Torque testing device for pneumatic actuating mechanism

Abstract

The utility model relates to the technical field of pneumatic actuating mechanisms, in particular to a torque testing device for a pneumatic actuating mechanism, which comprises a cross-shaped framework, a force arm, a connecting shaft, two digital display tension meters and an adjusting screw. A plurality of groups of positioning pin holes are uniformly formed in the arc surface of the cross-shaped framework, and cylindrical pins are inserted into the positioning pin holes; a connecting shaft is inserted into the middle of the force arm and then is matched and connected with the output end of a gear shaft of the pneumatic actuating mechanism; L-shaped bosses are respectively arranged at two ends of the force arm; the force measuring end of the digital display tension meter is connected with the L-shaped boss through an adjusting screw, and the circular ring end of the digital display tension meter is sleeved on the cylindrical pin. According to the torque testing device for the pneumatic actuating mechanism, the two symmetrical digital display tension meters are adopted for reading, the influence of the sliding friction force of the gear shaft on a torque testing result can be counteracted, and the torque testing device is simple in structure, low in cost, easy to operate and use and accurate in testing result.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, and particularly relates to a torque testing device for a pneumatic actuator. Background Art

[0002] A pneumatic actuator is an actuator that uses compressed air as power to complete the opening, closing or adjustment of a valve, and is generally popularly called a pneumatic head.

[0003] When detecting the torque of the existing pneumatic actuators, manual fixation is mostly used, and then a device equipped with a torque reading is used for testing, so as to detect the torque of the pneumatic actuator. For pneumatic actuators with too large output torque, multiple people are required to cooperate during the detection, and the detection efficiency is low. Moreover, most of the existing torque reading devices are digital display torque wrenches, and the fit between their fixed ends and the actuator is poor, making it inconvenient to operate. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model discloses a torque testing device for a pneumatic actuator.

[0005] The specific technical solutions are as follows:

[0006] A torque testing device for a pneumatic actuator includes a cross-shaped skeleton, a force arm, a connecting shaft, two digital display tension meters and adjusting screws; the cross-shaped skeleton includes a skeleton body A and a skeleton body B that are perpendicularly connected to each other. The two ends of the skeleton body A extend vertically upward and downward respectively to form two centrally symmetric arc surfaces. The center of the circle where the arc surface is located coincides with the axis center of the connecting shaft; multiple groups of positioning pin holes are evenly opened on the arc surface, and cylindrical pins are inserted into the positioning pin holes; a shaft hole is opened in the middle of the force arm. After inserting the connecting shaft, it is cooperatively connected with the output end of the gear shaft of the pneumatic actuator. L-shaped bosses are respectively opened at both ends of the force arm. Through holes are opened on the inner surface of the boss of the L-shaped boss, and the inner surface of the boss coincides with the radial reference plane of the force arm; a threaded hole is opened at the force measuring end of the digital display tension meter. The adjusting screw passes through the through hole on the inner surface of the boss and is screwed into the threaded hole, and the circular ring end is sleeved on the cylindrical pin.

[0007] An installation seat extends from the arc surface towards the center of the circle. The installation seat has a bend and is fixed to the pneumatic actuator, so that the output end of the gear shaft faces the shaft hole of the force arm.

[0008] The opening depth of the threaded hole can meet the entire adjustment stroke of the adjusting screw.

[0009] A positioning key is arranged on the connecting shaft, and the positioning key is in clearance fit with the key groove of the output end of the gear shaft of the pneumatic actuator.

[0010] A limiting slot is circumferentially opened concentrically on the cylindrical pin. The vertex of the inner surface of the limiting slot coincides with the center of the cylindrical pin and is radially clamped and fixed with the circular ring end.

