Multifunctional glass measuring device calibrating device

Abstract

The utility model discloses a multifunctional glass measuring vessel calibrating device, and belongs to the technical field of glass measuring vessel calibration. The device comprises a rack, a first verification mechanism and a second verification mechanism, a control mechanism is arranged on the rack, a purified water supply mechanism is arranged in the rack, and the first verification mechanism and the second verification mechanism are both arranged on the rack and connected with the purified water supply mechanism through pipelines; the first verification mechanism comprises an up-down opening type glass measuring vessel installation frame and a liquid passing pipe, the up-down opening type glass measuring vessel installation frame is provided with a mechanical arm and a machine vision liquid level detection assembly A. The liquid passing pipe is sequentially provided with a valve A, a vertical pipe, a standard flow meter A and a valve B from the liquid outlet end to the liquid inlet end. A transparent connector is arranged at the end, away from the liquid passing pipe, of the vertical pipe. And the tightness, the outflow time and the capacity indicating value of glass measuring vessels with upper and lower openings such as burettes and the like can be calibrated, and the practicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to a multifunctional glass measuring instrument calibration device, belonging to the technical field of glass measuring instrument calibration. Background Art

[0002] Commonly used glass measuring instruments are precision liquid measuring instruments and are widely used in various analytical experiments. Whether their values ​​are reliable directly affects the accuracy of analytical test results. To ensure accurate liquid measurement, they need to be manually tested based on the measurement method. This is currently the most reliable and accurate verification method. However, the low efficiency of manual testing makes the verification process of glass measuring instruments slow and unable to meet production needs. In addition, manual testing is prone to errors, resulting in low verification accuracy.

[0003] To this end, a Chinese patent document with publication number CN110940397A discloses a multifunctional automatic calibration device and calibration method for a glass measuring instrument, comprising: a first calibration station for calibrating a first glass measuring instrument, the first calibration station comprising: a first water reservoir, a peristaltic pump, a sealing valve connected to the peristaltic pump and located above the first water reservoir, a first photoelectric sensor for sensing the highest and lowest measuring liquid levels of the first glass measuring instrument, and a second photoelectric sensor; a second calibration station for calibrating a second glass measuring instrument and located on one side of the first calibration station, the second calibration station comprising: a first water reservoir, a peristaltic pump, a sealing valve connected to the peristaltic pump and located above the first water reservoir, a first photoelectric sensor for sensing the highest and lowest measuring liquid levels of the first glass measuring instrument, and a second photoelectric sensor; The device includes: a second water tank, a water inlet pump, a water inlet pipe connecting the second water tank and the water inlet pump, a solenoid valve arranged at the outlet end of the water inlet pipe, a weighing piece arranged below the outlet end of the water inlet pipe, and a third photoelectric sensor for sensing the highest measuring liquid level of the second glass measuring vessel; a first lifting mechanism for controlling the vertical lifting of the first glass measuring vessel and the outlet end of the water inlet pipe; a second lifting mechanism for controlling the vertical lifting of the sealing valve; a lower computer for collecting data and transmitting control signals; and an upper computer for sending control signals and obtaining data collected by the lower computer and determining the calibration results. It can realize the outflow time and capacity indication calibration of commonly used glass measuring vessels with upper and lower opening structures, and realize the capacity indication calibration of commonly used glass measuring vessels with single-port structures.

[0004] However, according to "JJG196-2006 Calibration Procedure for Commonly Used Glass Volumetric Instruments", for burettes with upper and lower opening structures, the parameters that need to be calibrated include not only the outflow time and capacity indication, but also the tightness. The above-mentioned calibration device cannot achieve tightness calibration. Therefore, the practicality of the calibration device needs to be further improved. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a multifunctional glass measuring instrument calibration device.

[0006] The utility model is realized through the following technical solutions:

[0007] A multifunctional glass measuring instrument calibration device comprises a frame, a first calibration mechanism and a second calibration mechanism, wherein the frame is provided with a control mechanism, the frame is provided with a pure water supply mechanism, the first calibration mechanism and the second calibration mechanism are both provided on the frame and are connected to the pure water supply mechanism through pipelines respectively;

[0008] The first calibration mechanism includes an upper and lower open glass measuring vessel mounting frame and a liquid flow tube. The upper and lower open glass measuring vessel mounting frame is provided with a manipulator and a machine vision liquid level detection component A. The liquid flow tube is provided with a valve A, a vertical pipe, a standard flow meter A and a valve B in sequence from the liquid outlet end to the liquid inlet end. A transparent joint is provided on the end of the vertical pipe away from the liquid flow tube.

