Metering instrument calibration equipment

Abstract

The invention discloses metering instrument calibration equipment, and relates to the technical field of metrological verification calibration, and the metering instrument calibration equipment comprises a bottom plate, a lifting frame is provided with a lifting assembly used for driving a lifting bracket to vertically slide, and a motor I is in driving connection with two symmetrically arranged telescopic transmission assemblies located in a transmission cover; an inner sleeve vertically corresponding to the outer threaded pipe is fixed to the lower end of the rotating sleeve, and a positioning assembly used for abutting against the side wall of the pipe boss is installed in the inner sleeve. According to the device, the transmission cover is driven by the arranged lifting frame to vertically move downwards, so that the positioning assembly can vertically move downwards and conduct self-adaptive clamping and positioning on a pipe boss, and the butt joint stability of an inner threaded pipe and an outer threaded pipe is greatly improved; the meshing transmission of the auxiliary gear, the transition gear and the main gear is not affected in the process of adjusting the positions of the two internal threaded pipes, flexible adjustment is achieved according to different intervals of the external threaded pipes, and verification operation of the gas meter is more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of metrology verification and calibration, in particular to a measuring instrument calibration device. Background Art

[0002] A gas meter is a metering instrument, specifically an instrument used to measure gas usage. Its main function is to accurately measure the amount of gas used by users, usually in cubic meters. The gas meter measures the gas flow through its internal mechanical structure or electronic sensor, providing accurate gas usage data to gas companies and users for fee settlement.

[0003] When verifying and calibrating the gas meter, the calibration operation can be performed through the standard meter method gas flow standard device. Specifically, a high-precision standard flow meter such as a turbine flow meter, a mass flow meter, etc. is connected in series with the gas meter to be tested in the same pipeline. The metering error of the gas meter to be tested is determined by comparing the gas flow rates passing through the standard flow meter and the gas meter to be tested in the same period of time. However, during the use of the existing calibration equipment, the air channel interface of the standard flow meter cannot be stably connected to the two external threaded pipe interfaces of the gas meter, and cannot be adaptively adjusted according to the spacing between the two external threaded pipes, which is not conducive to rapid and stable connection according to the differences in the positions of the inlet and outlet ports of different gas meters, resulting in unsatisfactory efficiency in the actual verification and calibration operations of the gas meter. For this reason, a meter calibration device is now provided to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a measuring instrument calibration device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A meter calibration device comprises a base plate, a support plate is vertically fixed on the base plate, a lifting bracket for carrying a gas meter is vertically slidably mounted on the support plate, the gas meter comprises two pipe bosses fixed on the top thereof, each pipe boss is mounted with an externally threaded pipe, a clamping assembly for elastically limiting the gas meter is mounted on the lifting bracket, a motor II is fixed on the support plate, a threaded column is coaxially fixed to the output shaft of the motor II, a lifting bracket vertically slidably mounted on the support plate is threadedly sleeved on the threaded column, a lifting assembly for driving the lifting bracket to vertically slide is mounted on the lifting bracket, a transmission cover is fixed on the top of the lifting bracket, a motor I is fixed on the top of the transmission cover, The motor I is driven and connected to two symmetrically arranged telescopic transmission components located in the transmission cover, and a connecting frame II is installed on each of the telescopic transmission components. A sliding frame is slidably installed on the transmission cover, and the connecting frame II is rotatably sleeved on the sliding frame. A rotating sleeve that is transmission-connected to the telescopic transmission component is rotatably installed in the sliding frame, and an internally threaded tube is vertically slidably installed in the rotating sleeve. A clamping strip that is slidably embedded in the inner wall of the rotating sleeve is fixed to the outer wall of the internally threaded tube, and a calibration pipe is installed on the top of the internally threaded tube through a rotating joint, and an inner sleeve vertically corresponding to the externally threaded tube is fixed to the lower end of the rotating sleeve, and a positioning component for abutting the side wall of the tube boss is installed in the inner sleeve.

[0007] As an improved solution of the present invention: the telescopic transmission assembly includes a connecting frame I and a transition gear rotatably installed on the connecting frame II at one end away from the sliding frame, a sub-gear meshing with the transition gear is fixedly sleeved on the rotating sleeve, a main gear driven to rotate by the motor I is meshed between the two sub-gears, and the main gear and the transition gear are respectively hinged at both ends of the connecting frame I.

