Single support type temperature field switching mechanism

Abstract

The utility model discloses a single support type temperature field switching mechanism, which comprises a tray and a swing arm, the tray is arranged above a box body of a test device in parallel and used for placing a temperature sensor, the swing arm is arranged between the tray and the box body, two ends of the swing arm are respectively and rotatably connected with the tray and the box body, and when the swing arm swings, the temperature sensor is arranged on the tray. The swing arm drives the tray to be switched between the first constant-temperature notch and the second constant-temperature notch in the top face of the box body, and a righting unit used for keeping the tray horizontal is arranged beside the swing arm. The device is simple in structure, and when the centralizing unit is the connecting rod and the tray is switched between the first constant-temperature notch and the second constant-temperature notch on the top surface of the box body of the test device, only the outer end of the connecting rod and the outer end of the swing arm are close to the first constant-temperature notch and the second constant-temperature notch; only the outer end of the connecting rod and the outer end of the swing arm can be affected by water vapor emitted by the first constant-temperature notch and the second constant-temperature notch, and therefore the probability of mechanical faults is low.

Description

Technical Field

[0001] The utility model relates to the field of temperature sensor detection, in particular to a single-support type temperature field switching mechanism. Background Art

[0002] The temperature sensor is a key component of the heat meter. To examine the reliability of the temperature sensor, the national standard GB / T 32224-2020 "Heat Meter" requires a durability test for the temperature sensor, which requires 4,000 cycles of high and low temperature durability tests at high and low temperatures. The test requires that the temperature sensor be placed in the high and low temperature tanks for 30 seconds respectively, and the switching time between the temperature tanks is no more than 4 seconds.

[0003] Currently, thermostatic bath technology is relatively mature and can provide a stable temperature field for temperature sensor testing as specified in GB / T 32224-2020, "Heat Meters." However, achieving stable switching is a critical and fundamental issue, directly impacting the success or failure of durability testing. Manual switching, requiring frequent switching, is no longer efficient in today's modern work environments.

[0004] During testing, the temperature sensor needs to switch back and forth between two thermostatic slots with different temperatures at the top of the high and low temperature tanks. This can be done by moving the temperature sensor or the temperature tank. However, the power source and stability requirements for moving the temperature tank are high, and the corresponding drive mechanism is large, so it is not commonly used. The existing solution for moving the temperature sensor uses two linear slides that are perpendicular to each other (longitudinally and vertically) as a switching mechanism. The linear slide realizes the temperature field switching of the temperature sensor through two motors and matching guide rails. The linear slide includes a slider, a slide rail, a lead screw and a motor. In addition, there are four position switches for detecting the position of the temperature sensor, and the position switches are located above the thermostatic slot. During testing, the vertical slide needs to be close to the thermostatic slot. In this thermostatic tank environment where liquid water is the main component, it is easy to cause corrosion of the guide rails, resulting in jamming, or corrosion of the position switch, resulting in poor contact. Moreover, the more parts used, the more likely problems will occur.

[0005] Patent publication number CN216559435U discloses a portable flow meter temperature sensor durability test device, comprising a bracket and a thermostatic bath located below the bracket; a positioning rail mounted on the bracket, to which a slide is slidably connected; a vertical cylinder mounted on the slide, with a temperature sensor mounted on the rod head of the vertical cylinder; and a horizontal cylinder mounted on the bracket, with its base fixed to the bracket and its rod connected to the slide, which moves the slide left and right along the positioning rail. The device is complex, has numerous components, and requires an air supply, resulting in a high probability of failure.

[0006] Patent publication number CN214843344U discloses a sensor durability testing device, which includes a test box. A chute is provided in the middle of the top of the top frame of the box. A sliding block is slidably connected to the inside of the chute. A drive motor is mounted on the inner wall of the top frame. The end of the drive motor is connected to a threaded rod, which is threadedly connected to a transfer member. A hydraulic cylinder is mounted at the bottom of the transfer member. The transfer member in the top frame can drive the sensor to experience different temperature settings within the test box. Its structure is also complex and requires a hydraulic station, which increases the probability of failure. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a single-support temperature field switching mechanism for solving the problem that a linear slide is used for temperature field switching during the current temperature sensor durability test, which is prone to malfunction.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A single-support temperature field switching mechanism includes a tray for placing a temperature sensor, which is arranged parallel to the top of a box of a test device, and a swing arm arranged between the tray and the box. The two ends of the swing arm are respectively rotatably connected to the tray and the box. When the swing arm swings, it drives the tray to switch between a first constant temperature slot and a second constant temperature slot on the top surface of the box. A straightening unit is provided next to the swing arm to keep the tray level.

