Temperature and humidity sensor

Abstract

The utility model relates to the technical field of temperature sensors, and particularly discloses a temperature and humidity sensor, which comprises a shell main body, a circuit board is arranged in the shell main body, a data line is welded on one side of the circuit board, and chip pins, resistors, capacitors and welding spots of leads on the circuit board are completely covered by silicone rubber blocks, so that the temperature and humidity sensor is formed. The waterproof breathable film is installed at the front section of the shell body, the PCB covered with the silicone rubber block is installed in the shell, the rear end of the shell is sealed through the sealing gasket, then resin is filled, and the LED lamp can be normally used for a long time in the environment with the humidity of 90% or above, so that the innovative scheme effectively prevents high-concentration water vapor from corroding and interfering chips and components, and the service life of the LED lamp is prolonged. The reliability and the service life of the sensor are remarkably improved, the reliability and the stability can be shown no matter in a humid environment such as a refrigerator and a cold storage or in other application scenes with strict requirements on temperature and humidity monitoring, and powerful support is provided for temperature and humidity management of a user.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensor technology, and in particular to a temperature and humidity sensor. Background Technology

[0002] Temperature sensors come in many varieties. They can be classified into contact and non-contact types according to their measurement method, and into resistance temperature detectors (RTDs) and thermocouples according to their material and electronic component characteristics. Thermocouples measure temperature based on the relationship between the thermoelectric potential generated in a closed circuit composed of two different metals and the temperature. Resistance temperature detectors (RTDs) measure temperature by utilizing the characteristic that the resistance of a metal or semiconductor changes with temperature. With the leap in semiconductor technology, innovative products such as semiconductor thermocouple sensors and PN junction temperature sensors have emerged and are currently used in many smart home appliances such as refrigerators, air conditioners, dryers, and washing machines.

[0003] For example, Chinese patent CN213514633U discloses a temperature and humidity sensor for refrigerators, including a probe, a data processing device connected to a wall panel via a connecting line, and a back panel. A fixing mechanism is provided on one side of the back panel, and the fixing mechanism includes a first locking block symmetrically arranged on one side surface of the back panel. A second locking block is provided at the rear end of the data processing device, which engages with the first locking block. A first fixing block and a support block are fixedly installed on one side of the back panel. A pressure plate for limiting the second locking block is provided at the top of the support block. A sleeve is provided on one side of the top of the pressure plate. A clamping bolt for clamping the pressure plate is threaded through the top of the first fixing block, and the clamping bolt is fitted and connected to the sleeve.

[0004] The aforementioned patent addresses the problem of inconvenient fixation between existing temperature and humidity sensor probes and the refrigerator's inner compartment. However, existing temperature and humidity sensors still have some shortcomings that need improvement. Currently, most temperature and humidity sensors on the market use a shell combined with a PCB board structure. This design is prone to failure in extreme environments with humidity exceeding 90%, making the sensor susceptible to moisture and damage, and unable to guarantee continuous and stable performance and working status. In addition, existing temperature and humidity sensors usually rely on mechanical fasteners such as bolts for installation, which not only increases the complexity of installation but also brings difficulties in disassembly during subsequent maintenance, hindering convenient maintenance and management of the equipment. Utility Model Content

[0005] The purpose of this invention is to provide a temperature and humidity sensor to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides a temperature and humidity sensor, including a housing body. A circuit board is disposed inside the housing body, and a data cable is soldered to one side of the circuit board. A silicone rubber block is disposed on one side of both the circuit board and the data cable. An encapsulation plate is connected to one side of the housing body, and a waterproof and breathable membrane is fixedly connected to one side of the encapsulation plate. A sealing gasket is fixedly connected to the side of the housing body away from the waterproof and breathable membrane. One side of the data cable passes through the sealing gasket. A mounting ring is fixedly connected to the housing body between the waterproof and breathable membrane and the sealing gasket. A first fixing mechanism is provided between the mounting ring and the encapsulation plate. A limiting mechanism is provided on one side of the first fixing mechanism. A mounting block is fixedly connected to the side of the housing body away from the mounting ring. A mounting plate is disposed below the mounting block, and a second fixing mechanism is provided between the mounting block and the mounting plate.

