Automatic torque switching device and automatic torque switching system for pneumatic wrench

Abstract

The utility model discloses an automatic torque switching device and an automatic torque switching system of a pneumatic wrench, the automatic torque switching device of the pneumatic wrench comprises a positioning mechanism, a gas path travel switch and a connector, the positioning mechanism comprises a first positioning reference, the gas path travel switch comprises a switch body and a trigger which are connected with each other, and the connector is connected with the switch body. The first positioning reference can drive the trigger to move between a connection position and a blocking position; the connector is provided with a first air inlet, a second air inlet and an air outlet, the first air inlet and the second air inlet are both communicated with the air outlet, the first air inlet is communicated with the air outlet end of the switch body, the second air inlet is used for being communicated with a low-pressure air source, and the air inlet end of the switch body is used for being communicated with a high-pressure air source; and the air outlet is communicated with a pneumatic wrench. After the product is positioned by the first positioning reference, the trigger can be positioned at the communication position, the output torque of the pneumatic wrench can be automatically increased, and the phenomenon that an operator uses a wrong pneumatic wrench is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle assembly, in particular to an automatic torque switching device for a pneumatic wrench and an automatic torque switching system. Background Art

[0002] At present, the front bracket M6 bolt tightening position is a common position for multiple models. Since the torque standard of the M6 ​​bolt of the Camry model is different from that of the Wildlander and Venza models (11.5N·m~18.5N·m for the Camry model, 5.5N·m~9.5N·m for the Wildlander and Venza models), this position requires the use of two pneumatic wrenches with different torques (one for the Camry model, and one for the Wildlander and Venza models). When operating, the operator needs to select the corresponding pneumatic wrench according to the model produced. When mistakes are made when selecting tools, using the wrong tool for the job will result in poor bolt torque and affect the quality of the product.

[0003] In view of this, it is necessary to provide a new pneumatic wrench torque automatic switching device and torque automatic switching system to solve or at least alleviate the above technical defects. Utility Model Content

[0004] The main purpose of the utility model is to provide a pneumatic wrench torque automatic switching device and a torque automatic switching system, aiming to solve the technical problem of how to avoid using the wrong pneumatic wrench in bolt tightening operations.

[0005] In order to achieve the above object, the utility model provides a pneumatic wrench torque automatic switching device, the pneumatic wrench torque automatic switching device comprising:

[0006] A positioning mechanism, the positioning mechanism comprising a first positioning reference, the first positioning reference being capable of reciprocating between a first reference position and a first starting position;

[0007] A gas path travel switch, the gas path travel switch comprises a switch body and a trigger connected to each other, the first positioning reference is connected to the trigger, the first positioning reference can drive the trigger to reciprocate between a connecting position and a blocking position so that the air inlet end of the switch body and the air outlet end of the switch body are connected or blocked, the first reference position is set corresponding to the connecting position, and the first starting position is set corresponding to the blocking position;

[0008] A connector, wherein the connector is provided with a first air inlet, a second air inlet and an air outlet, the first air inlet and the second air inlet are both connected to the air outlet, the first air inlet is connected to the air outlet end of the switch body, the second air inlet is used to be connected to a low-pressure air source, the air inlet end of the switch body is used to be connected to a high-pressure air source; the air outlet is used to be connected to a pneumatic wrench.

[0009] In one embodiment, the pneumatic wrench torque automatic switching device also includes a first pipeline, one end of the first pipeline is used to connect to the low-pressure gas source, and the other end of the first pipeline is connected to the second air inlet; the pneumatic wrench torque automatic switching device also includes a one-way valve, which is installed on the first pipeline, and the one-way valve can prevent gas from flowing from the second air inlet to the low-pressure gas source.

[0010] In one embodiment, the pneumatic wrench torque automatic switching device also includes a second pipeline, one end of the second pipeline is connected to the air outlet, and the other end of the second pipeline is used to connect to the pneumatic wrench; the pneumatic wrench torque automatic switching device also includes a pressure gauge, which is installed on the second pipeline.

[0011] In one embodiment, the pneumatic wrench torque automatic switching device further includes a mounting frame and a connecting frame, the first positioning reference is movably mounted on the mounting frame, the switch body is mounted on the connecting frame, and the connecting frame is detachably connected to the mounting frame.