[0011] The number of the positioning pin holes is six, with three in a group, which are symmetrically distributed on the upper and lower arc surfaces respectively, and the included angle between two adjacent positioning pin holes is 15°.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] The torque test device of the pneumatic actuator of the utility model uses two symmetric digital display tension meters for reading, which can offset the influence of the sliding friction force of the gear shaft on the torque test result; since the skeleton is fixed on the pneumatic actuator, the internal force of the whole torque test device is balanced during the torque test process, and there is no need to fix the pneumatic actuator on any platform, reducing the error of the torque measurement result; according to the comparison of the test results at three different test points, the test results can be verified, improving the accuracy of the test results; the torque test device of the pneumatic actuator of the new type has a simple structure, low cost, simple operation and accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a 45° left three-dimensional structural schematic diagram of the test device of the utility model;

[0015] Figure 2 It is a 45° right three-dimensional structural schematic diagram of the test device of the utility model;

[0016] Figure 3 It is the front view of the test device of the utility model;

[0017] In the figure, 1. Cross-shaped skeleton; 11. Skeleton body A; 12. Skeleton body B; 13. Arc surface; 14. Mounting seat; 2. Lever arm; 21. L-shaped boss; 22. Inner surface of the boss; 3. Connecting shaft; 31. Positioning key; 4. Digital display tension meter; 41. Ring end; 42. Force measuring end; 43. Threaded hole; 5. Cylindrical pin; 51. Limit card slot; 6. Adjusting screw; 7. Pneumatic actuator; 71. Gear shaft output end. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes the utility model with reference to the drawings, but the protection scope of the utility model is not limited to the drawings only.

[0019] Figure 1 It is a 45° left three-dimensional structural schematic diagram of the test device of the utility model, Figure 2 It is a 45° right three-dimensional structural schematic diagram of the test device of the utility model, Figure 3 It is the front view of the test device of the utility model, as shown in the figure:

[0020] The torque testing device for the pneumatic actuator of the utility model includes a cross-shaped framework 1, a lever arm 2, a connecting shaft 3, two digital display tension gauges 4 and an adjusting screw 6; the cross-shaped framework 1 includes a framework body A11 and a framework body B12 which are perpendicularly connected to each other. The two ends of the framework body A12 extend vertically upward and downward respectively to form two centrally symmetric arc surfaces 13. The arc surfaces 13 extend towards the center of the circle to form mounting seats 14. The mounting seats 14 are bent and fixed to the pneumatic actuator 7, so that the output end 71 of the gear shaft is opposite to the shaft hole of the lever arm 2. The center of the circle where the arc surface 13 is located coincides with the axis center of the connecting shaft 3; six positioning pin holes are evenly opened on the arc surface 13, three in a group, and are centrally symmetrically distributed on the upper and lower arc surfaces 13 respectively. The included angle between adjacent two positioning pin holes is 15°. The positioning pin holes are inserted with cylindrical pins 5; a shaft hole is opened in the middle of the lever arm 2. After inserting the connecting shaft 3, it is in fit connection with the output end 71 of the gear shaft of the pneumatic actuator 7. A positioning key 31 is arranged on the connecting shaft 3, and the positioning key 31 is in clearance fit with the key groove of the output end 71 of the gear shaft of the pneumatic actuator 7; L-shaped bosses 21 are respectively opened at both ends of the lever arm 2. A through hole is opened on the inner surface 22 of the boss of the L-shaped boss 21, and the inner surface 22 of the boss coincides with the radial reference plane of the lever arm 2; a threaded hole 43 is opened at the force measuring end 41 of the digital display tension gauge 4. The adjusting screw 6 passes through the through hole on the inner surface 22 of the boss and is screwed into the threaded hole 43. The opening depth of the threaded hole 43 can meet the entire adjustment stroke of the adjusting screw 6. The circular ring end 41 is sleeved on the cylindrical pin 5. A limiting card slot 51 is opened on the cylindrical pin 5 in a concentric circumferential manner. The vertex of the inner surface of the limiting card slot 51 coincides with the center of the cylindrical pin 5 and is radially clamped and fixed with the circular ring end 41.