[0008] As an improved solution of the present invention: a guide rod slidably extending to the outside of the transmission cover is fixed on the sliding frame, a traction spring is sleeved on the guide rod, and two ends of the traction spring are respectively fixed to the transmission cover and the sliding frame.

[0009] As an improved solution of the present invention: the positioning assembly includes a plurality of positioning clamps evenly installed on the inner sleeve along the circumferential direction, the positioning clamps slide radially through the side wall of the inner sleeve, the bottom of the positioning clamps is provided with an inner wedge surface vertically corresponding to the upper edge of the tube boss, an extension block is fixed on the positioning clamp, and a radial spring is fixed between the extension block and the inner sleeve.

[0010] As an improved solution of the present invention: the positioning assembly also includes an outer sleeve vertically slidably sleeved on the inner sleeve, the bottom of the outer sleeve vertically corresponds to the gas meter, a top plate is fixedly sleeved on the inner sleeve, a spring ring is fixed between the top plate and the outer sleeve, a plurality of push blocks corresponding to the positioning clamping blocks are fixed on the inner wall of the outer sleeve, and an outer wedge surface vertically corresponding to the push block is provided at the bottom of the positioning clamping block.

[0011] As an improved solution of the present invention: the clamping assembly includes a horizontal plate slidably mounted on the lifting bracket, the horizontal plate abuts against the surface of the gas meter, a connecting spring is fixed between the horizontal plate and the lifting bracket, a threaded rod is threadedly connected to the support plate, a push plate abuts against the gas meter is slidably mounted on the support plate, one end of the threaded rod is rotatably mounted on the push plate, and a hand wheel is coaxially fixed to the other end of the threaded rod.

[0012] As an improved solution of the present invention: the lifting assembly includes a rotating fork plate rotatably mounted on the support plate, a slide groove I is provided on the rotating fork plate, and a slide column I slidably mounted on the slide groove I is fixed to the side wall of the lifting bracket.

[0013] As an improved solution of the present invention: the lifting assembly also includes a slide groove II opened on the rotating fork plate, the slide groove II and the slide groove I are respectively located on both sides of the support plate, and a slide column II fixed on the lifting frame is slidably installed in the slide groove II.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention drives the transmission cover to move vertically downward through the lifting frame provided, so that the positioning component can move vertically downward and adaptively clamp and position the tube boss, which greatly improves the stability of the connection between the internal threaded tube and the external threaded tube. Under the action of the telescopic transmission component, the process of adjusting the positions of the two internal threaded tubes will not affect the meshing transmission of the auxiliary gear, the transition gear and the main gear, and flexible adjustment can be achieved according to different spacings between the external threaded tubes, which greatly improves the connection stability, connection efficiency and adjustment flexibility between the external threaded tube and the internal threaded tube, and the calibration operation of the gas meter is more efficient.

[0016] 2. When the lifting frame provided in the present invention drives the transmission cover to move vertically downward, the slide column II drives the rotating fork plate to rotate, and the rotating fork plate drives the slide column I to move upward, so that the lifting bracket drives the gas meter to move vertically upward, realizing the opposite movement of the external threaded pipe and the internal threaded pipe of the gas meter, greatly improving the docking efficiency of the external threaded pipe and the internal threaded pipe of the gas meter, and significantly improving the calibration operation efficiency of the gas meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 For the present invention Figure 1 Schematic diagram from a certain perspective;

[0019] Figure 3 It is a schematic diagram of the connection of the lifting bracket, the horizontal plate and the push plate in the present invention;

[0020] Figure 4 It is a schematic diagram of the connection of the threaded column, lifting frame and lifting assembly in the present invention;

[0021] Figure 5 It is a schematic diagram of the local structure of the present invention;

[0022] Figure 6 For the present invention Figure 5 Schematic diagram from a certain perspective;

[0023] Figure 7 For the present invention Figure 6 The enlarged schematic diagram of the middle A part;

[0024] Figure 8 For the present invention Figure 6 Schematic diagram of the local structure;

[0025] Fig. 9 It is a schematic diagram of the structure of the internal threaded tube, the inner sleeve and the positioning clamp block in the present invention;

[0026] Fig.10 It is a connection diagram of the positioning clamp block, the extension block, the radial spring and other components in the present invention.