[0012] In one embodiment, the positioning mechanism also includes a second positioning reference, the second positioning reference includes a second reference position and a second starting position, the second positioning reference can move back and forth between the second reference position and the second starting position, and the first positioning reference and the second positioning reference are respectively used to position products of different specifications.

[0013] In one embodiment, the connector comprises a three-way joint, and the three-way joint is provided with the first air inlet, the second air inlet and the air outlet.

[0014] In one embodiment, the first positioning reference includes a driving component and a movable rod, the driving component is in transmission connection with the movable rod, the movable rod includes the first reference position and the first starting position, the driving component can drive the movable rod to reciprocate between the first reference position and the first starting position, the movable rod includes a first end and a second end arranged opposite to each other, the first end is connected to the trigger, the movable rod is located at the first reference position, and the second end is used to position the product.

[0015] In one embodiment, the pneumatic wrench torque automatic switching device further includes a third pipeline, one end of the third pipeline is used to connect to the high-pressure gas source, and the other end of the third pipeline is connected to the air inlet end of the switch body.

[0016] In addition, the utility model also provides an automatic torque switching system, which includes the high-pressure air source, the low-pressure air source, the pneumatic wrench and the above-mentioned automatic torque switching device for the pneumatic wrench.

[0017] In one embodiment, the pressure of the high-pressure gas source is 0.4 MPa to 0.6 MPa, and the pressure of the low-pressure gas source is 0.2 MPa to 0.3 MPa.

[0018] In the above technical scheme of the utility model, the first positioning reference is used to position the first product. The first product needs to install bolts with higher torque. When the first product does not need to be assembled, the first positioning reference is located at the first starting position, and the trigger connected to the first positioning reference is in the blocking position. The first positioning reference located at the first starting position will hinder the trigger from moving from the blocking position to the connecting position. When the trigger is in the blocking position, the air inlet and outlet ends of the switch body are blocked, so the gas output by the high-pressure air source cannot pass through the switch body, and thus cannot enter the pneumatic wrench. The gas output by the low-pressure air source enters the pneumatic wrench through the connector. At this time, the pneumatic wrench is only supplied by the low-pressure air source, so the torque output by the pneumatic wrench is relatively low. At this time, the pneumatic wrench can be used for the assembly of the second product. The second product has a lower torque requirement for the bolts than the first product; when the first product needs to be assembled, the first positioning reference moves from the first starting position to the first reference position for positioning the first product, and the trigger moves from the blocking position to the connecting position, so that the gas output by the high-pressure gas source can enter the pneumatic wrench through the switch body and the connector in sequence. At this time, the pneumatic wrench is supplied by both the high-pressure gas source and the low-pressure gas source, so the torque that the pneumatic wrench can output is increased, so that the first product can be assembled. Since the process of installing the bolts is after the product is positioned, the torque of the pneumatic wrench will automatically increase after the first product is positioned, avoiding the operation of manually replacing the pneumatic wrench, and thus avoiding the phenomenon of operators using the wrong pneumatic wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation mode of the utility model or the technical solution in the prior art, the drawings required for use in the implementation mode or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the utility model. For ordinary technicians in this field, other drawings can be obtained by using the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the automatic torque switching device for a pneumatic wrench according to an embodiment of the utility model when processing a second product;

[0021] Figure 2 It is a structural schematic diagram of the automatic torque switching device for a pneumatic wrench according to one embodiment of the utility model when processing a first product.

[0022] Description of Figure Numbers:

[0023]

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications (such as left and right) in the embodiments of the present invention are only used to explain the position of the user in a certain posture (such as the attached Figure 1 The relative position relationship, movement status, etc. between the various components under the specific posture are shown. If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" can explicitly or implicitly include at least one of the features.