[0009] The pure water supply mechanism includes a water purifier and a constant temperature liquid storage tank. The liquid inlet of the constant temperature liquid storage tank is connected to the liquid outlet of the water purifier through an infusion pipe, and a water pump is installed on the infusion pipe. A liquid supply pipe is provided at the liquid outlet of the constant temperature liquid storage tank, and a circulation pump is installed on the liquid supply pipe.

[0010] The pure water supply mechanism further comprises a liquid return hopper which is mounted on the frame and the bottom of which is connected to the water purifier via a hose A.

[0011] The liquid outlet of the liquid pipe is connected to the water purifier through the liquid return pipe, and the liquid inlet is connected to the liquid supply pipe through the liquid inlet pipe A. Both valve A and valve B are electric ball valves.

[0012] The upper and lower opening type glass measuring instrument mounting frame comprises a calibration bracket and a pipe clamp mounted on the calibration bracket.

[0013] The machine vision liquid level detection component A includes a linear module A and a camera A, and the camera A is arranged on the linear module A.

[0014] The control mechanism comprises a computer, a controller and a timer. The controller is electrically connected to the computer, and the timer is electrically connected to the controller.

[0015] The second calibration mechanism includes a support frame, a machine vision liquid level detection component B, a single-port glass measuring vessel fixture and a liquid outlet pipe. The support frame and the single-port glass measuring vessel fixture are both arranged on the frame. The machine vision liquid level detection component B is arranged on the side of the support frame facing the single-port glass measuring vessel fixture. The liquid outlet pipe is installed on the support frame. The liquid outlet of the liquid outlet pipe faces downward and is located directly above the single-port glass measuring vessel fixture. A standard flow meter B is installed on the liquid outlet pipe near the liquid outlet, a valve C is installed near the liquid inlet, and the liquid inlet end of the liquid outlet pipe is connected to the pure water supply mechanism through a hose B.

[0016] The support frame includes a base, a vertical rod and a horizontal rod. The vertical rod is arranged on the base. One end of the horizontal rod is connected to the vertical rod, and the other end is connected to the liquid outlet pipe. The machine vision liquid level detection component B includes a linear module B and a camera B arranged on the linear module B. The valve C is an electric ball valve.

[0017] The single-port glass measuring device fixture comprises a supporting platform and an electric cylinder. A multi-claw chuck is arranged on the top of the supporting platform, and a plurality of guide shafts are arranged side by side on the bottom and are slidably connected to a frame. The electric cylinder is arranged on the frame and connected to the bottom of the supporting platform.

[0018] The beneficial effects of the utility model are as follows: overall control is performed by a control mechanism, the upper and lower open glass measuring vessel is fixedly mounted by an upper and lower open glass measuring vessel mounting frame, and the lower end of the upper and lower open glass measuring vessel is connected to a transparent joint, a pure water supply mechanism supplies pure water to a liquid passing pipe, a vertical pipe and the upper and lower open glass measuring vessel through a pipeline, and can recover the pure water in the liquid passing pipe, the vertical pipe and the upper and lower open glass measuring vessel, the lower end of the upper and lower open glass measuring vessel is controlled to be on and off by a manipulator, and the liquid level in the upper and lower open glass measuring vessel or whether there is pure water leakage in the upper and lower open glass measuring vessel is observed by a machine vision liquid level detection component A, so that the tightness, outflow time and capacity indication of upper and lower open glass measuring vessels such as burettes can be verified, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] In the figure: 1-frame, 2-circulation pump, 3-constant temperature liquid storage tank, 4-water delivery pump, 5-water purifier, 6-return liquid bucket, 7-liquid pipe, 8-valve A, 9-vertical pipe, 10-transparent joint, 11-upper and lower opening glass measuring vessel, 12-camera A, 13-linear module A, 14-calibration bracket, 15-pipe clamp, 16-manipulator, 17-standard flow meter A, 18-valve B, 19-controller, 20-computer, 21-timer, 22-valve C, 23-liquid outlet pipe, 24-cross bar, 25-vertical bar, 26-standard flow meter B, 27-linear module B, 28-camera B, 29-multi-claw chuck, 30-support platform, 31-guide shaft, 32-electric cylinder, 100-first calibration mechanism, 200-control mechanism, 300-second calibration mechanism, 400-pure water supply mechanism. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0022] like Figure 1As shown, a multifunctional glass measuring instrument calibration device according to the utility model comprises a frame 1, a first calibration mechanism 100 and a second calibration mechanism 300, wherein the frame 1 is provided with a control mechanism 200, and the frame 1 is provided with a pure water supply mechanism 400, wherein the first calibration mechanism 100 and the second calibration mechanism 300 are both provided on the frame 1 and are respectively connected to the pure water supply mechanism 400 through pipelines;