[0027] In the figure: 1-bottom plate, 2-support plate, 3-lifting frame, 4-transmission cover, 5-gas meter, 6-tube boss, 7-external threaded pipe, 8-motor I, 9-lifting bracket, 10-cross plate, 11-rotating fork plate, 12-radial spring, 13-outer sleeve, 14-internal threaded pipe, 15-calibration pipe, 16-guide rod, 17-sliding column I, 18-threaded column, 19-motor II, 20-sliding column II, 21-hand wheel, 22-push plate, 2 3-connecting spring, 24-threaded rod, 25-extension block, 26-slideway I, 27-slideway II, 28-slide frame, 29-secondary gear, 30-rotating sleeve, 31-spring ring, 32-inner sleeve, 33-top plate, 34-transition gear, 35-connecting frame I, 36-main gear, 37-traction spring, 38-positioning clamp, 39-outer wedge surface, 40-push block, 41-inner wedge surface, 42-clip strip, 43-connecting frame II. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments:

[0029] Example 1

[0030] Please refer to the attached Figure 1 -Attached Fig.10 A meter calibration device comprises a base plate 1, a support plate 2 is vertically fixed on the base plate 1, a lifting bracket 9 for carrying a gas meter 5 is vertically slidably installed on the support plate 2, the gas meter 5 comprises two pipe bosses 6 fixed on the top thereof, each pipe boss 6 is installed with an external threaded pipe 7, a clamping assembly for elastically limiting the gas meter 5 is installed on the lifting bracket 9, a motor II19 is fixed on the support plate 2, a threaded column 18 is coaxially fixed to the output shaft of the motor II19, a lifting frame 3 vertically slidably installed on the support plate 2 is threadedly sleeved on the threaded column 18, a lifting assembly for driving the lifting bracket 9 to vertically slide is installed on the lifting frame 3, a transmission cover 4 is fixed on the top of the lifting frame 3, a motor I8 is fixed on the top of the transmission cover 4, and the motor I 8 is driven and connected with two symmetrically arranged telescopic transmission components located in the transmission cover 4, and a connecting frame II43 is installed on each telescopic transmission component. A sliding frame 28 is slidably installed on the transmission cover 4, and the connecting frame II43 is rotatably sleeved on the sliding frame 28. A rotating sleeve 30 that is transmission-connected to the telescopic transmission component is rotatably installed in the sliding frame 28, and an internal threaded tube 14 is vertically slidably installed in the rotating sleeve 30. A clamping strip 42 that is slidably embedded in the inner wall of the rotating sleeve 30 is fixed to the outer wall of the internal threaded tube 14, and a calibration pipe 15 is installed on the top of the internal threaded tube 14 through a rotating joint. An inner sleeve 32 vertically corresponding to the external threaded tube 7 is fixed to the lower end of the rotating sleeve 30, and a positioning component for abutting the side wall of the tube boss 6 is installed in the inner sleeve 32.

[0031] When the gas meter 5 is verified and calibrated by the present device, the gas meter 5 is placed on the lifting bracket 9, the gas meter 5 is elastically confined in the lifting bracket 9 by means of a clamping assembly, the verification pipe 15 is connected to a high-precision standard flow meter, and the calibration operation is performed by means of a standard meter method gas flow standard device.

[0032] The threaded column 18 is driven to rotate by the motor II19, and the threaded column 18 drives the lifting frame 3 to move vertically downward, so that the transmission cover 4 can move vertically downward. At this time, the positioning assembly moves downward and docks with the pipe boss 6, and the internal threaded tube 14 moves downward and docks with the external threaded tube 7. With the help of the telescopic transmission assembly, the internal threaded tube 14 is driven to rotate and threadedly connected with the external threaded tube 7, so as to realize the connection between the standard flow meter and the gas meter 5.

[0033] Specifically, the telescopic transmission assembly of the device includes a connecting frame I35 and a transition gear 34 rotatably mounted on the end of the connecting frame II43 away from the sliding frame 28, a sub-gear 29 meshing with the transition gear 34 is fixedly sleeved on the rotating sleeve 30, a main gear 36 driven to rotate by the motor I8 is meshed and connected between the two sub-gears 29, and the main gear 36 and the transition gear 34 are respectively hinged at both ends of the connecting frame I35. A guide rod 16 that slides and extends to the outside of the transmission cover 4 is fixed on the sliding frame 28, and a traction spring 37 is sleeved on the guide rod 16, and the two ends of the traction spring 37 are respectively fixed to the transmission cover 4 and the sliding frame 28.