[0021] The testing method of the torque testing device for the pneumatic actuator: First, fix the pneumatic actuator 7 on the mounting seat 14 of the cross-shaped framework 1, so that the output end 71 of the gear shaft is opposite to the shaft hole of the lever arm 2. Then insert one end of the connecting shaft 3 into the shaft hole of the output end 71 of the gear shaft, and the other end into the central shaft hole of the lever arm 2, and perform clearance fit through the positioning key 31 key groove. Then insert the cylindrical pin 5 into the positioning pin hole and perform clamping with the circular ring end 41 of the digital display tension gauge 4. The force measuring end 42 of the digital display tension gauge 4 is connected to the inner surface 22 of the boss of the lever arm 2 through the adjusting screw 6. Turn on the digital display tension gauge 4 and adjust the digital display tension gauge 4 to the critical state of being taut through the adjusting screw 6. Finally, turn on the solenoid valve of the pneumatic actuator 7, and the output torque of the pneumatic actuator under the current air source conditions can be measured. The rotation radius R can be obtained by measuring the distance between the center point of the lever arm and the center of the mounting hole of the adjusting screw. After starting the torque test, add the readings of the two digital display tension gauges to obtain the torsion force F. After recording the readings of the digital display tension gauge on the cylindrical pins at three different positions and calculating the average value, the torque value of the pneumatic actuator under the current air source conditions can be obtained. The testing principle is based on the formula: T = F * R, where T is the torque, R is the rotation radius, and F is the torsion force (the sum of the readings of the two digital display tension gauges).

Claims

1. A pneumatic actuator torque test device, characterized in that: The invention comprises a cross-shaped frame (1), a force arm (2), a connecting shaft (3), two digital display dynamometers (4) and an adjusting screw; the cross-shaped frame (1) comprises a frame body A (11) and a frame body B (12) which are vertically connected to each other, the two ends of the frame body A (11) respectively extend vertically upward and downward to form two centrally symmetrical arc surfaces (13), the center of the circle where the arc surface (13) is located coincides with the axis of the connecting shaft (3); a plurality of groups of positioning pin holes are evenly arranged on the arc surface (13), and cylindrical pins (5) are inserted into the positioning pin holes; The middle of the force arm (2) is provided with an axial hole, into which the connecting shaft (3) is inserted and matched with the output end of the gear shaft of the pneumatic actuator. L-shaped bosses (21) are respectively provided at both ends of the force arm (2). A through hole is provided on the inner surface (22) of the L-shaped boss (21), and the inner surface (22) of the boss coincides with the radial reference surface of the force arm (2). A threaded hole (43) is provided on the force measuring end (42) of the digital display tensile gauge (4). The adjusting screw passes through the through hole on the inner surface (22) of the boss and is screwed into the threaded hole (43). The annular end (41) is sleeved on the cylindrical pin (5).

2. The pneumatic actuator torque testing device according to claim 1, characterized in that: The arc surface (13) extends a mounting seat (14) toward the center of the circle. The mounting seat (14) is bent and fixed to the pneumatic actuator so that the output end of the gear shaft faces the shaft hole of the force arm (2).

3. The pneumatic actuator torque testing device according to claim 1, characterized in that: The threaded hole (43) has a depth that satisfies the entire adjustment stroke of the adjustment screw.

4. The pneumatic actuator torque testing device according to claim 1, characterized in that: A positioning key (31) is arranged on the connecting shaft (3), and the positioning key (31) is clearance-matched with a keyway at the output end of the gear shaft of the pneumatic actuator.

5. The pneumatic actuator torque testing device according to claim 1, characterized in that: A limiting groove (51) is coaxially provided on the cylindrical pin (5), the vertex of the inner surface of the limiting groove (51) coincides with the center of the cylindrical pin (5), and is radially clamped and fixed with the circular ring end (41).

6. The pneumatic actuator torque testing device according to claim 1, characterized in that: The number of the positioning pin holes is six, three in a group, and they are respectively distributed on the upper and lower arc surfaces (13) in a centrally symmetrical manner, and the angle between two adjacent positioning pin holes is 15°.

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