[0007] Furthermore, the first fixing mechanism includes an insertion hole, which is opened inside the mounting ring. A rod is inserted into the insertion hole, and a first positioning hole is opened inside the rod. There are four first positioning holes, and a first positioning rod is inserted into the first positioning hole. A first driving assembly is provided on both sides of the mounting ring, and the first positioning rod is movably connected to the first positioning hole through the first driving assembly.

[0008] Furthermore, the first drive assembly includes a first square groove, which is formed inside the mounting ring. A first lead screw is rotatably connected inside the first square groove. A first torsion block is fixedly connected to the top end of the first lead screw. A first positioning rod is threaded onto the first lead screw, and one side of the first positioning rod is slidably connected to the first square groove.

[0009] Furthermore, limit grooves are provided on both sides of the interior of the first square groove, and limit blocks are slidably connected inside the limit grooves. One side of the limit block is fixedly connected to one side of the first positioning rod.

[0010] Furthermore, the limiting mechanism includes a through hole, which is formed inside the first torsion block. A limiting bent rod is inserted into the through hole, and a pull block is fixedly connected to the end of the limiting bent rod. One side of the pull block is embedded and slides within the mounting ring.

[0011] Furthermore, the mounting ring has a sliding groove inside, and a slider is slidably connected inside the sliding groove. The slider is fixedly connected to the bottom end of the pull block. An embedding groove is provided on one side of the sliding groove, and an embedding block is slidably connected inside the embedding groove. The embedding block is fixedly connected to the slider.

[0012] Furthermore, a docking block is fixedly connected to the side of the encapsulation plate near the outer shell body, and a docking groove is provided on the side of the outer shell body near the encapsulation plate, with the docking block being movably connected to the docking groove.

[0013] Furthermore, the second fixing mechanism includes a connecting groove, which is formed on both sides of the bottom end of the mounting block. A connecting block is inserted into the connecting groove and is fixedly connected to the mounting plate. A second positioning hole is formed inside the connecting block, and a second positioning rod is inserted into the second positioning hole. A second driving assembly is provided on both sides of the mounting block, and the second positioning rod is movably connected to the second positioning hole through the second driving assembly.

[0014] Furthermore, the second drive assembly includes a second torsion block, which is rotatably connected to one side of the mounting block. A first bevel gear is fixedly connected to one side of the second torsion block extending into the mounting block. A second bevel gear is meshed with one side of the first bevel gear. A second lead screw is fixedly connected to one side of the second bevel gear. A second square groove is provided inside the mounting block. The second lead screw is rotatably connected inside the second square groove. One side of the second positioning rod is slidably connected to the second square groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] Firstly, in this invention, by covering all the chip pins, resistors, capacitors, and solder joints of the leads on the circuit board with silicone rubber blocks, and installing a waterproof and breathable membrane at the front of the main body of the casing, the PCB board covered with silicone rubber blocks is installed inside the casing, the rear end of the casing is sealed with a gasket, and then resin is poured in. This allows for long-term normal use in environments with humidity levels above 90%. This innovative solution not only effectively prevents high concentrations of moisture from corroding and interfering with the chips and components, but also significantly improves the reliability and lifespan of the sensor. Whether in humid environments such as refrigerators and cold storage, or in other application scenarios with strict requirements for temperature and humidity monitoring, it can demonstrate reliable stability and provide strong support for users' temperature and humidity management.

[0017] Secondly, in this utility model, by installing the waterproof and breathable membrane on the encapsulation plate, and fixing the encapsulation plate to the outer shell body through the first fixing mechanism, the waterproof and breathable membrane is reliably and stably installed on the temperature and humidity sensor, preventing the waterproof and breathable membrane from falling off the temperature and humidity sensor. This design also facilitates the subsequent replacement of the waterproof and breathable membrane. Through the setting of the limiting mechanism, the first toggle block in the first fixing mechanism can be effectively prevented from loosening. Long-term operation can also ensure that the first toggle block maintains its initial tightness, thereby further consolidating the overall stability of the waterproof and breathable membrane and the sensor, and effectively avoiding the risk of the waterproof and breathable membrane falling off due to vibration or external force.