[0034] The connecting frame I35 and the connecting frame II43 are set to rotate, so that the two sliding frames 28 can slide and adjust relative to the transmission cover 4 and realize the adjustment effect of the position of the internal threaded tube 14, so that the internal threaded tube 14 is vertically corresponding to the external threaded tube 7. In the above adjustment process, the main gear 36, the transition gear 34 and the sub-gear 29 can always maintain meshing transmission. After the internal threaded tube 14 and the external threaded tube 7 are docked, the motor I8 drives the main gear 36 to rotate, the main gear 36 drives the transition gear 34 to rotate, and the transition gear 34 drives the rotating sleeve 30 to rotate. The rotating sleeve 30 drives the internal threaded tube 14 to rotate through the clamping strip 42, so that the internal threaded tube 14 is screwed toward the external threaded tube 7. The above structural setting can adapt to different spacings between external threaded tubes 7, which greatly improves the universal applicability of the equipment, and the calibration operation process of the gas meter 5 is more convenient and efficient.

[0035] The positioning assembly of the device includes a plurality of positioning clamps 38 uniformly installed on the inner sleeve 32 along the annular direction, the positioning clamps 38 slide along the radial direction and penetrate the side wall of the inner sleeve 32, the bottom of the positioning clamps 38 is provided with an inner wedge surface 41 vertically corresponding to the upper edge of the tube boss 6, the extension block 25 is fixed on the positioning clamps 38, and a radial spring 12 is fixed between the extension block 25 and the inner sleeve 32. The positioning assembly also includes an outer sleeve 13 vertically slidably sleeved on the inner sleeve 32, the bottom of the outer sleeve 13 vertically corresponds to the gas meter 5, the top plate 33 is fixedly sleeved on the inner sleeve 32, a spring ring 31 is fixed between the top plate 33 and the outer sleeve 13, a plurality of push blocks 40 corresponding to the positioning clamps 38 are fixed on the inner wall of the outer sleeve 13, and the bottom of the positioning clamps 38 is provided with an outer wedge surface 39 vertically corresponding to the push blocks 40.

[0036] Through the above arrangement, when the inner sleeve 32 moves vertically downward, the inner sleeve 32 drives the positioning clamp 38 to move vertically downward, so that the inner wedge surface 41 at the bottom of the positioning clamp 38 abuts against the upper edge of the tube boss 6. At this time, the positioning clamp 38 is away from the center of the inner sleeve 32, and then the side wall of the positioning clamp 38 is clamped on the side wall of the tube boss 6, thereby realizing the automatic axis centering effect of the internal threaded tube 14, which greatly improves the docking efficiency, accuracy and stability of the internal threaded tube 14 and the external threaded tube 7.

[0037] After the lower end of the outer sleeve 13 abuts against the body of the gas meter 5, the outer sleeve 13 drives the push block 40 to move vertically upward, so that the push block 40 abuts against the outer wedge surface 39, that is, the push block 40 pushes the positioning clamp 38, so that after the internal threaded tube 14 and the external threaded tube 7 are threadedly connected, the positioning clamp 38 stably clamps the tube boss 6, thereby ensuring the connection stability of the internal threaded tube 14 and the external threaded tube 7, and ensuring the stability of the calibration process of the gas meter 5.

[0038] Example 2

[0039] Please refer to the attached Figure 1 -Attached Fig.10 On the basis of Example 1, in addition, the clamping assembly of the device includes a horizontal plate 10 slidably mounted on the lifting bracket 9, the horizontal plate 10 abuts against the surface of the gas meter 5, a connecting spring 23 is fixed between the horizontal plate 10 and the lifting bracket 9, a threaded rod 24 is threadedly connected to the support plate 2, a push plate 22 abutting against the gas meter 5 is slidably mounted on the support plate 2, one end of the threaded rod 24 is rotatably mounted on the push plate 22, and a hand wheel 21 is coaxially fixed to the other end of the threaded rod 24.