[0010] Furthermore, the straightening unit includes a transmission shaft rotatably connected to the swing arm, the transmission shaft is consistent with the length direction of the swing arm, and a third bevel gear and a second bevel gear are fixedly provided at both ends of the transmission shaft, the third bevel gear and the second bevel gear are coaxial with the transmission shaft, the third bevel gear is arranged at an end of the transmission shaft close to the tray, the third bevel gear is meshed with a fourth bevel gear, the second bevel gear is meshed with the first bevel gear, the first bevel gear is fixedly connected to the box, and the fourth bevel gear is fixedly connected to the tray, the axis of the first bevel gear and the axis of the fourth bevel gear are both perpendicular to the plane where the swing arm swings, the third bevel gear and the second bevel gear are both located between the axis of the first bevel gear and the axis of the fourth bevel gear, and the first bevel gear and the fourth bevel gear are respectively arranged on both sides of the axis of the transmission shaft.

[0011] Furthermore, a vertical mounting plate is fixedly provided on the box body, the first bevel gear is fixedly connected to the mounting plate, the center rotation of the first bevel gear is connected to a drive shaft, and the drive shaft is fixedly connected to the swing arm.

[0012] Furthermore, a motor is fixedly connected to the mounting plate, and the motor is transmission-connected to the drive shaft.

[0013] Further, the top surface of the box is provided with a groove near one side, and one end of the swing arm away from the tray is located in the groove; the righting unit is a connecting rod arranged beside the swing arm, the connecting rod is parallel to the swing arm, the connecting rod and the swing arm are located on the same side of the tray, the connecting rod is equal in length to the swing arm, one end of the swing arm is rotationally connected with the tray, the other end of the swing arm is located in the groove and rotationally connected with the box, and the swing arm, the tray, the connecting rod and the box form a parallelogram four-bar linkage.

[0014] Further, the outer wall of the groove is an installation plate, and an electric motor for driving the swing arm to swing is fixedly arranged outside the installation plate.

[0015] Further, the top surface of the tray is provided with a blind hole, and the temperature sensor to be detected is placed in the blind hole; and the bottom of the blind hole is provided with a through hole in communication with the bottom surface of the tray.

[0016] The positive effects of the utility model are as follows:

[0017] The utility model discloses a swing arm and a tray, the temperature sensor to be detected is placed on the tray, and the tray is provided with a righting unit for keeping the tray horizontal. The righting unit can be a connecting rod arranged beside the swing arm, and the inner end of the connecting rod and the inner end of the swing arm are both lower than the top surface of the test device. The utility model has the advantages of simple structure, low probability of failure and the like. When the tray is switched between the first constant-temperature groove and the second constant-temperature groove on the top surface of the box of the test device, only the outer end of the connecting rod and the outer end of the swing arm are close to the first constant-temperature groove and the second constant-temperature groove, so that only the outer end of the connecting rod and the outer end of the swing arm are affected by the water vapor emitted by the first constant-temperature groove and the second constant-temperature groove. The motor and the position switch are both far away from the first constant-temperature groove and the second constant-temperature groove, so that the probability of failure is low. The switching of the temperature sensor between the two temperature grooves is compared with the traditional X-Y axis movement (i.e. the temperature sensor needs to be raised along the vertical direction, then stopped, then moved along the longitudinal direction to above the other constant-temperature groove, then stopped, and then lowered along the vertical direction to the constant-temperature groove, then stopped), and the switching is converted into circular motion, so that the number of start-stop is reduced, the control is easier, and the abrasion of the equipment is reduced. The utility model has simple control principle, and the tray is in circular motion, so that the motion of the tray and the temperature sensor placed on the tray can be accurately controlled by controlling the swing arm to move in a circular arc. In addition, the utility model has less start-stop actions, and the abrasion of the equipment can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view of example 1;