[0023] The first calibration mechanism 100 includes an upper and lower open glass measuring vessel mounting frame and a liquid flow tube 7, the upper and lower open glass measuring vessel mounting frame is provided with a manipulator 16 and a machine vision liquid level detection component A, the liquid flow tube 7 is provided with a valve A8, a vertical pipe 9, a standard flow meter A17 and a valve B18 in sequence from the liquid outlet end to the liquid inlet end, and a transparent joint 10 is provided on the end of the vertical pipe 9 away from the liquid flow tube 7. When in use, the upper and lower open glass measuring vessel is a pipette, a burette, etc., which is generally controlled by the control mechanism 200. The upper and lower open glass measuring vessel 11 is fixedly mounted by the upper and lower open glass measuring vessel mounting frame, and the lower end of the upper and lower open glass measuring vessel 11 is connected to the transparent joint 10. The pure water supply mechanism 400 supplies pure water to the liquid passing pipe 7, the vertical pipe 9 and the upper and lower open glass measuring vessel 11 through the pipeline, and can recover the pure water in the liquid passing pipe 7, the vertical pipe 9 and the upper and lower open glass measuring vessel 11. The lower end of the upper and lower open glass measuring vessel 11 is controlled to be on and off by the manipulator 16, and the liquid level in the upper and lower open glass measuring vessel 11 or whether there is pure water leakage in the upper and lower open glass measuring vessel 11 is observed by the machine vision liquid level detection component A, so that the tightness, outflow time and capacity indication of the upper and lower open glass measuring vessel 11 such as the burette can be verified, thereby improving the practicality of the device.

[0024] The manipulator 16 adopts the manipulator disclosed in CN202320522635.2, CN202020792832.2, etc., which is the prior art and will not be described in detail here. The transparent joint 10 is a transparent rubber sealing sleeve, etc.

[0025] The pure water supply mechanism 400 includes a water purifier 5 and a constant temperature liquid storage tank 3. The liquid inlet of the constant temperature liquid storage tank 3 is connected to the liquid outlet of the water purifier 5 through a liquid infusion tube, and a water delivery pump 4 is installed on the liquid infusion tube. A liquid supply tube is provided at the liquid outlet of the constant temperature liquid storage tank 3, and a circulation pump 2 is installed on the liquid supply tube. The pure water in the water purifier 5 is pumped into the constant temperature liquid storage tank 3 by the water delivery pump 4, and the constant temperature pure water in the constant temperature liquid storage tank 3 is pumped into the first inspection mechanism 100 and the second inspection mechanism 300 by the circulation pump 2. The same set of pure water supply mechanism 40 is used to supply water to the first inspection mechanism 100 and the second inspection mechanism 300, which simplifies the device structure. The water purifier 5, the constant temperature liquid storage tank 3, the water delivery pump 4 and the circulation pump 2 are all electrically connected to the controller 19.

[0026] The pure water supply mechanism 400 further includes a liquid return hopper 6, which is mounted on the frame 1, and the bottom of the liquid return hopper 6 is connected to the water purifier 5 via a hose A. After the calibration of the single-mouth glass measuring vessel is completed, the water in the single-mouth glass measuring vessel can be poured into the liquid return hopper 6, and then the water enters the water purifier 5 through the hose A for purification, thereby realizing water recycling and reuse.