[0018] Thirdly, in this utility model, by setting an installation block, a second fixing mechanism, and an installation plate, the installation block is fixed on the temperature and humidity sensor, and the installation plate is pre-fixed on the installation object. Then, the two are connected by the second fixing mechanism, without the need for bolt fixing. By adopting a design that is easier to install and disassemble, the deployment and maintenance of the temperature and humidity sensor can be made faster and simpler, reducing the complexity of operation. This not only improves work efficiency, but also reduces the risk of equipment damage due to improper operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the mounting block in this utility model;

[0021] Figure 3 In this utility model Figure 2 A magnified structural diagram at point A;

[0022] Figure 4 This is a schematic diagram of the packaging board structure in this utility model;

[0023] Figure 5 This is a schematic diagram of one side of the outer shell body of this utility model;

[0024] Figure 6 In this utility model Figure 5 A magnified structural diagram at point B;

[0025] Figure 7 This is a schematic cross-sectional view of one side of the main body of the outer shell in this utility model;

[0026] Figure 8 In this utility model Figure 7 A magnified structural diagram at point C.

[0027] In the diagram: 1. Outer shell; 2. Circuit board; 3. Data cable; 4. Silicone rubber block; 5. Waterproof and breathable membrane; 6. Encapsulation board; 7. First fixing mechanism; 71. Insert rod; 72. Insertion hole; 73. First positioning hole; 74. First positioning rod; 75. First drive assembly; 751. First lead screw; 752. First torsion block; 753. First square groove; 754. Limiting groove; 755. Limiting block; 8. Connecting block; 9. Connecting groove; 10. Mounting ring; 11. Limiting mechanism; 111. Pulling block; 112. 113. Limiting bend; 114. Through hole; 115. Slider; 116. Slide groove; 117. Embedding block; 118. Embedding groove; 12. Sealing gasket; 13. Mounting block; 14. Mounting plate; 15. Second fixing mechanism; 151. Connecting groove; 152. Connecting block; 153. Second positioning hole; 154. Second positioning rod; 155. Second drive assembly; 1551. Second torsion block; 1552. First bevel gear; 1553. Second bevel gear; 1554. Second lead screw; 1555. Second square groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-8In this embodiment of the present invention, a temperature and humidity sensor includes a housing body 1. A circuit board 2 is disposed inside the housing body 1. A data cable 3 is soldered to one side of the circuit board 2. Silicone rubber blocks 4 are disposed on one side of both the circuit board 2 and the data cable 3. An encapsulation plate 6 is connected to one side of the housing body 1. A waterproof and breathable membrane 5 is fixedly connected to one side of the encapsulation plate 6. The waterproof and breathable membrane 5 is typically made of microporous materials such as polytetrafluoroethylene (PTFE) or high-molecular-weight polyethylene. These materials have a special microporous structure, allowing gas molecules smaller than their pore size, such as air, to pass through, while preventing substances larger than their pore size, such as water droplets and dust, from penetrating. A sealing gasket 12 is fixedly connected to the side of the housing body 1 away from the waterproof and breathable membrane 5. One side of the data cable 3 passes through the sealing gasket 12. An installation ring 10 is fixedly connected to the housing body 1 between the waterproof and breathable membrane 5 and the sealing gasket 12. A first fixing mechanism 7 is provided between the installation ring 10 and the encapsulation plate 6. A limiting mechanism 11 is provided on one side of the housing body 1. A mounting block 13 is fixedly connected to the side of the housing body 1 away from the mounting ring 10. A mounting plate 14 is provided below the mounting block 13. The mounting plate 14 is connected and fixed to the mounting object by bolts. A second fixing mechanism 15 is provided between the mounting block 13 and the mounting plate 14. By improving the structure of the temperature and humidity sensor, its stability in extreme environments with humidity exceeding 90% can be ensured, so that the sensor can still work normally under these conditions and is not affected by humidity. This is crucial for occasions that require high-precision temperature and humidity monitoring. By adopting a design that is easier to install and disassemble, the deployment and maintenance of the sensor can be made faster and simpler, reducing the complexity of operation. This not only improves work efficiency but also reduces the risk of equipment damage caused by improper operation. In addition to this circuit scheme, the sealing gasket 12 at the rear end can be eliminated. The potting uses a resin with extremely low flowability, which can achieve long-term normal use in environments with humidity above 90% while reducing costs.

