Locking structure of pressure sensor test fixture

Abstract

The utility model relates to the technical field of clamps, in particular to a locking structure of a pressure sensor test clamp. Aiming at the problems that in order to ensure the detection accuracy of a detection module, the central position of a pressure sensor needs to be ensured to be right below the detection module, and at present, a manual mode is adopted for placement and calibration, so that the efficiency is low and the positioning is inaccurate, the following technical scheme is provided: the device comprises a base for placing the pressure sensor; the fixing mechanism is mounted at the top of the base and is used for clamping the pressure sensor before the pressure sensor is measured; the fixing mechanism comprises two groups of clamping plates arranged on two sides of the pressure sensor; and the calibration assembly is arranged on the fixing mechanism and is used for positioning the pressure sensor before the pressure sensor is clamped by the fixing mechanism. According to the utility model, the pressure sensor can be automatically positioned and clamped, the stability of the pressure sensor in the detection process is ensured, the detection accuracy is improved, and meanwhile, the detection efficiency is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a locking structure of a pressure sensor test clamp. Background Art

[0002] Electronic scales often use pressure sensors to measure the weight of an object. These sensors are usually a device called a piezoelectric sensor or a strain gauge sensor, which can convert the pressure exerted on them by an object into an electrical signal. In electronic scales, these sensors are usually placed under the support structure of the scale pan. When an object is placed on the scale pan, its weight causes the sensor to generate strain, which generates an electrical signal, which is processed and displayed on the digital display on the scale pan.

[0003] Before the pressure sensor leaves the factory, it is necessary to test the pressure sensor to ensure that its accuracy during detection is up to standard. The current detection method is to manually place the pressure sensor under the detection module, and the detection module presses down the pressure sensor. The display data of the detection module is compared with the pressure sensor data to know the accuracy of the pressure sensor. At the same time, in order to ensure the accuracy of the detection module, it is necessary to ensure that the center position of the pressure sensor is directly below the detection module. At present, it is placed and calibrated manually, which has the problems of low efficiency and inaccurate positioning. In view of this, the utility model proposes a locking structure of a pressure sensor test fixture. Utility Model Content

[0004] The purpose of the utility model is to address the problem in the background technology that in order to ensure the accuracy of detection by the detection module, it is necessary to ensure that the center position of the pressure sensor is directly below the detection module. Currently, the placement and calibration are performed manually, which has the problems of low efficiency and inaccurate positioning. A locking structure of a pressure sensor test fixture is proposed.

[0005] The technical solution of the utility model: a locking structure of a pressure sensor test fixture, including a base for placing the pressure sensor, and also including a fixing mechanism installed on the top of the base to clamp the pressure sensor before measuring it, the fixing mechanism including two groups of clamping plates arranged on both sides of the pressure sensor; a calibration component arranged on the fixing mechanism to position the pressure sensor before clamping by the fixing mechanism, the calibration component including positioning pins, a push plate, a sliding rod, and a limit ring, each of the two groups of clamping plates is rotatably connected with two groups of positioning pins, the positioning pins are fixedly connected to the push plate penetrated in the clamping plate, the push plate is fixedly connected to the sliding rod at one end away from the pressure sensor, and the two ends of the sliding rod are respectively slidably connected to the two groups of limit rings.

[0006] Optionally, the fixing mechanism also includes a fixing plate, a servo motor, a bidirectional threaded rod, a fixing seat, and a threaded sleeve. The two groups of fixing plates are fixedly connected to the top of the base, a servo motor is installed on one side of one group of fixing plates away from the other group of fixing plates, the output end of the servo motor passes through the fixing plate and is fixedly connected to the bidirectional threaded rod, the bidirectional threaded rod is rotatably connected between the two groups of fixing plates, the middle position of the bidirectional threaded rod is also rotatably connected to the fixing seat, the fixing seat is fixedly connected to the top of the base, the two groups of threaded sleeves are respectively arranged on both sides of the fixing seat and are threadedly connected to the bidirectional threaded rod, and the clamping plate is fixedly connected to the threaded sleeve.

[0007] Optionally, the thread directions of the bidirectional threaded rods on both sides of the fixing seat are opposite.

[0008] Optionally, the fixing mechanism further includes a limiting rod and a limiting sleeve, wherein the limiting rod is fixedly connected between the two sets of fixing plates, and two sets of limiting sleeves are slidably connected to the limiting rod, and the two sets of limiting sleeves are respectively fixedly connected to one end of the two sets of clamping plates away from the threaded sleeve.

