Automatic calibrating device for pressure gauge

Abstract

The utility model discloses an automatic calibrating device for a pressure gauge, and relates to the technical field of pressure gauge calibration. The device comprises a pressurizing table, a pressurizing cylinder is arranged on the pressurizing table, a piston rod is slidably arranged in the pressurizing cylinder, a reciprocating screw rod is rotatably arranged on the pressurizing table, a fixing block meshed with the reciprocating screw rod is arranged at the free end of the piston rod, and a knocking block in abutting lap joint with a pressure gauge is slidably arranged on the pressurizing table. A reset spring is arranged between the knocking block and the pressurizing table, the reciprocating lead screw is in linkage with the knocking block through a linkage piece, and in the rotating process of the reciprocating lead screw, the linkage piece drives the knocking block to slide in one direction. When the pressure gauge is calibrated, a calibrator does not need to frequently tap the pressure gauge for multiple times, the operation is convenient, the calibration efficiency is also improved, and the pressure gauge calibration device is more practical.

Description

Technical Field

[0001] The present application relates to the technical field of pressure gauge calibration, and in particular to an automatic calibration device for a pressure gauge. Background Art

[0002] A pressure gauge is an instrument that uses an elastic element as a sensitive element to measure and indicate pressures higher than the ambient pressure. It is widely used in industries such as industry, chemical industry, petroleum, natural gas, pharmaceuticals, and food. To ensure the accuracy and reliability of the pressure gauge, it is necessary to calibrate the pressure gauge. During the calibration, the pressure gauge is installed on a pressurized platform, and the pressure is gradually increased and decreased manually. The indicated value of the pressure gauge is recorded and compared with the standard value. The error of the indicated value is calculated, and the pressure gauge is tapped to check the displacement of the pointer. This method requires the calibrator to tap the pressure gauge frequently and multiple times, which is more troublesome to operate and also reduces the calibration efficiency. Therefore, an automatic calibration device for pressure gauges is proposed. Summary of the Invention

[0003] The purpose of this application is to provide an automatic pressure gauge calibration device to solve the technical problem that the calibration personnel need to tap the pressure gauge frequently and multiple times, which is troublesome to operate and also reduces the calibration efficiency.

[0004] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0005] A pressure gauge automatic calibration device includes a pressure platform, a pressure cylinder is provided on the pressure platform, a piston rod is slidably provided in the pressure cylinder, a reciprocating screw is rotatably provided on the pressure platform, a fixed block engaged with the reciprocating screw is provided at the free end of the piston rod, a knocking block that contacts and overlaps with the pressure gauge is slidably provided on the pressure platform, a reset spring is provided between the knocking block and the pressure platform, the reciprocating screw is linked to the knocking block through a linkage, and when the reciprocating screw rotates, the knocking block is driven to slide in one direction by the linkage.

[0006] Furthermore, the linkage part includes a rotating rod, an axle rod and a guide wheel, all of which are rotatably arranged on the pressure platform. The rotating rod is linked to the reciprocating screw through a transmission part. When the reciprocating screw rotates, the rotating rod is driven to rotate differentially through the transmission part. A linkage gear and a winding wheel are provided on the axle rod. A missing gear meshing with the linkage gear is provided on the rotating rod. A pull rope is wound around the winding wheel, and the free end of the pull rope passes around the guide and is connected to the knocking block.

[0007] Furthermore, the transmission member includes a first transmission gear arranged on the reciprocating screw rod, and the rotating rod is provided with a second transmission gear meshing with the first transmission gear, and the diameter of the second transmission gear is larger than the diameter of the first transmission gear.

[0008] Furthermore, a damping rubber block is provided between the knocking block and the pressurizing platform.

[0009] Furthermore, the pressure platform is provided with a limiting member that acts on the striking block and limits or releases the limiting member.

[0010] Furthermore, the limiting member includes a limiting groove provided on the knocking block, the pressure platform is hingedly connected to a limiting rod with a torsion spring provided therebetween, the limiting rod is plugged into and fitted in the limiting groove and overlaps with the knocking block.

[0011] Furthermore, the pressurizing platform is provided with a driving member that acts on the reciprocating screw and drives it to rotate intermittently.