[0030] Please see Figure 1 , 4 , Figure 8The first fixing mechanism 7 includes an insertion hole 72, which is located inside the mounting ring 10. An insertion rod 71 is inserted into the insertion hole 72. Four first positioning holes 73 are provided inside each insertion rod 71. First positioning rods 74 are inserted into each of the first positioning holes 73. First driving assemblies 75 are provided on both sides of the mounting ring 10. The first positioning rods 74 are movably connected to the first positioning holes 73 via the first driving assemblies 75. The first driving assembly 75 includes a first square groove 753. A first screw 751 is rotatably connected inside the first square groove 753. A first torsion block 752 is fixedly connected to the top of the first screw 751. A first positioning rod 74 is threaded onto the first screw 751. One side of the first positioning rod 74 is slidably connected to the first square groove 753. Limiting grooves 754 are formed on both sides of the inside of the first square groove 753. Limiting blocks 755 are slidably connected inside the limiting grooves 754. One side of the limiting block 755 is fixedly connected to one side of the first positioning rod 74. By setting the first fixing mechanism 7, the first driving component 75 drives the first positioning rod 74 to move, causing the first positioning rod 74 to move and insert into the first positioning hole 73. At this time, the insertion rod 71 is fixed with the insertion hole 72. Through the cooperation of the four insertion rods 71 ​​with the insertion hole 72, the encapsulation plate 6 with waterproof and breathable membrane 5 can be effectively prevented from falling off the outer shell body 1, avoiding affecting the sealing performance of the entire device. Moreover, when it is necessary to remove the encapsulation plate 6, the first driving component 75 is used to move the first positioning rod 74 away from the first positioning hole 73. At this time, the insertion rod 71 is no longer fixed with the insertion hole 72, thus completing the process. The disassembly and assembly work is simple and convenient, improving disassembly and assembly efficiency. By setting the first drive component 75, the first torsion block 752 is rotated, which provides power for the rotation of the first lead screw 751, causing the first lead screw 751 to rotate in the first square groove 753, thereby providing power for the first positioning rod 74 to move at the first positioning hole 73, achieving the purpose of disassembly and fixing. By setting the limiting groove 754 and the limiting block 755, the movement position of the first positioning rod 74 can be limited, and the movement of the first positioning rod 74 can be made more stable, thus facilitating the disassembly and assembly work of the encapsulation plate 6.

[0031] Please see Figure 5-6The limiting mechanism 11 includes a through hole 113, which is formed inside the first torsion block 752. A limiting bent rod 112 is inserted into the through hole 113. A pull block 111 is fixedly connected to the end of the limiting bent rod 112. One side of the pull block 111 is embedded and slidably inserted into the mounting ring 10. A sliding groove 115 is formed inside the mounting ring 10. A slider 114 is slidably connected inside the sliding groove 115. The slider 114 is fixedly connected to the bottom end of the pull block 111. An embedding groove 117 is formed on one side of the sliding groove 115. An embedding block 116 is slidably connected inside the embedding groove 117. The embedding block 116 is fixedly connected to the slider 114. By setting the limiting mechanism 11, when the first torsion block 752 is inserted into the first torsion block 752, the limiting mechanism 11 can be adjusted to allow the first torsion block 752 to move. After the positioning rod 74 is connected and fixed to the first positioning hole 73, the pull block 111 is pushed. The pull block 111 drives the limiting bent rod 112 to move, so that the limiting bent rod 112 is inserted into the through hole 113 of the first torsion block 752, so that the first torsion block 752 cannot rotate, thereby ensuring that the first positioning rod 74 is stably connected to the first positioning hole 73, preventing the encapsulation plate 6 from falling off, and providing a guarantee for the installation of the waterproof and breathable membrane 5. By setting the sliding groove 115 and the slider 114, the pull block 111 can slide on the mounting ring 10. The embedded block 116 and the embedded groove 117 are set to prevent the slider 114 from sliding out of the sliding groove 115, so that the limiting bent rod 112 cannot fall off the mounting ring 10. The integrated design avoids the loss of the limiting bent rod 112.