[0027] The liquid outlet of the liquid pipe 7 is connected to the water purifier 5 through the liquid return pipe, and the liquid inlet is connected to the liquid supply pipe through the liquid inlet pipe A. The valve A8 and the valve B18 are both electric ball valves. The valve A8 and the valve B18 are both electrically connected to the controller 19.

[0028] The upper and lower opening glass measuring instrument mounting frame comprises a calibration bracket 14 and a pipe clamp 15 mounted on the calibration bracket 14. When in use, the pipe clamp 15 adopts the pipe clamp in CN212732233U or CN207756178U, which is the prior art and will not be described in detail here.

[0029] The machine vision liquid level detection assembly A includes a linear module A13 and a camera A12, and the camera A12 is arranged on the linear module A13. When in use, the linear module A13 is electrically connected to the controller 19, the camera A12 is installed on a slider in the linear module A13, and the camera A12 is electrically connected to the computer 20.

[0030] The control mechanism 200 includes a computer 20 , a controller 19 and a timer 21 . The controller 19 is electrically connected to the computer 20 , and the timer 21 is electrically connected to the controller 19 .

[0031] The second calibration mechanism 300 includes a support frame, a machine vision liquid level detection component B, a single-port glass measuring vessel fixture and a liquid outlet pipe 23. The support frame and the single-port glass measuring vessel fixture are both arranged on the frame 1. The machine vision liquid level detection component B is arranged on the side of the support frame facing the single-port glass measuring vessel fixture. The liquid outlet pipe 23 is installed on the support frame. The liquid outlet of the liquid outlet pipe 23 faces downward and is located directly above the single-port glass measuring vessel fixture. A standard flow meter B26 is installed on the liquid outlet pipe 23 near the liquid outlet, and a valve C22 is installed near the liquid inlet. The liquid inlet end of the liquid outlet pipe 23 is connected to the pure water supply mechanism 400 through a hose B.

[0032] The support frame includes a base, a vertical rod 25 and a horizontal rod 24. The vertical rod 25 is arranged on the base. One end of the horizontal rod 24 is connected to the vertical rod 25, and the other end is connected to the liquid outlet pipe 23. The machine vision liquid level detection component B includes a linear module B27 and a camera B28 arranged on the linear module B27. The valve C22 is an electric ball valve. When in use, the linear module B27 is electrically connected to the controller 19, the camera B28 is installed on the slider in the linear module B27, and the camera B28 is electrically connected to the computer 20.

[0033] The single-port glass measuring instrument fixture comprises a supporting platform 30 and an electric cylinder 32. A multi-claw chuck 29 is provided on the top of the supporting platform 30, and a plurality of guide shafts 31 are arranged side by side at the bottom to be slidably connected with the frame 1. The electric cylinder 32 is arranged on the frame 1 and connected with the bottom of the supporting platform 30. When in use, the multi-claw chuck 29 is a three-claw chuck or a four-claw chuck, and the movable claws in the chuck are made of plastic, or a rubber pad is attached to the clamping surface of the movable claws to prevent the movable claws from clamping the single-port glass measuring instrument, which is a measuring cylinder, a measuring cup, etc.

[0034] The working principle or use process of the multifunctional glass measuring instrument calibration device described in the utility model is as follows:

[0035] 1. Verification of burette

[0036] The lower end of the burette to be tested is connected to the transparent joint 10 and fixed to the testing frame 14 by the tube clamp 15 .

[0037] 1) Fit test

[0038] The controller 19 issues a command to start measurement, and the manipulator 16 connects the burette to be tested with the transparent joint 10 (a. For the acid burette: the manipulator 16 rotates the straight-through piston of the burette to connect the burette to the transparent joint 10; b. For the alkali burette: the manipulator 16 squeezes the glass beads to connect the burette to the transparent joint 10), valves A8 and C22 are closed, valve B18 is opened, and the pure water drawn from the constant temperature liquid storage tank 3 by the circulation pump 2 is supplied to the burette through the liquid inlet pipe A, the liquid passing pipe 7, the vertical pipe 9 and the transparent joint, the linear module A13 drives the camera A12 to rise and fall, the camera A12 takes the image of the burette, and transmits the image to the computer 20, and the computer 20 transmits the image to the computer 20. After processing by the computer 20, the liquid level in the burette can be obtained. When the water injection volume increases to the highest mark of the burette, the manipulator 16 is used to make the burette under test and the water injection port in a cut-off state (a. For the acid burette: the manipulator 16 rotates the straight-through piston of the burette to make the burette under test and the transparent joint 10 in a cut-off state; b. For the alkaline burette: the manipulator 16 releases the glass bead to make the burette under test and the transparent joint 10 in a cut-off state), the valve B18 is closed, the valve A8 is opened, the excess pure water is drained, and then it is left to stand for 20 minutes. The linear module A13 drives the camera A12 to lift and shoot to monitor whether the burette under test has leakage, and transmits the information to the controller 19 to realize the tightness test of the burette.