[0012] Furthermore, the driving member includes a driving motor arranged on the pressure platform, a driving gear is provided on the output shaft of the driving motor, two rollers are rotatably provided on the driving gear, a fixed gear meshing with the driving gear is provided on the reciprocating screw, and a notch and a beaver tail plate with corresponding positions are provided on the fixed gear, and the beaver tail plate and the roller are rollingly overlapped.

[0013] The beneficial effects of this application are as follows:

[0014] When calibrating a pressure gauge, this application eliminates the need for the calibrator to tap the pressure gauge frequently and multiple times. This makes the operation convenient and the calibration efficiency improved, making it more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the structure of this application;

[0016] Figure 2 This application Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 It is a three-dimensional diagram of the structure of part of this application;

[0018] Figure 4 It is a three-dimensional diagram of another part of the structure of this application;

[0019] Figure 5 This application Figure 4 Enlarged view of point B in the middle.

[0020] Figure numerals: 1. Pressurizing platform; 2. Pressurizing cylinder; 3. Piston rod; 4. Reciprocating screw; 5. Fixed block; 6. Knocking block; 7. Return spring; 8. Turning rod; 9. Shaft; 10. Guide wheel; 11. Linkage gear; 12. Rope winding wheel; 13. Missing gear; 14. Pull rope; 15. First transmission gear; 16. Second transmission gear; 17. Damping rubber block; 18. Limiting groove; 19. Limiting rod; 20. Torsion spring; 21. Driving motor; 22. Driving gear; 23. Roller; 24. Fixed gear; 25. Notch; 26. Beaver tail plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0022] like Figure 1-Figure 4 As shown, an embodiment of the present application proposes an automatic calibration device for a pressure gauge, including a pressure platform 1, a pressure cylinder 2 is provided on the pressure platform 1, the pressure cylinder 2 is horizontal and fixed on the pressure platform 1, a piston rod 3 is slidingly provided in the pressure cylinder 2, the piston rod 3 slides in the horizontal direction and the free end passes through the pressure cylinder 2, a reciprocating screw 4 is rotatably provided on the pressure platform 1, the reciprocating screw 4 is horizontal, and the free end of the piston rod 3 is provided with a fixed block 5 engaged with the reciprocating screw 4, and the fixed block 5 is fixed to the free end of the piston rod 3 At the end, a knocking block 6 that contacts and overlaps with the pressure gauge is slidingly provided on the pressure platform 1. The knocking block 6 slides in the horizontal direction. A return spring 7 is provided between the knocking block 6 and the pressure platform 1. The return spring 7 is horizontally directed and its two ends are respectively fixedly connected to the knocking block 6 and the pressure platform 1. The reciprocating screw 4 is linked to the knocking block 6 through a linkage. When the reciprocating screw 4 rotates, the knocking block 6 is driven to slide in one direction through the linkage. The one-way sliding here refers to the knocking block 6 sliding to the limit position and forcing the return spring 7 to be squeezed;

[0023] In the initial state, the piston rod 3, the fixed block 5 and the knocking block 6 are all in the initial position, the fixed block 5 is away from the pressure cylinder 2, and the reset spring 7 is in the natural state. When the pressure gauge is calibrated, the pressure gauge is installed on the pressure platform 1, and the indication of the pressure gauge is zero, driving the reciprocating screw 4 to rotate, and the fixed block 5 will move close to the pressure cylinder 2 due to the meshing action, driving the piston rod 3 to slide to achieve pressurization. At the same time, the knocking block 6 is driven to slide to the limit position through the linkage and forces the reset spring 7 to be squeezed. When the indication of the pressure gauge is one, the reciprocating screw 4 stops rotating, the reset spring 7 is reset to the natural state, and the knocking block 6 slides. Move to the initial position and tap the pressure gauge, record the indicated value of the pressure gauge, and compare it with the standard value, calculate the error of the indicated value, check the displacement of the pointer to realize the single pressurization calibration operation of the pressure gauge, and then repeat the operation. The indicated value of the pressure gauge gradually increases. On the contrary, when the fixed block 5 moves away from the pressurizing cylinder 2, it drives the piston rod 3 to slide to realize decompression, and the indicated value of the pressure gauge gradually decreases. Since the pressure value of the pressure gauge for pressurization and decompression is the same, the number of turns of the reciprocating screw 4 in a single rotation is the same, and the stroke of each movement of the fixed block 5 is the same. When the pressure gauge calibration is completed, the pressure gauge is removed from the pressurizing platform 1;

[0024] In summary, the present application does not require the calibrator to tap the pressure gauge frequently and multiple times when calibrating the pressure gauge, which is convenient to operate and improves the calibration efficiency, and is therefore more practical.