[0032] Please see Figure 5-6 The encapsulation plate 6 is fixedly connected to a docking block 8 on the side near the outer shell body 1. The outer shell body 1 is provided with a docking groove 9 on the side near the encapsulation plate 6. The docking block 8 is movably connected to the docking groove 9. By setting the docking block 8 and the docking groove 9, the encapsulation plate 6 is tightly and reliably connected to the outer shell body 1, thereby improving the structural stability of the connection.

[0033] Please see Figure 1-3The second fixing mechanism 15 includes a connecting groove 151, which is formed on both sides of the bottom end of the mounting block 13. A connecting block 152 is inserted into the connecting groove 151 and is fixedly connected to the mounting plate 14. A second positioning hole 153 is formed inside the connecting block 152, and a second positioning rod 154 is inserted into the second positioning hole 153. A second driving assembly 155 is provided on both sides of the mounting block 13. The second positioning rod 154 is connected to the second positioning rod 154 through the second driving assembly 155. The second drive assembly 155 includes a second torsion block 1551, which is rotatably connected to one side of the mounting block 13. A first bevel gear 1552 is fixedly connected to one side of the mounting block 13, and a second bevel gear 1553 is meshed with one side of the first bevel gear 1552. A second lead screw 1554 is fixedly connected to one side of the second bevel gear 1553. A second square groove 1555 is formed inside the mounting block 13, and the second lead screw 1554 rotates... The second positioning rod 154 is slidably connected to the second square groove 1555 on one side. By setting the second fixing mechanism 15, the connecting block 152 is inserted into the connecting groove 151, connecting the mounting block 13 to the mounting plate 14. Then, the second driving assembly 155 drives the second positioning rod 154 to move, inserting it into the second positioning hole 153, fixing the connecting block 152 to the connecting groove 151. This connects and fixes the mounting block 13 to the mounting plate 14, thus achieving temperature and humidity control. During sensor installation, this design eliminates the need to remove the mounting plate 14 from the mounting object when disassembling the temperature and humidity sensor. By setting the second drive assembly 155, rotating the second torsion block 1551 drives the first bevel gear 1552 to rotate, which in turn drives the second bevel gear 1553 to rotate. The second bevel gear 1553 then drives the second lead screw 1554 to rotate within the second square groove 1555, thereby providing power for the second positioning rod 154 to move at the second positioning hole 153, achieving the purpose of disassembly and fixation.

[0034] The working principle of this utility model is as follows: By covering the chip pins, resistors, capacitors, and solder joints of the leads on the circuit board 2 with silicone rubber blocks 4, and installing a waterproof and breathable membrane 5 at the front of the outer shell 1, the PCB board covered with silicone rubber blocks 4 is installed inside the shell. The rear end of the shell is sealed with a sealing gasket 12, and then resin is poured in. This allows for long-term normal use in environments with humidity levels above 90%. This innovative solution not only effectively prevents corrosion and interference from high concentrations of moisture on the chips and components, but also significantly improves the reliability and lifespan of the sensor. It demonstrates reliable stability in humid environments such as refrigerators and cold storage, as well as in other application scenarios with strict requirements for temperature and humidity monitoring. The encapsulation board 6 is aligned with the outer shell 1, and the mating block 8 is inserted into the mating groove 9 to complete the mating. The first torsion block 752 is rotated, providing power for the rotation of the first lead screw 751, causing the first lead screw 751 to rotate within the first square groove 753, thus moving the first positioning rod 74 into the first positioning hole 73. At this time, the insertion rod 71 is fixed to the insertion hole 72. The cooperation of the four insertion rods 71 ​​and insertion holes 72 can effectively prevent the encapsulation plate 6 with waterproof and breathable membrane 5 from falling off the outer shell body 1. After the first positioning rod 74 is connected and fixed to the first positioning hole 73, the pull block 111 is pushed. The pull block 111 drives the limiting bent rod 112 to move, so that the limiting bent rod 112 is inserted into the through hole 113 of the first torsion block 752, so that the first torsion block 752 cannot rotate, thereby ensuring that the first positioning rod 74 and the first positioning hole 73 are stably connected. To prevent the encapsulation plate 6 from falling off and to ensure the installation of the waterproof and breathable membrane 5, when installing the temperature and humidity sensor, the connecting block 152 is inserted into the connecting groove 151, so that the mounting block 13 is connected to the mounting plate 14. Then, the second driving assembly 155 drives the second positioning rod 154 to move, so that the second positioning rod 154 is inserted into the second positioning hole 153, so that the connecting block 152 is fixed to the connecting groove 151, thereby connecting and fixing the mounting block 13 to the mounting plate 14, thus realizing the installation of the temperature and humidity sensor.