[0039] 2) Outflow time verification

[0040] After completing the tightness parameter detection, the controller 19 issues an instruction to start measuring the outflow time parameter, and the manipulator 16 connects the burette to be tested with the transparent joint 10. At the same time, the timer 21 starts timing, and the pure water in the burette flows into the water purifier 5 through the transparent joint 10, the vertical pipe 9, the liquid pipe 7 and the return pipe in sequence, until the liquid level in the burette drops to the lowest mark, the timer 21 stops timing, and then the timer 21 transmits the time information to the controller 19 to realize the burette outflow time verification.

[0041] 3) Capacity indication verification

[0042] After the outflow time parameter detection is completed, the controller 19 issues an instruction to start measuring the capacity indication parameter, and the manipulator 16 is used to connect the burette to be tested with the water injection port. The circulating pump 2 draws pure water from the constant temperature liquid storage tank 3 and supplies it to the burette through the liquid inlet pipe A, the liquid flow pipe 7, the vertical pipe 9 and the transparent joint. The linear module A13 drives the camera A12 to move up and down. The camera A12 takes the image of the burette and transmits the image to the computer 20. After being processed by the computer 20, the liquid level in the burette can be obtained. When the liquid level in the burette rises to the intended measurement point, the standard flowmeter A17 transmits the actual flow information to the controller 19. After completing the capacity indication measurement of all the intended measurement points, the valve B18 is closed and the valve A8 is opened. The pure water in the burette flows into the water purifier 5 through the transparent joint 10, the vertical pipe 9, the liquid flow pipe 7 and the return pipe in turn, so that the pure water used for calibration can be recycled and reused. The controller 19 compares the actual flow difference detected by the standard flow meter A17 with the volume between the corresponding intended measuring points on the burette, thereby realizing the capacity indication verification.

[0043] 2. The outflow time verification and capacity indication verification of the pipette are similar to those of the burette.

[0044] 3. Verification of capacity indication of measuring cylinder and measuring cup

[0045] The measured instrument is fixed on the supporting platform 30 by the multi-claw chuck 29, and the electric cylinder 32 is started to make the bottle mouth of the measured instrument flush with the liquid outlet of the liquid outlet pipe 23. The controller 19 issues an instruction to start measuring the capacity indication parameter, the valve B18 is closed, and the valve C22 is opened. The pure water drawn from the constant temperature liquid storage tank 3 by the circulation pump 2 is injected into the measuring instrument through the hose B and the liquid outlet pipe 23. The linear module B27 drives the camera B28 to move up and down. The camera B28 takes the image of the measuring instrument and transmits the image to the computer 20. After being processed by the computer 20, the liquid level in the measuring instrument can be obtained. When the liquid level in the measuring instrument rises to the intended measuring point, the standard flow meter B26 transmits the actual flow information to the controller 19. After completing the capacity indication measurement of all the intended measuring points, the valve C22 is closed, and the water in the measuring instrument is poured into the return liquid bucket 6. The water in the return liquid bucket 6 enters the water purifier 5 through the hose A for purification, so as to realize water recycling and reuse. The controller 19 compares the actual flow difference detected by the standard flow meter B26 with the volume between the corresponding intended measuring points on the measuring instrument to achieve capacity indication verification.