[0025] like Figure 3-Figure 4 As shown, in some embodiments, the linkage includes a rotating rod 8, an axle 9 and a guide wheel 10, which are all rotatably arranged on the pressurizing platform 1. The rotating rod 8, the axle 9 and the guide wheel 10 are all in a horizontal direction. The rotating rod 8 is linked with the reciprocating screw 4 through a transmission member. When the reciprocating screw 4 rotates, the rotating rod 8 is driven by the transmission member to rotate differentially. The differential rotation here means that the reciprocating screw 4 rotates multiple circles and the rotating rod 8 rotates one circle. A linkage gear 11 and a rope winding wheel 12 are provided on the axle 9. The linkage gear 11 and the rope winding wheel 12 are both in a vertical direction and are both fixed on the axle 9. A missing gear 13 meshing with the linkage gear 11 is provided on the rotating rod 8. The missing gear 13 is in a vertical direction and is fixed on the rotating rod 8. A notch is constructed on the missing gear 13. A pull rope 14 is wound around the rope winding wheel 12. The free end of the pull rope 14 passes around the guide and is connected to the knocking block 6.

[0026] Referring to the above, in the initial state, the linkage gear 11 is not engaged with the missing gear 13, that is, the notch of the missing gear 13 corresponds to the linkage gear 11. When the reciprocating screw 4 rotates multiple times in a single turn, the rotating rod 8 is driven to rotate one circle through the transmission member. When the rotating rod 8 rotates, it drives the missing gear 13 to rotate together. The notch of the missing gear 13 is away from the linkage gear 11, that is, the missing gear 13 is engaged with the linkage gear 11. The linkage gear 11 rotates due to the meshing action and drives the shaft 9 and the rope wheel 12 to rotate together. The rope wheel 12 winds the pull rope 14 tightly, and the knocking block is pulled by the pull rope 14. 6 and drives it to slide to the extreme position, the return spring 7 is squeezed, and the pull rope 14 is guided and limited by the guide wheel 10. When the reciprocating screw 4 stops, the notch of the missing gear 13 corresponds to the linkage gear 11 again, and the linkage gear 11 is not engaged with the missing gear 13. The return spring 7 is reset to the natural state, and the knocking block 6 slides to the initial position and drives the pull rope 14 to move together. The pull rope 14 is guided and limited by the guide wheel 10, and the rope wheel 12 loosens the pull rope 14 to achieve one-way sliding of the knocking block 6 during the rotation of the reciprocating screw 4.

[0027] like Figure 4 As shown, in some embodiments, the transmission member includes a first transmission gear 15 provided on the reciprocating screw rod 4, the first transmission gear 15 is vertically oriented and fixedly provided on the reciprocating screw rod 4, and a second transmission gear 16 meshing with the first transmission gear 15 is provided on the rotating rod 8, the second transmission gear 16 is vertically oriented and fixedly provided on the rotating rod 8, and the diameter of the second transmission gear 16 is larger than the diameter of the first transmission gear 15;

[0028] Referring to the above, when the reciprocating screw 4 rotates multiple times in a single time, it drives the first transmission gear 15 to rotate the same number of times. At the same time, the second transmission gear 16 will rotate due to the meshing action and drive the rotating rod 8 to rotate together. Since the diameter of the second transmission gear 16 is larger than the diameter of the first transmission gear 15, the number of rotations of the second transmission gear 16 is less than the number of rotations of the first transmission gear 15, so that when the reciprocating screw 4 rotates, the rotating rod 8 is driven to rotate differentially, that is, the reciprocating screw 4 rotates multiple times and the rotating rod 8 rotates one circle.