[0009] Optionally, the calibration assembly also includes a connecting plate, a moving rod, a limit plate, and a spring. The two groups of connecting plates are fixedly connected to the side of the two groups of limit rings away from the pressure sensor. The moving rod is installed on the side of the connecting plate away from the limit ring. One end of the two groups of moving rods passes through the fixed plate and is fixedly connected to the limit plate. A spring is arranged between the limit plate and the fixed plate and is sleeved on the outer ring of the moving rod.

[0010] Optionally, a rubber pad is provided on one side of the clamping plate and the push plate close to the pressure sensor.

[0011] Optionally, a detection module is also included, which is arranged on the top of the base and measures the accuracy of the pressure sensor.

[0012] Optionally, the detection module includes a mounting frame, a push rod motor, and a test block. The L-shaped mounting frame is installed on the top of the base, the push rod motor is installed on the top of the mounting frame, and the output end of the push rod motor passes through the mounting frame and is fixedly connected to the test block.

[0013] Compared with the prior art, the utility model has the following beneficial technical effects:

[0014] The utility model sets a fixing mechanism, after the servo motor is started, the bidirectional threaded rod is driven to rotate and the two sets of clamps are close to each other. After the clamps are close to the pressure sensor, the pressure sensor is clamped and fixed to ensure its stability during detection.

[0015] Furthermore, by setting the calibration component, when the two groups of clamping plates are close to each other, the push plates are driven to deflect, and the four groups of push plates are deflected synchronously, thereby fixing the pressure sensor at the center position, so that the pressure sensor is accurately positioned just below the test block, which is convenient for detection and ensures the accuracy of detection;

[0016] In summary, the utility model can automatically position and clamp the pressure sensor, ensure its stability during the detection process, improve the accuracy of the detection, and significantly improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a locking structure of a pressure sensor test fixture;

[0018] Figure 2 is a top view schematic diagram of the fixing mechanism;

[0019] Figure 3 is a schematic diagram of the structure of the calibration component.

[0020] Reference numerals:

[0021] 1. Pressure sensor; 2. Base;

[0022] 3. Detection module; 31. Mounting frame; 32. Push rod motor; 33. Test block;

[0023] 4. Fixing mechanism; 41. Fixing plate; 42. Servo motor; 43. Bidirectional threaded rod; 44. Fixing seat; 45. Threaded sleeve; 46. Clamping plate; 47. Limiting rod; 48. Limiting sleeve;

[0024] 5. Calibration assembly; 51. Positioning pin; 52. Push plate; 53. Sliding rod; 54. Limiting ring; 55. Connecting plate; 56. Moving rod; 57. Limiting plate; 58. Spring. DETAILED DESCRIPTION

[0025] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0026] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0027] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example

[0031] like Figure 1As shown, the locking structure of a pressure sensor test fixture proposed by the utility model includes a base 2 for placing a pressure sensor 1, and also includes a fixing mechanism 4 installed on the top of the base 2 to clamp the pressure sensor 1 before measuring it. The fixing mechanism 4 includes two groups of clamping plates 46 arranged on both sides of the pressure sensor 1. The two groups of clamping plates 46 clamp the pressure sensor 1 when they are close to each other, so that the position of the pressure sensor 1 is fixed. The fixing mechanism 4 also includes a fixing plate 41, a servo motor 42, a bidirectional threaded rod 43, a fixing seat 44, and a threaded sleeve 45. The two groups of fixing plates 41 are fixedly connected to the top of the base 2. A servo motor 42 is installed on one side of one group of fixing plates 41 away from the other group of fixing plates 41. The output end of the servo motor 42 passes through the fixing plate 41 and is fixedly connected to the bidirectional threaded rod 43. After starting, the servo motor 42 drives the bidirectional threaded rod 43 to rotate. The bidirectional threaded rod 43 is rotatably connected between the two groups of fixing plates 41, and the bidirectional threaded rod 43 rotates in place. The middle position of the bidirectional threaded rod 43 is also rotatably connected with a fixed seat 44, which is fixedly connected to the top of the base 2 to support the middle position of the bidirectional threaded rod 43 to ensure the stability of rotation. Two groups of threaded sleeves 45 are respectively arranged on both sides of the fixed seat 44 and are threadedly connected with the bidirectional threaded rod 43. When the bidirectional threaded rod 43 rotates, the two groups of threaded sleeves 45 are driven to move along the length direction of the bidirectional threaded rod 43. The thread directions of the bidirectional threaded rod 43 on both sides of the fixed seat 44 are opposite, so that the two groups of threaded sleeves 45 move in opposite directions. The clamping plate 46 is fixedly connected with the threaded sleeve 45. When the threaded sleeve 45 moves, it drives the clamping plate 46 to move synchronously. At the same time, the threaded sleeve 45 is limited by the clamping plate 46 and does not rotate. The fixing mechanism 4 also includes a limiting rod 47 and a limiting sleeve 48. The limiting rod 47 is fixedly connected between the two sets of fixing plates 41. Two sets of limiting sleeves 48 are slidably connected to the limiting rod 47. The two sets of limiting sleeves 48 are respectively fixedly connected to one end of the two sets of clamping plates 46 away from the threaded sleeve 45, so that the clamping plates 46 are stable when moving.