[0028] Furthermore, the technical solutions between the various implementation modes of the present invention can be combined with each other, but this must be based on the fact that ordinary technicians in the field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The utility model provides a pneumatic wrench torque automatic switching device 1. In one embodiment, Figure 1 and Figure 2As shown, the pneumatic wrench torque automatic switching device 1 includes a positioning mechanism 11, an air path travel switch 12 and a connector 13, the positioning mechanism 11 includes a first positioning reference 111, and the first positioning reference 111 can reciprocate between a first reference position 1113 and a first starting position 1114; the air path travel switch 12 includes a switch body 121 and a trigger 122 connected to each other, the first positioning reference 111 is connected to the trigger 122, and the first positioning reference 111 can drive the trigger 122 to reciprocate between a connecting position 1221 and a blocking position 1222 so that the air inlet end of the switch body 121 and the switch are connected. The air outlet end of the switch body 121 is connected or blocked, the first reference position 1113 is set corresponding to the connected position 1221, and the first starting position 1114 is set corresponding to the blocked position 1222; the connector 13 is provided with a first air inlet 131, a second air inlet 132 and an air outlet 133, the first air inlet 131 and the second air inlet 132 are both connected to the air outlet 133, the first air inlet 131 is connected to the air outlet end of the switch body 121, the second air inlet 132 is used to be connected to the low-pressure air source 22, and the air inlet end of the switch body 121 is used to be connected to the high-pressure air source 21; the air outlet 133 is used to be connected to the pneumatic wrench 23.

[0030] The first positioning reference 111 is used to position the first product. The first product needs to be installed with a bolt with a higher torque. When the first product does not need to be assembled, the first positioning reference 111 is located at the first starting position 1114, and the trigger 122 connected to the first positioning reference 111 is at the blocking position 1222. The first positioning reference 111 located at the first starting position 1114 will prevent the trigger 122 from moving from the blocking position 1222 to the connecting position 1221. When the trigger 122 is at the blocking position 1222, the switch The air inlet and outlet of the main body 121 are blocked, so the gas output by the high-pressure air source 21 cannot pass through the switch main body 121, and further cannot enter the pneumatic wrench 23. The gas output by the low-pressure air source 22 enters the pneumatic wrench 23 through the connector 13. At this time, the pneumatic wrench 23 is only supplied by the low-pressure air source 22. Therefore, the torque output by the pneumatic wrench 23 is about 5.5N·m~9.5N·m, which is relatively low. At this time, the pneumatic wrench 23 can be used for the assembly of the second product. The second product has a lower torque requirement for the bolts. When the first product needs to be assembled, the first positioning reference 111 moves from the first starting position 1114 to the first reference position 1113 to position the first product, and at the same time, the trigger 122 moves from the blocking position 1222 to the connecting position 1221, so that the gas output by the high-pressure gas source 21 can enter the pneumatic wrench 23 through the switch body 121 and the connector 13 in sequence. At this time, the pneumatic wrench 23 is supplied with gas by both the high-pressure gas source 21 and the low-pressure gas source 22, so The torque that the pneumatic wrench 23 can output is about 11.5N·m~18.5N·m. The torque increases, so that the first product can be assembled. Since the process of installing the bolts is after the product positioning, the torque of the pneumatic wrench 23 will automatically increase after the first product is positioned, avoiding the operation of manually replacing the pneumatic wrench 23, thereby avoiding the phenomenon of poor bolt torque caused by the operator using the wrong pneumatic wrench 23; wherein, the first product is the Camry model, and the second product is the Wildlander and Venza models. It should be noted that since one pneumatic wrench 23 is shared, compared with the use of two pneumatic wrenches 23 in the prior art, not only the cost is reduced, the cost saved is about 5,000 yuan / year, and the daily tool inspection and maintenance hours are saved, the hours saved are about 25 hours / year, and the time spent on replacing the pneumatic wrench 23 is saved, which improves the work efficiency and peace of mind of the work.It should also be noted that the first positioning reference 111 can be connected to the trigger 122 in the form of a movable connection, thereby driving the trigger 122 to reciprocate between the connecting position 1221 and the blocking position 1222. The air path travel switch 12 can also be equipped with a reset spring, and the two ends of the reset spring are respectively connected to the trigger 122 and the switch body 121. The first positioning reference 111 only needs to abut against the trigger 122, and the first positioning reference 111 moves to the left from the first reference position 1113 to the first starting position 1114, and drives the trigger 122 to move from the connecting position 1221 to the blocking position 1222. At this time, the reset spring is stretched and deformed, and the first positioning reference 111 hinders the trigger 122 from moving from the blocking position 1222 to the moving position. When the first positioning reference 111 moves to the right to the first reference position 1113, the trigger 122 lacks the restriction of the first positioning reference 111, and will move from the blocking position 1222 to the connecting position 1221 under the action of the reset spring; wherein, the air path travel switch 12 can be implemented using the existing technology.

