31 .

[0038] The present invention supports the piston rod 4 by the roller 311. When the piston rod 4 is driven to rotate by the rotation drive assembly 32, the roller 311 rotates under the action of friction, and uses rolling friction instead of sliding friction to reduce the wear of the piston rod 4 and avoid strain during the rotation process that affects the surface quality of the piston rod 4.

[0039] Reference Figure 2 、 Figure 5 and Figure 6 : The rotation drive assembly 32 includes a third rotation driver 321, a turntable 322 and a clamping block 323; the third rotation driver 321 is arranged on the frame 1; the driving end of the third rotation driver 321 is transmission-connected to the turntable 322; there are two clamping blocks 323, both of which are arranged on the turntable 322, and the turntable 322 has a built-in linear driver for controlling the opening and closing of the two clamping blocks 323.

[0040] The present invention achieves the function of driving the piston rod 4 to rotate via a third rotary driver 321, a turntable 322, and a clamping block 323. The third rotary driver 321 is preferably a servo motor, and the linear driver built into the turntable 322 is preferably an electromagnet. The turntable 322 is electrically connected to a cable within the third rotary driver 321 via a slip ring. The electromagnet and the third rotary driver 321 cooperate to control the opening and closing of the clamping block 323 and the rotation of the turntable 322. When the operator places the piston rod 4 on the support platform 31, they push one end of the piston rod 4 toward the turntable 322. The linear driver built into the turntable 322 then tightens the two clamping blocks 323, which then clamp the piston rod 4. During the machining process, a controller sends a signal to the third rotary driver 321, which rotates the turntable 322, which in turn drives the piston rod 4 through the clamping blocks 323, thereby performing a comprehensive grinding process on the piston rod 4.

[0041] Reference Figure 6 : An arc-shaped gasket 3231 is provided on the clamping block 323.

[0042] The present invention realizes the function of increasing the contact area between the clamping block 323 and the piston rod 4 through the arc-shaped gasket 3231, thereby improving the clamping stability of the clamping block 323 on the piston rod 4, avoiding slipping between the clamping block 323 and the piston rod 4 in the process of driving the piston rod 4 to rotate, and improving the rotational stability of the piston rod 4. The arc-shaped gasket 3231 is made of rubber. During the grinding process, if slipping occurs between the clamping block 323 and the piston rod 4, it will cause some positions of the piston rod 4 to continue to grind, while some positions are not grinded, affecting the grinding uniformity of the piston rod 4. For this reason, an arc-shaped gasket 3231 is provided on the clamping block 323. When clamping, the arc-shaped gasket 3231 can increase the contact area with the piston rod 4, and further reduce the possibility of slipping through the anti-slip properties of the rubber.

[0043] Reference Figure 2 、 Figure 5 : The frame 1 is provided with a support 33 and a control component 34 for controlling the support 33 to rise and fall in the vertical direction; the rotation drive component 32 is arranged on the support 33.

[0044] The present invention realizes the function of controlling the lifting and lowering of the rotary drive assembly 32 through the support 33 and the control assembly 34. By adjusting the height of the rotary drive assembly 32, the rotary drive assembly 32 can drive piston rods 4 of different sizes to rotate. When driving the piston rod 4 to rotate, it is necessary to make the rotation axis of the mounting platform 11 coincide with the central axis of the piston rod 4, so that the piston rod 4 can be stably driven to rotate when the clamping block 323 is used to clamp the piston rod 4. To this end, a support 33 and a control assembly 34 for adjusting the height of the third rotary driver 321 are provided. When placing the piston rod 4, the height of the support 33 is adjusted by the control assembly 34. After the adjustment is completed, the piston rod 4 is pushed to the turntable 322 for clamping.

[0045] Reference Figure 2 、 Figure 4-Figure 7 : The control component 34 includes a first bracket 341, a third screw 342 and a rotating handle 343; the first bracket 341 is set on the frame 1, and the support 33 can be lifted and lowered on the first bracket 341; the third screw 342 is rotatably set on the first bracket 341, and the third screw 342 is threadedly connected to the support 33; the rotating handle 343 is sleeved on the third screw 342.

[0046] The present invention utilizes a first bracket 341, a third screw 342, and a rotating handle 343 to adjust the height of the support 33. The first bracket 341 is equipped with a guide rail for guiding the sliding movement of the support 33. The guide rail cooperates with the support 33 to control the direction of movement of the support 33. When replacing piston rods 4 of different sizes, the operator needs to adjust the height of the support 33 based on the size of the piston rod 4. The operator first rotates the rotating handle 343, which in turn rotates the third screw 342, which in turn moves the support 33, which is threadedly connected to it, thereby adjusting the height of the support 33 and the rotary drive assembly 32.

[0047] Reference Figure 8 : The frame 1 is provided with a second bracket 13 and a collection box 14; a support table 31 is provided on the second bracket 13; the collection box 14 is located at the bottom of the second bracket 13, and the second bracket 13 is provided with a guide frame 131 extending toward the collection box 14.

[0048] The present invention utilizes the second support 13, guide frame 131, and collection box 14 to collect grinding debris. During the grinding process, debris and dust are generated. Gravity forces the debris and dust to fall from the support table 31 and, guided by the guide frame 131, into the collection box 14. This facilitates centralized handling of the debris by the operator, optimizing the machining environment.