[0032] For further information, see Figure 2 and Figure 3The above-mentioned clamp includes a calibration component 5 which is arranged on the fixing mechanism 4 to position the pressure sensor 1 before the fixing mechanism 4 clamps it. The calibration component 5 includes a positioning pin 51, a push plate 52, a sliding rod 53, and a limiting ring 54. Two groups of positioning pins 51 are rotatably connected in each of the two groups of clamps 46. The positioning pins 51 are fixedly connected to the push plates 52 which are penetrated in the clamps 46. The push plates 52 deflect with the positioning pins 51 as the axis, so that the push plates 52 can approach the pressure sensor 1 when deflecting, and push the pressure sensor 1 to the center position. The end of the push plate 52 away from the pressure sensor 1 is fixedly connected with the sliding rod 53. The two ends of the sliding rod 53 are respectively slidably connected to the two groups of limiting rings 54. When the push plate 52 deflects, the sliding rod 53 slides in the limiting ring 54. The calibration assembly 5 also includes a connecting plate 55, a moving rod 56, a limiting plate 57, and a spring 58. The two groups of connecting plates 55 are fixedly connected to the side of the two groups of limiting rings 54 away from the pressure sensor 1, and the connecting plate 55 moves synchronously with the limiting ring 54. The moving rod 56 is installed on the side of the connecting plate 55 away from the limiting ring 54. One end of the two groups of moving rods 56 passes through the fixed plate 41 and is fixedly connected to the limiting plate 57. The limiting plate 57 is used to limit and prevent the moving rod 56 from detaching, and at the same time supports and compresses the spring 58. A spring 58 is arranged between the limiting plate 57 and the fixed plate 41 and is sleeved and installed on the outer ring of the moving rod 56. The spring 58 is compressed when the limiting plate 57 approaches the fixed plate 41, thereby releasing the elastic force to drive the limiting ring 54 away from the clamping plate 46, so that the push plate 52 is deflected. Rubber pads are arranged on the side of the clamping plate 46 and the push plate 52 close to the pressure sensor 1 to prevent the surface of the pressure sensor 1 from being worn.

[0033] Furthermore, Figure 1 As shown, the fixture also includes a detection module 3 arranged on the top of the base 2 to measure the accuracy of the pressure sensor 1. The detection module 3 includes a mounting frame 31, a push rod motor 32, and a test block 33. The L-shaped mounting frame 31 is installed on the top of the base 2, and the push rod motor 32 is installed on the top of the mounting frame 31. The output end of the push rod motor 32 passes through the mounting frame 31 and is fixedly connected with the test block 33. The test block 33 is used to monitor the pressure between the push rod motor 32 and the pressure sensor 1, which is convenient for comparison with the display data of the pressure sensor 1. After starting, the push rod motor 32 drives the test block 33 to approach the pressure sensor 1, so as to compare the pressure perceived by the test block 33 with the pressure borne by the pressure sensor 1, thereby detecting the pressure sensor 1 and knowing the accuracy of the pressure sensor 1.

[0034] In this embodiment, firstly, the pressure sensor 1 is directly placed between the two groups of clamping plates 46, and the servo motor 42 is started. The servo motor 42 drives the bidirectional threaded rod 43 to rotate in place. At this time, the two groups of threaded sleeves 45 are close to each other, and at the same time, the clamping plates 46 are driven to move closer to each other under the limiting action of the limiting rod 47 and the limiting sleeve 48. At the same time, when the clamping plates 46 move, they drive the positioning pin 51 to move to the middle position, and at the same time, the sliding rod 53, the limiting ring 54, and the connecting plate 55 all start to move. At the same time, the connecting plate 55 drives the limiting plate 57 to move through the moving rod 56. At this time, the limiting plate 57 squeezes the spring 58, and the elastic force of the spring 58 makes the moving distance of the limiting plate 57 smaller than the moving distance of the clamping plate 46, so that the distance between the clamping plate 46 and the sliding rod 53 increases, that is, at this time, the push plate 52 will rotate around the positioning pin 51 as the center. The four groups of push plates 52 deflect synchronously and push the pressure sensor 1 to the center position. At this time, the clamping plate 46 has not yet contacted the pressure sensor 1. When the pressure sensor 1 moves to the center position, the push plate 52 cannot continue to deflect. At this time, the spring 58 is continuously compressed until the clamping plate 46 contacts the pressure sensor 1 to clamp and fix the pressure sensor 1. Finally, the push rod motor 32 is started to drive the test block 33 to approach the pressure sensor 1. By comparing the output pressure of the push rod motor 32 with the display data of the pressure sensor 1, the accuracy of the pressure sensor 1 is tested, which has high working efficiency.