[0029] like Figure 2 As shown, in some embodiments, a damping rubber block 17 is provided between the knocking block 6 and the pressurizing platform 1, and the damping rubber block 17 is fixed on the pressurizing platform 1;

[0030] Referring to the above, in the initial state, the knocking block 6 is located in the initial position and is in contact with and overlaps the damping rubber block 17. When the knocking block 6 slides to the extreme position, it will move away from the damping rubber block 17. When the knocking block 6 slides to the initial position, it will be in contact with and overlap with the damping rubber block 17 again. The knocking block 6 is buffered by the damping rubber block 17 to avoid damage to the pressure gauge due to excessive knocking force of the knocking block 6 on the pressure gauge.

[0031] like Figure 2 As shown, in some embodiments, the pressurizing platform 1 is provided with a limiting member that acts on the striking block 6 and limits or releases the limiting member;

[0032] Referring to the above, when the pressure gauge is installed on the pressurizing platform 1, the knocking block 6 is driven to slide to the limit position, the reset spring 7 is squeezed, and the knocking block 6 is limited by the limit piece. The reset spring 7 cannot be reset to the natural state, and the knocking block 6 cannot slide to the initial position, so as to facilitate the installation of the pressure gauge. When the pressure gauge is installed, the knocking block 6 is released from the limit by the limit piece, the reset spring 7 is reset to the natural state, and the knocking block 6 slides to the initial position. Conversely, when the pressure gauge is removed from the pressurizing platform 1, the above operation is repeated.

[0033] like Figure 2 As shown, in some embodiments, the limiting member includes a limiting groove 18 provided on the knocking block 6, the limiting groove 18 is U-shaped, a limiting rod 19 is hingedly connected to the pressurizing platform 1, and a torsion spring 20 is provided between the two, and the two ends of the torsion spring 20 are respectively fixedly connected to the pressurizing platform 1 and the limiting rod 19, and the limiting rod 19 is plugged into and matched with the limiting groove 18 and contacts and overlaps the knocking block 6;

[0034] Referring to the above, in the initial state, the limit rod 19 is in a vertical direction and the torsion spring 20 is in a natural state. When the knocking block 6 slides to the limit position, the limit rod 19 is driven to rotate to the horizontal direction, the torsion spring 20 is squeezed, and the limit rod 19 is plugged into the limit slot 18. Then the knocking block 6 is released, and the knocking block 6 will slide in the opposite direction for a short distance due to the elastic potential energy. The knocking block 6 and the limit rod 19 are in contact and overlapped, and the torsion spring 20 cannot be reset to the natural state, and the limit rod 19 cannot be rotated to the vertical direction to limit the knocking block 6. On the contrary, the knocking block 6 is driven to slide to the limit position and away from the limit rod 19, the torsion spring 20 is reset to the natural state, the limit rod 19 is rotated to the vertical direction and exits the limit slot 18, and finally the knocking block 6 is released to release the limit of the knocking block 6.

[0035] like Figure 4-Figure 5 As shown, in some embodiments, the pressurizing platform 1 is provided with a driving member that acts on the reciprocating screw 4 and drives it to rotate intermittently. The intermittent rotation here means that the reciprocating screw 4 stops for a period of time after each rotation and then continues to rotate.

[0036] With reference to the above, when in use, the reciprocating screw rod 4 is driven by the driving member to rotate intermittently, thereby making the operation more convenient.

[0037] like Figure 4-Figure 5 As shown, in some embodiments, the driving member includes a driving motor 21 provided on the pressurizing platform 1, the driving motor 21 is fixed on the pressurizing platform 1 and the output shaft is horizontal, a driving gear 22 is provided on the output shaft of the driving motor 21, the driving gear 22 is vertical and fixed on the output shaft of the driving motor 21, two rollers 23 are rotatably provided on the driving gear 22, both rollers 23 are horizontal and distributed in a circular array, a fixed gear 24 meshing with the driving gear 22 is provided on the reciprocating screw rod 4, the fixed gear 24 is vertical and fixed on the reciprocating screw rod 4, a notch 25 and a beaver tail plate 26 corresponding in position are provided on the fixed gear 24, the beaver tail plate 26 is fixed on the fixed gear 24, and the beaver tail plate 26 is rollingly overlapped with the roller 23;