Claims

1. A multifunctional glass measuring instrument calibration device, characterized in that: The invention comprises a frame (1), a first verification mechanism (100) and a second verification mechanism (300); the frame (1) is provided with a control mechanism (200); the frame (1) is provided with a pure water supply mechanism (400); the first verification mechanism (100) and the second verification mechanism (300) are both provided on the frame (1) and are respectively connected to the pure water supply mechanism (400) through pipelines; The first calibration mechanism (100) comprises an upper and lower open glass measuring vessel mounting frame and a liquid flow pipe (7), wherein the upper and lower open glass measuring vessel mounting frame is provided with a manipulator (16) and a machine vision liquid level detection assembly A, and the liquid flow pipe (7) is provided with a valve A (8), a vertical pipe (9), a standard flow meter A (17) and a valve B (18) in sequence from the liquid outlet end to the liquid inlet end, and a transparent joint (10) is provided on the end of the vertical pipe (9) away from the liquid flow pipe (7).

2. The multifunctional glass measuring instrument calibration device according to claim 1, characterized in that: The pure water supply mechanism (400) comprises a water purifier (5) and a constant temperature liquid storage tank (3); the liquid inlet of the constant temperature liquid storage tank (3) is connected to the liquid outlet of the water purifier (5) via a liquid infusion pipe, and a water infusion pump (4) is installed on the liquid infusion pipe; a liquid supply pipe is provided at the liquid outlet of the constant temperature liquid storage tank (3), and a circulation pump (2) is installed on the liquid supply pipe.

3. The multifunctional glass measuring instrument calibration device according to claim 2, characterized in that: The pure water supply mechanism (400) further comprises a liquid return hopper (6), which is mounted on the frame (1), and the bottom of the liquid return hopper (6) is connected to the water purifier (5) via a hose A.

4. The multifunctional glass measuring instrument calibration device according to claim 2, characterized in that: The liquid outlet of the liquid passage pipe (7) is connected to the water purifier (5) via a liquid return pipe, and the liquid inlet is connected to the liquid supply pipe via a liquid inlet pipe A; valve A (8) and valve B (18) are both electric ball valves.

5. The multifunctional glass measuring instrument calibration device according to claim 1, characterized in that: The upper and lower opening type glass measuring instrument mounting frame comprises a calibration bracket (14) and a pipe clamp (15) mounted on the calibration bracket (14).

6. The multifunctional glass measuring instrument calibration device according to claim 1, characterized in that: The machine vision liquid level detection component A comprises a linear module A (13) and a camera A (12), wherein the camera A (12) is arranged on the linear module A (13).

7. The multifunctional glass measuring instrument calibration device according to claim 1, characterized in that: The control mechanism (200) comprises a computer (20), a controller (19) and a timer (21); the controller (19) is electrically connected to the computer (20), and the timer (21) is electrically connected to the controller (19).

8. The multifunctional glass measuring instrument calibration device according to claim 1, characterized in that: The second calibration mechanism (300) comprises a support frame, a machine vision liquid level detection component B, a single-port glass measuring vessel fixture and a liquid outlet pipe (23). The support frame and the single-port glass measuring vessel fixture are both arranged on the frame (1). The machine vision liquid level detection component B is arranged on the support frame on a side facing the single-port glass measuring vessel fixture. The liquid outlet pipe (23) is installed on the support frame. The liquid outlet of the liquid outlet pipe (23) faces downward and is located directly above the single-port glass measuring vessel fixture. A standard flow meter B (26) is installed near the liquid outlet of the liquid outlet pipe (23). A valve C (22) is installed near the liquid inlet. The liquid inlet end of the liquid outlet pipe (23) is connected to the pure water supply mechanism (400) through a hose B.

9. The multifunctional glass measuring instrument calibration device according to claim 8, characterized in that: The support frame comprises a base, a vertical rod (25) and a horizontal rod (24), wherein the vertical rod (25) is arranged on the base, one end of the horizontal rod (24) is connected to the vertical rod (25), and the other end is connected to the liquid outlet pipe (23); the machine vision liquid level detection component B comprises a linear module B (27) and a camera B (28) arranged on the linear module B (27); and the valve C (22) is an electric ball valve.

10. The multifunctional glass measuring instrument calibration device according to claim 8, characterized in that: The single-mouth glass measuring instrument fixture comprises a supporting platform (30) and an electric cylinder (32); a multi-claw chuck (29) is provided on the top of the supporting platform (30); a plurality of guide shafts (31) are arranged side by side on the bottom and are slidably connected to a frame (1); the electric cylinder (32) is arranged on the frame (1) and is connected to the bottom of the supporting platform (30).

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