[0040] The gas meter 5 is clamped and limited by the cross plate 10 and the push plate 22. The threaded rod 24 can be driven to rotate by shaking the hand wheel 21. At this time, the threaded rod 24 drives the push plate 22 to move, thereby realizing the position adjustment of the gas meter 5 in the lifting bracket 9, which facilitates the accurate docking of the external threaded tube 7 with the internal threaded tube 14 after the longitudinal position is adjusted.

[0041] The lifting assembly of the device includes a rotating fork plate 11 rotatably mounted on the support plate 2, a slide groove I26 is provided on the rotating fork plate 11, and a slide column I17 slidably mounted on the slide groove I26 is fixed to the side wall of the lifting bracket 9. The lifting assembly also includes a slide groove II27 provided on the rotating fork plate 11, the slide groove II27 and the slide groove I26 are respectively located on both sides of the support plate 2, and a slide column II20 fixed on the lifting frame 3 is slidably installed in the slide groove II27.

[0042] During the vertical downward movement of the lifting frame 3, the internal threaded tube 14 moves vertically downward, and the lifting frame 3 drives the sliding column II20 to move vertically downward. The sliding column II20 slides relative to the sliding groove II27, so that the rotating fork plate 11 rotates and drives the sliding column I17 to move vertically upward with the help of the sliding groove I26. The sliding column I17 drives the lifting bracket 9 to move vertically upward, so that the gas meter 5 and the external threaded tube 7 thereon move vertically upward, that is, the external threaded tube 7 and the internal threaded tube 14 move toward each other, which greatly improves the docking effect between the two, and the calibration operation efficiency of the gas meter 5 is significantly improved.

[0043] To sum up, the present invention drives the transmission cover 4 to move vertically downward through the lifting frame 3, so that the positioning component can move vertically downward and adaptively clamp and position the tube boss 6, which greatly improves the stability of the docking between the internal threaded tube 14 and the external threaded tube 7. Under the action of the telescopic transmission component, the process of adjusting the positions of the two internal threaded tubes 14 will not affect the meshing transmission of the auxiliary gear 29, the transition gear 34 and the main gear 36, and flexible adjustment can be achieved according to different spacings between the external threaded tubes 7, which greatly improves the connection stability, docking efficiency and adjustment flexibility between the external threaded tube 7 and the internal threaded tube 14, and the calibration operation of the gas meter 5 is more efficient. When the lifting frame 3 provided in the present invention drives the transmission cover 4 to move vertically downward, the sliding column II20 drives the rotating fork plate 11 to rotate, and the rotating fork plate 11 drives the sliding column I17 to move upward, so that the lifting bracket 9 drives the gas meter 5 to move vertically upward, and the external threaded tube 7 and the internal threaded tube 14 of the gas meter 5 move toward each other, which greatly improves the docking efficiency of the external threaded tube 7 and the internal threaded tube 14 of the gas meter 5, and the calibration operation efficiency of the gas meter 5 is significantly improved.

[0044] It should be noted that although this specification is described according to the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The above embodiments only express the preferred implementation methods of the technical solution, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention of the technical solution. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations, improvements and substitutions can be made, which all belong to the protection scope of the present technical solution. The protection scope of the invention of the present technical solution shall be based on the attached claims.

Claims

1. A meter calibration device, comprising a base plate (1), a support plate (2) vertically fixed on the base plate (1), a lifting bracket (9) for carrying a gas meter (5) vertically slidably mounted on the support plate (2), the gas meter (5) comprising two pipe bosses (6) fixed on the top thereof, each pipe boss (6) being mounted with an externally threaded pipe (7), characterized in that: The lifting bracket (9) is provided with a clamping assembly for elastically limiting the gas meter (5); a motor II (19) is fixed on the support plate (2); a threaded column (18) is coaxially fixed to the output shaft of the motor II (19); a lifting frame (3) vertically slidably mounted on the support plate (2) is threadedly sleeved on the threaded column (18); a lifting assembly for driving the lifting bracket (9) to slide vertically is installed on the lifting frame (3); a transmission cover (4) is fixed on the top of the lifting frame (3); a motor I (8) is fixed on the top of the transmission cover (4); the motor I (8) is driven and connected to two symmetrically arranged telescopic transmission assemblies located in the transmission cover (4); each of the telescopic transmission assemblies is provided with a connecting frame II ( 43), a sliding frame (28) is slidably installed on the transmission cover (4), and a connecting frame II (43) is rotatably sleeved on the sliding frame (28). A rotating sleeve (30) which is transmission-connected to the telescopic transmission assembly is rotatably installed in the sliding frame (28), and an internal threaded tube (14) is vertically slidably installed in the rotating sleeve (30). A clamping strip (42) which is slidably embedded in the inner wall of the rotating sleeve (30) is fixed to the outer wall of the internal threaded tube (14), and a calibration pipe (15) is installed on the top of the internal threaded tube (14) through a rotating joint. An inner sleeve (32) which vertically corresponds to the external threaded tube (7) is fixed to the lower end of the rotating sleeve (30), and a positioning component for abutting the side wall of the tube boss (6) is installed in the inner sleeve (32).