[0049] Reference Figure 9 and Figure 10 : At least three universal wheels 15 are provided at the bottom of the frame 1.

[0050] The present invention facilitates the operator's movement of the frame 1, thereby adjusting the position of the grinder, by utilizing the universal wheels 15. During operation, if the position of the frame 1 needs to be adjusted, the operator simply pushes the frame 1 and utilizes the rolling motion of the universal wheels 15 to move it. With conventional grinders, the operator must lift the grinder and then move it, which is time-consuming and laborious.

[0051] Reference Figure 1 、 Figure 9 and Figure 10 : A fourth screw rod 16 is rotatably provided at the bottom of the frame 1 , and a supporting foot 161 is provided at the bottom of the fourth screw rod 16 ; an adjusting nut 162 is sleeved on the fourth screw rod 16 .

[0052] The present invention realizes the function of stabilizing the position of the frame 1 through the fourth screw rod 16, the support foot 161 and the adjusting nut 162. Two adjusting nuts 162 are sleeved on each fourth screw rod 16, and the fourth screw rod 16 is vertically arranged on the bottom mounting plate of the frame 1, and the two adjusting nuts 162 are respectively located on the upper and lower sides of the mounting plate. After adjusting the position of the frame 1, the frame 1 needs to be fixed to avoid the situation where the frame 1 shifts during the processing and affects the processing quality. When fixing the frame 1, the operator rotates the adjusting nut 162 until the support foot 161 at the bottom of the fourth screw rod 16 abuts against the ground. And the fourth screw rod 16 is fixed by the two adjusting nuts 162 to prevent the frame 1 from moving under the action of external force during the processing.

[0053] The above embodiments merely represent one or more embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A grinding machine for machining piston rods of oil cylinders, characterized in that: It comprises a frame (1), an adjustment mechanism (2) and a rotating mechanism (3); A mounting platform (11) is provided on the frame (1), and a grinding assembly (12) is provided on the mounting platform (11); The adjustment mechanism (2) includes a lifting assembly (21), a first linear drive assembly (22), and a second linear drive assembly (23); The lifting assembly (21) is used to drive the mounting platform (11) to move up and down in a vertical direction; The first linear drive assembly (22) and the second linear drive assembly (23) are used to drive the mounting platform (11) to move along the X-axis and Y-axis directions in the horizontal direction, respectively; The rotating mechanism (3) is arranged on the frame (1), and the rotating mechanism (3) is used to control the rotation of the piston rod (4).

2. The grinding machine for machining the piston rod of an oil cylinder according to claim 1, characterized in that: The rotating mechanism (3) includes a support platform (31) and a rotating drive assembly (32); The support platform (31) and the rotary drive assembly (32) are both arranged on the frame (1); The support platform (31) is used to support the piston rod (4); The rotary drive assembly (32) is used to drive the piston rod (4) on the support platform (31) to rotate.

3. The grinding machine for machining the piston rod of an oil cylinder according to claim 2, characterized in that: Rollers (311) are rotatably provided on the support platform (31), and at least four rollers (311) are provided. The plurality of rollers (311) are evenly distributed on both sides of the support platform (31).

4. The grinding machine for machining the piston rod of an oil cylinder according to claim 2, characterized in that: The rotary drive assembly (32) includes a third rotary drive (321), a turntable (322), and a clamping block (323); The third rotary driver (321) is arranged on the frame (1); The driving end of the third rotary driver (321) is in transmission connection with the turntable (322); Two clamping blocks (323) are provided, and both clamping blocks (323) are arranged on the turntable (322), and the turntable (322) is built with a linear drive for controlling the opening and closing of the two clamping blocks (323).

5. The grinding machine for machining the piston rod of an oil cylinder according to claim 4, characterized in that: An arc-shaped gasket (3231) is provided on the clamping block (323).

6. The grinding machine for machining the piston rod of an oil cylinder according to claim 2, characterized in that: The frame (1) is provided with a support (33) and a control component (34) for controlling the support (33) to rise and fall in a vertical direction; The rotary drive assembly (32) is arranged on the support (33).

7. The grinding machine for machining the piston rod of an oil cylinder according to claim 6, characterized in that: The control assembly (34) includes a first bracket (341), a third screw (342) and a rotating handle (343); The first bracket (341) is arranged on the frame (1), and the support (33) is installed on the first bracket (341) in a manner that it can be raised or lowered; The third screw rod (342) is rotatably disposed on the first bracket (341), and the third screw rod (342) is threadedly connected to the support (33); The rotating handle (343) is sleeved on the third screw (342).

8. The grinding machine for machining the piston rod of an oil cylinder according to claim 2, characterized in that: A second bracket (13) and a collection box (14) are provided on the frame (1); The support platform (31) is arranged on the second bracket (13); The collection box (14) is located at the bottom of the second bracket (13), and the second bracket (13) is provided with a guide frame (131) extending toward the collection box (14).

9. The grinding machine for machining the piston rod of an oil cylinder according to claim 1, characterized in that: At least three universal wheels (15) are provided at the bottom of the frame (1).

10. The grinding machine for machining the piston rod of an oil cylinder according to claim 9, characterized in that: A fourth screw rod (16) is rotatably provided at the bottom of the frame (1), and a supporting foot (161) is provided at the bottom of the fourth screw rod (16); An adjusting nut (162) is sleeved on the fourth screw rod (16).

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