[0035] The above specific embodiment is only an optional embodiment of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above embodiment, those skilled in the art can make various alternative improvements and combinations to the above specific embodiment.

Claims

1. A locking structure for a pressure sensor test fixture, comprising a base (2) for placing a pressure sensor (1), characterized in that: Also includes: A fixing mechanism (4) mounted on the top of the base (2) for clamping the pressure sensor (1) before measuring the pressure sensor (1), the fixing mechanism (4) comprising two groups of clamping plates (46) arranged on both sides of the pressure sensor (1); A calibration component (5) is arranged on the fixing mechanism (4) to position the pressure sensor (1) before the fixing mechanism (4) clamps it. The calibration component (5) includes a positioning pin (51), a push plate (52), a sliding rod (53), and a limiting ring (54). Two groups of positioning pins (51) are rotatably connected in each of the two groups of clamps (46). The positioning pins (51) are fixedly connected to the push plate (52) penetrated in the clamp (46). The end of the push plate (52) away from the pressure sensor (1) is fixedly connected to the sliding rod (53). The two ends of the sliding rod (53) are respectively slidably connected to the two groups of limiting rings (54).

2. The locking structure of a pressure sensor test fixture according to claim 1, characterized in that: The fixing mechanism (4) further comprises a fixing plate (41), a servo motor (42), a bidirectional threaded rod (43), a fixing seat (44), and a threaded sleeve (45); two groups of the fixing plates (41) are fixedly connected to the top of the base (2); a servo motor (42) is installed on one side of the fixing plates (41) away from the other group of fixing plates (41); an output end of the servo motor (42) passes through the fixing plate (41) and is fixedly connected to the bidirectional threaded rod (43); the bidirectional threaded rod (43) is rotatably connected between the two groups of fixing plates (41); a fixing seat (44) is also rotatably connected to the middle position of the bidirectional threaded rod (43); the fixing seat (44) is fixedly connected to the top of the base (2); two groups of the threaded sleeves (45) are respectively arranged on both sides of the fixing seat (44) and are threadedly connected to the bidirectional threaded rod (43); and the clamping plate (46) is fixedly connected to the threaded sleeve (45).

3. The locking structure of a pressure sensor test fixture according to claim 2, characterized in that: The bidirectional threaded rods (43) on both sides of the fixing seat (44) have opposite thread directions.

4. The locking structure of a pressure sensor test fixture according to claim 2, characterized in that: The fixing mechanism (4) further comprises a limiting rod (47) and a limiting sleeve (48); the limiting rod (47) is fixedly connected between the two groups of fixing plates (41); the limiting rod (47) is slidably connected with two groups of limiting sleeves (48); the two groups of limiting sleeves (48) are respectively fixedly connected to one end of the two groups of clamping plates (46) away from the threaded sleeve (45).

5. The locking structure of a pressure sensor test fixture according to claim 2, characterized in that: The calibration assembly (5) further comprises a connecting plate (55), a moving rod (56), a limiting plate (57), and a spring (58). The two groups of connecting plates (55) are fixedly connected to the side of the two groups of limiting rings (54) away from the pressure sensor (1). The moving rod (56) is installed on the side of the connecting plate (55) away from the limiting ring (54). One end of the two groups of moving rods (56) passes through the fixed plate (41) and is fixedly connected to the limiting plate (57). A spring (58) is arranged between the limiting plate (57) and the fixed plate (41) and is sleeved on the outer ring of the moving rod (56).

6. The locking structure of a pressure sensor test fixture according to claim 1, characterized in that: A rubber pad is provided on one side of the clamping plate (46) and the push plate (52) close to the pressure sensor (1).

7. The locking structure of a pressure sensor test fixture according to claim 1, characterized in that: It also includes a detection module (3) arranged on the top of the base (2) for measuring the accuracy of the pressure sensor (1).

8. The locking structure of a pressure sensor test fixture according to claim 7, characterized in that: The detection module (3) comprises a mounting frame (31), a push rod motor (32), and a test block (33); the mounting frame (31) is arranged in an L shape and is mounted on the top of the base (2); the push rod motor (32) is mounted on the top of the mounting frame (31); and the output end of the push rod motor (32) passes through the mounting frame (31) and is fixedly connected to the test block (33).

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