2. A measuring instrument calibration device according to claim 1, characterized in that: The telescopic transmission assembly comprises a connecting frame I (35) and a transition gear (34) rotatably mounted on one end of the connecting frame II (43) away from the sliding frame (28); a secondary gear (29) meshing with the transition gear (34) is fixedly sleeved on the rotating sleeve (30); a main gear (36) driven to rotate by a motor I (8) is meshed between the two secondary gears (29); the main gear (36) and the transition gear (34) are respectively hinged at both ends of the connecting frame I (35).

3. A measuring instrument calibration device according to claim 2, characterized in that: A guide rod (16) is fixed on the sliding frame (28) and extends slidably to the outside of the transmission cover (4). A traction spring (37) is sleeved on the guide rod (16). Two ends of the traction spring (37) are respectively fixed to the transmission cover (4) and the sliding frame (28).

4. A measuring instrument calibration device according to claim 1, characterized in that: The positioning assembly comprises a plurality of positioning clamps (38) uniformly mounted on the inner sleeve (32) along the circumferential direction. The positioning clamps (38) slide radially through the side wall of the inner sleeve (32). The bottom of the positioning clamps (38) is provided with an inner wedge surface (41) vertically corresponding to the upper edge of the tube boss (6). An extension block (25) is fixed on the positioning clamps (38), and a radial spring (12) is fixed between the extension block (25) and the inner sleeve (32).

5. A measuring instrument calibration device according to claim 4, characterized in that: The positioning assembly also includes an outer sleeve (13) vertically slidably sleeved on the inner sleeve (32), the bottom of the outer sleeve (13) vertically corresponding to the gas meter (5), a top plate (33) fixedly sleeved on the inner sleeve (32), a spring ring (31) fixed between the top plate (33) and the outer sleeve (13), a plurality of push blocks (40) corresponding one to one with the positioning clamping blocks (38) fixed on the inner wall of the outer sleeve (13), and an outer wedge surface (39) vertically corresponding to the push blocks (40) is provided at the bottom of the positioning clamping blocks (38).

6. A measuring instrument calibration device according to claim 1, characterized in that: The clamping assembly comprises a transverse plate (10) slidably mounted on the lifting bracket (9), the transverse plate (10) abutting against the surface of the gas meter (5), a connecting spring (23) being fixed between the transverse plate (10) and the lifting bracket (9), a threaded rod (24) being threadedly connected to the support plate (2), a push plate (22) abutting against the gas meter (5) being slidably mounted on the support plate (2), one end of the threaded rod (24) being rotatably mounted on the push plate (22), and a hand wheel (21) being coaxially fixed to the other end of the threaded rod (24).

7. A measuring instrument calibration device according to claim 1, characterized in that: The lifting assembly comprises a rotating fork plate (11) rotatably mounted on the support plate (2), a slide groove I (26) being provided on the rotating fork plate (11), and a slide column I (17) slidably mounted on the slide groove I (26) being fixed to the side wall of the lifting bracket (9).

8. A measuring instrument calibration device according to claim 7, characterized in that: The lifting assembly also includes a slide groove II (27) provided on the rotating fork plate (11), wherein the slide groove II (27) and the slide groove I (26) are respectively located on two sides of the support plate (2), and a slide column II (20) fixed on the lifting frame (3) is slidably installed in the slide groove II (27).

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