Claims

1. A temperature and humidity sensor comprising a housing body, characterized by, The inside of the shell body is provided with a circuit board, one side of the circuit board is welded with a data line, one side of the circuit board and the data line is provided with a silica rubber block, one side of the shell body is connected with a packaging plate, one side of the packaging plate is fixedly connected with a waterproof and breathable film, one side of the shell body away from the waterproof and breathable film is fixedly connected with a sealing gasket, one side of the data line passes through the sealing gasket, the shell body is fixedly connected with a mounting ring between the waterproof and breathable film and the sealing gasket, the first fixing mechanism is arranged between the mounting ring and the packaging plate, one side of the first fixing mechanism is provided with a limiting mechanism, one side of the shell body away from the mounting ring is fixedly connected with a mounting block, the lower side of the mounting block is provided with a mounting plate, and the second fixing mechanism is arranged between the mounting block and the mounting plate.

2. The temperature and humidity sensor according to claim 1, wherein The first fixing mechanism comprises a jack, the jack is arranged in the inside of the mounting ring, the inside of the jack is inserted with a plug rod, the inside of the plug rod is provided with four first positioning holes, the inside of the first positioning hole is inserted with a first positioning rod, and the two sides of the mounting ring are provided with a first driving assembly.

3. The temperature and humidity sensor according to claim 2, wherein The first driving assembly comprises a first square groove, the first square groove is arranged in the inside of the mounting ring, the inside of the first square groove is rotatably connected with a first screw rod, the top end of the first screw rod is fixedly connected with a first torsion block, the first positioning rod is screwedly connected on the first screw rod, and one side of the first positioning rod is slidably connected with the first square groove.

4. The temperature and humidity sensor according to claim 3, wherein The two sides of the inside of the first square groove are provided with limiting grooves, the inside of the limiting groove is slidably connected with a limiting block, and one side of the limiting block is fixedly connected with one side of the first positioning rod.

5. The temperature and humidity sensor according to claim 3, wherein The limiting mechanism comprises a through hole, the through hole is arranged in the inside of the first torsion block, the inside of the through hole is inserted with a limiting bent rod, the end of the limiting bent rod is fixedly connected with a pulling block, and one side of the pulling block is embedded in the mounting ring in sliding mode.

6. The temperature and humidity sensor according to claim 5, wherein The inside of the mounting ring is provided with a sliding groove, the inside of the sliding groove is slidably connected with a sliding block, the bottom end of the sliding block is fixedly connected with the pulling block, one side of the inside of the sliding groove is provided with an embedding groove, the inside of the embedding groove is slidably connected with an embedding block, and the embedding block is fixedly connected with the sliding block.

7. The temperature and humidity sensor according to claim 1, wherein The side of the packaging plate close to the shell body is fixedly connected with a butt joint block, the side of the shell body close to the packaging plate is provided with a butt joint groove, and the butt joint block and the butt joint groove are movably connected.

8. The temperature and humidity sensor according to claim 1, wherein The second fixing mechanism comprises a connecting groove, the connecting groove is arranged at the two sides of the bottom end of the mounting block, the inside of the connecting groove is inserted with a connecting block, the connecting block is fixedly connected on the mounting plate, the inside of the connecting block is provided with a second positioning hole, the inside of the second positioning hole is inserted with a second positioning rod, the two sides of the mounting block are provided with a second driving assembly, and the second positioning rod is movably connected with the second positioning hole through the second driving assembly.

9. The temperature and humidity sensor according to claim 8, wherein The second driving assembly comprises a second torsion block, the second torsion block is rotationally connected on one side of a mounting block, a first bevel gear is fixedly connected to one side of the second torsion block extending into the mounting block, a second bevel gear is meshingly connected to one side of the first bevel gear, a second lead screw is fixedly connected to one side of the second bevel gear, a second square groove is formed in the interior of the mounting block, the second lead screw is rotationally connected in the interior of the second square groove, and one side of the second positioning rod is slidingly connected with the second square groove.

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