[0019] Figure 2 is a partial side view of example 1;

[0020] Figure 3 is a schematic view of example 2;

[0021] Figure 4 yes Figure 3 Cross-sectional view of the middle AA part;

[0022] In the picture:

[0023] 1. Box body; 2. First constant temperature slot; 3. Groove; 4. Motor; 5. Mounting plate; 6. Tray; 7. Swing arm; 8. Second constant temperature slot; 9. First bevel gear; 10. Second bevel gear; 11. Transmission shaft; 12. Fourth bevel gear; 13. Third bevel gear; 14. Drive shaft; 15. Connecting rod; 16. Support block. DETAILED DESCRIPTION

[0024] For the convenience of description, in the following description, the direction consistent with the line connecting the center of the first constant temperature slot 2 and the center of the second constant temperature slot 8 is called "longitudinal", and the direction perpendicular to the line in the horizontal plane is called "transverse".

[0025] Example 1

[0026] like Figure 1 and Figure 2 As shown, the current constant temperature bath includes a housing 1, with a first constant temperature slot 2 and a second constant temperature slot 8 arranged longitudinally from left to right at the top of the housing 1. A single-support temperature field switching mechanism is arranged between the first constant temperature slot 2 and the second constant temperature slot 8, and includes a tray 6 arranged parallel to the top of the housing 1 for placing a temperature sensor, and a long rod-shaped swing arm 7 arranged between the tray 6 and the housing 1. The top surface of the tray 6 is provided with a blind hole, and the temperature sensor to be tested is placed in the blind hole. The bottom of the blind hole is distributed with through holes connected to the bottom surface of the tray 6.

[0027] The upper and lower ends of the swing arm 7 are rotatably connected to the front side of the tray 6 and the box body 1 respectively. When the swing arm 7 swings, it drives the tray 6 to switch between the first constant temperature slot 2 and the second constant temperature slot 8 on the box body 1. The tray 6 is provided with a straightening unit for keeping the tray 6 level.

[0028] The top surface of the box body 1 is provided with a groove 3 near the front side, and the outer wall of the groove 3 is a mounting plate 5 connected to the bottom of the box body 1. The inner end of the swing arm 7 is located in the groove 3, and the straightening unit is a connecting rod 15 arranged on the right side of the swing arm 7. The connecting rod 15 is parallel to the swing arm 7. The connecting rod 15 and the swing arm 7 have the same shape and equal length. The connecting rod 15 and the swing arm 7 are both located on the front side of the tray 6. The outer end of the swing arm 7 is rotatably connected to the front side of the tray 6, and the inner end of the swing arm 7 is located in the groove 3 and rotatably connected to the box body 1. The parts where the swing arm 7, tray 6, connecting rod 15 and the box body 1 are connected are connected in sequence to form a parallelogram and constitute a four-bar linkage. The top and bottom sides of the parallelogram are both horizontal.

[0029] A motor 4 is fixedly mounted on the outside of the mounting plate 5, and the output shaft of the motor 4 is connected to the inner end of the swing arm 7. When the motor 4 rotates, it drives the swing arm 7 to swing. According to the characteristics of the four-bar linkage, the tray 6 switches between the first constant temperature slot 2 and the second constant temperature slot 8 along an arc trajectory. During this switching, the tray 6 moves horizontally, that is, the tray 6 always remains in a horizontal state, preventing the temperature sensor connection wires on the tray 6 from being entangled on the tray 6.