[0038] Referring to the above, in the initial state, the reciprocating screw 4 stops rotating, the notch 25 and the beaver tail plate 26 are both facing the driving gear 22, the beaver tail plate 26 and the two rollers 23 are both rolling and overlapping, and the fixed gear 24 is not engaged with the driving gear 22. When in use, the drive motor 21 works, the output shaft rotates, driving the driving gear 22 and the two rollers 23 to rotate together, and the beaver tail plate 26 is driven to rotate through the two rollers 23, driving the fixed gear 24 to rotate and move the notch 25 away from the driving gear 22. The fixed gear 24 is engaged with the driving gear 22, driving the reciprocating screw 4 to rotate. When the fixed gear 24 rotates one circle, the notch 25 and the beaver tail plate 26 are both facing the driving gear 22, and the beaver tail plate 26 and the two rollers 23 are both rolling and overlapping. The fixed gear 24 is not engaged with the driving gear 22. Therefore, the reciprocating screw 4 will stop rotating for a period of time to achieve intermittent rotation of the reciprocating screw 4.

[0039] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure gauge automatic calibration device, comprising a pressure platform (1), a pressure cylinder (2) provided on the pressure platform (1), a piston rod (3) slidably provided in the pressure cylinder (2), characterized in that: A reciprocating screw (4) is rotatably provided on the pressurizing platform (1), a fixed block (5) meshing with the reciprocating screw (4) is provided at the free end of the piston rod (3), a knocking block (6) contacting and overlapping with the pressure gauge is slidably provided on the pressurizing platform (1), a return spring (7) is provided between the knocking block (6) and the pressurizing platform (1), the reciprocating screw (4) is linked to the knocking block (6) through a linkage, and when the reciprocating screw (4) rotates, the knocking block (6) is driven to slide in one direction through the linkage.

2. The pressure gauge automatic calibration device according to claim 1, characterized in that: The linkage member comprises a rotating rod (8), an axial rod (9) and a guide wheel (10) all of which are rotatably arranged on the pressurizing platform (1). The rotating rod (8) is linked to the reciprocating screw (4) through a transmission member. When the reciprocating screw (4) rotates, the rotating rod (8) is driven to rotate differentially through the transmission member. A linkage gear (11) and a rope winding wheel (12) are provided on the axial rod (9). A missing gear (13) meshing with the linkage gear (11) is provided on the rotating rod (8). A pull rope (14) is wound around the rope winding wheel (12). The free end of the pull rope (14) is passed around the guide and connected to the knocking block (6).

3. The automatic pressure gauge calibration device according to claim 2, characterized in that: The transmission member comprises a first transmission gear (15) arranged on the reciprocating screw rod (4); the rotating rod (8) is provided with a second transmission gear (16) meshing with the first transmission gear (15); the diameter of the second transmission gear (16) is larger than the diameter of the first transmission gear (15).

4. The automatic pressure gauge calibration device according to claim 1, characterized in that: A damping rubber block (17) is provided between the knocking block (6) and the pressurizing platform (1).

5. The automatic pressure gauge calibration device according to claim 1, characterized in that: The pressurizing platform (1) is provided with a limiting member that acts on the striking block (6) and limits or releases the limiting member.

6. The automatic pressure gauge calibration device according to claim 5, characterized in that: The limiting member comprises a limiting groove (18) provided on the knocking block (6); a limiting rod (19) is hingedly connected to the pressurizing platform (1) and a torsion spring (20) is provided between the limiting rod (19) and the limiting groove (18) and is in contact with and overlapped on the knocking block (6).

7. The automatic pressure gauge calibration device according to claim 1, characterized in that: The pressurizing platform (1) is provided with a driving member that acts on the reciprocating screw (4) and drives it to rotate intermittently.

8. The automatic pressure gauge calibration device according to claim 7, characterized in that: The driving member includes a driving motor (21) arranged on the pressurizing platform (1), a driving gear (22) is arranged on the output shaft of the driving motor (21), two rollers (23) are rotatably arranged on the driving gear (22), a fixed gear (24) meshing with the driving gear (22) is arranged on the reciprocating screw (4), a notch (25) and a beaver tail plate (26) corresponding in position are arranged on the fixed gear (24), and the beaver tail plate (26) and the roller (23) are rollingly overlapped.

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