[0030] The present utility model has a simple structure. When the tray 6 switches between the first thermostatic slot 2 and the second thermostatic slot 8, only the outer end of the connecting rod 15 and the outer end of the swing arm 7 are close to the first thermostatic slot 2 and the second thermostatic slot 8, and will be affected by the water vapor emitted by the first thermostatic slot 2 and the second thermostatic slot 8, so the probability of mechanical failure is low. In addition, it is only necessary to set two position switches on the side wall of the box body 1 in the groove 3 near the inner end of the swing arm 7 to detect the position of the swing arm 7. When the tray 6 reaches the first thermostatic slot 2 and the second thermostatic slot 8, the swing arm 7 triggers the corresponding position switches respectively, thereby achieving the positioning of the tray 6. Since the number of position switches is reduced, the installation position of the motor 4 and the position switch is far away from the first thermostatic slot 2 and the second thermostatic slot 8, and thus will not be affected by the water vapor emitted by the first thermostatic slot 2 and the second thermostatic slot 8, which can greatly reduce the failure probability of the motor 4 and the position switch.

[0031] In addition, since the inner ends of the swing arm 7 and the connecting rod 15 are lower than the first constant temperature slot 2 and the second constant temperature slot 8, there will be no interference between the swing arm 7 and the connecting rod 15 when they swing, so that the tray 6 can smoothly reach the first constant temperature slot 2 and the second constant temperature slot 8.

[0032] Example 2

[0033] like Figure 3 and Figure 4 As shown, the difference between this embodiment and embodiment 1 is that:

[0034] The righting unit no longer uses a connecting rod 15. Two rectangular support blocks 16 are welded to the outside of the swing arm 7 along its length. The righting unit includes a transmission shaft 1 that extends through and rotatably connects to the two support blocks 16. The transmission shaft 11 is aligned with the length of the swing arm 7, with a third bevel gear 13 and a second bevel gear 10 fixedly mounted at each end. Both the third bevel gear 13 and the second bevel gear 10 are coaxial with the transmission shaft 11.

[0035] The third bevel gear 13 is arranged at one end of the transmission shaft 11 close to the tray 6. The third bevel gear 13 is meshed with the fourth bevel gear 12. The second bevel gear 10 is meshed with the first bevel gear 9. The first bevel gear 9 is fixedly connected to the mounting plate 5 outside the housing 1. The fourth bevel gear 12 is fixedly connected to the tray 6. The axes of the first bevel gear 9 and the fourth bevel gear 12 are parallel to each other and perpendicular to the plane in which the swing arm 7 swings. The third bevel gear 13 and the second bevel gear 10 are both located between the axes of the first bevel gear 9 and the fourth bevel gear 12. The first bevel gear 9 and the fourth bevel gear 12 are respectively arranged on both sides of the axis of the transmission shaft 11. The first bevel gear 9, the second bevel gear 10, the third bevel gear 13 and the fourth bevel gear 12 have the same number of teeth.

[0036] A drive shaft 14 is rotatably connected through the center of the first bevel gear 9 . The drive shaft 14 vertically passes through the mounting plate 5 . The inner end of the drive shaft 14 is fixedly connected to the inner end of the swing arm 7 . The motor 4 is connected to the outer end of the drive shaft 14 .

[0037] When the motor 4 drives the swing arm 7 to swing, the second bevel gear 10 rotates along the first bevel gear 9, and drives the third bevel gear 13 to rotate through the transmission shaft 11, and the third bevel gear 13 drives the fourth bevel gear 12 to rotate, which can also ensure that when the swing arm 7 swings, the tray 6 always remains horizontal, preventing the temperature sensor connecting wire on the tray 6 from being entangled on the tray 6.

[0038] Because the first bevel gear 9, second bevel gear 10, third bevel gear 13, fourth bevel gear 12, and transmission shaft 11 are all located outside the swing arm 7, when the tray 6 reaches the first constant temperature slot 2 and the second constant temperature slot 8, only the outer end of the swing arm 7, the outer end of the transmission shaft 11, the third bevel gear 13, and the fourth bevel gear 12 are affected by moisture. To reduce the impact of moisture, a protective shield can be provided outside the swing arm 7 to cover the third bevel gear 13, fourth bevel gear 12, and transmission shaft 11.

[0039] Example 3

[0040] The difference between this embodiment and embodiment 2 is that:

[0041] Since only one swing arm 7 is used to drive the tray 6 to swing, and there are no parts interfering with the swing arm 7, the mounting plate 5 can be set on the top surface of the box body 1, that is, the lower end of the swing arm 7 is higher than the first constant temperature slot 2 and the second constant temperature slot 8, and there is no need to set the groove 3.

[0042] The above-mentioned embodiments are described in a relatively detailed and specific manner, expressing preferred embodiments of the present invention. They are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. However, they are not limited to the present invention alone, and the patent scope of the present invention cannot be limited solely by these embodiments. That is, any equivalent changes or modifications made to the spirit disclosed by the present invention, for researchers or technicians in this field, without departing from the structure of the present invention, local improvements within the system and changes and conversions between subsystems, etc., are still within the patent scope of the present invention.

Claims

1. A single-support temperature field switching mechanism, characterized in that: The invention comprises a tray (6) for placing a temperature sensor and arranged in parallel above a box (1) of a test device, and a swing arm (7) arranged between the tray (6) and the box (1). The two ends of the swing arm (7) are rotatably connected to the tray (6) and the box (1), respectively. When the swing arm (7) swings, it drives the tray (6) to switch between a first constant temperature slot (2) and a second constant temperature slot (8) on the top surface of the box (1). The tray (6) is provided with a straightening unit for keeping the tray (6) horizontal.

2. A single-support temperature field switching mechanism according to claim 1, characterized in that: The straightening unit comprises a transmission shaft (11) rotatably connected to the swing arm (7), the transmission shaft (11) and the swing arm (7) are in the same length direction, a third bevel gear (13) and a second bevel gear (10) are fixedly provided at both ends of the transmission shaft (11), the third bevel gear (13) and the second bevel gear (10) are both coaxial with the transmission shaft (11), the third bevel gear (13) is provided at one end of the transmission shaft (11) close to the tray (6), the third bevel gear (13) is meshed with a fourth bevel gear (12), and the second bevel gear (10) is fixedly provided with a third bevel gear (13) and a second bevel gear (10) ) is meshed with a first bevel gear (9), the first bevel gear (9) is fixedly connected to the box body (1), the fourth bevel gear (12) is fixedly connected to the tray (6), the axis of the first bevel gear (9) and the axis of the fourth bevel gear (12) are both perpendicular to the plane where the swing arm (7) swings, the third bevel gear (13) and the second bevel gear (10) are both located between the axis of the first bevel gear (9) and the axis of the fourth bevel gear (12), and the first bevel gear (9) and the fourth bevel gear (12) are respectively arranged on both sides of the axis of the transmission shaft (11).

3. A single-support temperature field switching mechanism according to claim 2, characterized in that: A vertical mounting plate (5) is fixedly provided on the box body (1); the first bevel gear (9) and the mounting plate (5) are fixedly connected; the center of the first bevel gear (9) is rotatably connected to a drive shaft (14); and the drive shaft (14) is fixedly connected to the swing arm (7).

4. A single-support temperature field switching mechanism according to claim 3, characterized in that: A motor (4) is fixedly connected to the mounting plate (5), and the motor (4) is in transmission connection with a drive shaft (14).

5. The single-support temperature field switching mechanism according to claim 1, characterized in that: The top surface of the box (1) is provided with a groove (3) near one side, and the end of the swing arm (7) away from the tray (6) is located in the groove (3). The straightening unit is a connecting rod (15) arranged beside the swing arm (7). The connecting rod (15) is parallel to the swing arm (7). The connecting rod (15) and the swing arm (7) are located on the same side of the tray (6). The connecting rod (15) and the swing arm (7) are of equal length. One end of the swing arm (7) is rotatably connected to the tray (6), and the other end of the swing arm (7) is located in the groove (3) and rotatably connected to the box (1). The swing arm (7), the tray (6), the connecting rod (15) and the box (1) constitute a parallelogram four-bar linkage.

6. The single-support temperature field switching mechanism according to claim 5, characterized in that: The outer wall of the groove (3) is a mounting plate (5), and a motor (4) for driving the swing arm (7) to swing is fixedly provided on the outside of the mounting plate (5).

7. The single-support temperature field switching mechanism according to claim 1, characterized in that: The top surface of the tray (6) is provided with a blind hole, the temperature sensor to be detected is placed in the blind hole, and the bottom of the blind hole is provided with through holes communicating with the bottom surface of the tray (6).

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