[0031] In one embodiment, the pneumatic wrench torque automatic switching device 1 also includes a first pipeline 15, one end of the first pipeline 15 is used to communicate with the low-pressure gas source 22, and the other end of the first pipeline 15 is connected to the second air inlet 132; the pneumatic wrench torque automatic switching device 1 also includes a one-way valve 14, the one-way valve 14 is installed on the first pipeline 15, and the one-way valve 14 can prevent the gas from flowing from the second air inlet 132 to the low-pressure gas source 22. By installing the one-way valve 14, the gas output by the low-pressure gas source 22 can only flow to the connector 13 through the one-way valve 14, avoiding the reverse flow of the airflow at the end of the connector 13 into the low-pressure gas source 22, thereby effectively preventing the high-pressure gas from flowing back and forth. It should be noted that if there is no one-way valve 14, the high-pressure gas source 21 needs a higher pressure to meet the needs of the high torque output of the pneumatic wrench 23.

[0032] In one embodiment, the pneumatic wrench torque automatic switching device 1 further includes a second pipeline 16, one end of which is connected to the air outlet 133, and the other end of which is used to communicate with the pneumatic wrench 23; the pneumatic wrench torque automatic switching device 1 further includes a pressure gauge 20, which is installed on the second pipeline 16. The pressure gauge 20 is provided to detect the pressure of the gas flowing into the pneumatic wrench 23 in real time, so that the operator can judge the torque that the pneumatic wrench 23 can output at this time through the value on the pressure gauge 20.

[0033] In one embodiment, the pneumatic wrench torque automatic switching device 1 further includes a mounting frame 18 and a connecting frame 19, the first positioning reference 111 is movably mounted on the mounting frame 18, the switch body 121 is mounted on the connecting frame 19, and the connecting frame 19 is detachably connected to the mounting frame 18. The connecting frame 19 is detachably connected to the mounting frame 18, thereby facilitating the maintenance and replacement of the air path travel switch 12. It should be noted that the connecting member is connected to the mounting frame 18 by bolts.

[0034] In one embodiment, the positioning mechanism 11 further includes a second positioning reference 112, the second positioning reference 112 includes a second reference position 1121 and a second starting position 1122, the second positioning reference 112 can reciprocate between the second reference position 1121 and the second starting position 1122, and the first positioning reference 111 and the second positioning reference 112 are respectively used to position products of different specifications. The first positioning reference 111 is used to position the first product, and the second positioning reference 112 is used to position the second product. When the first product needs to be assembled, the first positioning reference 111 moves to the first reference position 1113, and the second positioning reference 112 moves to the second starting position 1122. When the second product needs to be assembled, the first positioning reference 111 moves from the first reference position 1113 to the first starting position 1114, and the second positioning reference 112 moves from the second starting position 1122 to the second reference position 1121, thereby positioning the second product, thereby expanding the types of vehicle models that the positioning mechanism 11 can position.

[0035] According to an embodiment of the utility model, the pneumatic wrench torque automatic switching device 1 also includes a switching button, the first positioning reference 111 and the second positioning reference 112 are both electrically connected to the switching button, the operator can operate the switching button according to the production information, the switching button is used to switch between the first product and the second product, or to switch between more products, when the product produced is changed from the first product to the second product, the operator presses the switching button, the first positioning reference 111 moves from the first reference position 1113 to the first starting position 1114, the second positioning reference 112 moves from the second starting position 1122 to the second reference position 1121, the second positioning reference 112 is used to position the second product, the operator first installs the four components of the product, and then clamps the product. The operator clamps the second product with the pneumatic wrench 23, and then operates the pneumatic wrench 23 to install four M6 bolts on the second product. After the installation is completed, the clamp releases the clamp on the second product, so that the second product can be taken out. Similarly, when the product produced is changed from the second product to the first product, the first positioning reference 111 moves from the first starting position 1114 to the first reference position 1113 to position the first product, and the second positioning reference 112 moves from the second reference position 1121 to the second starting position 1122. The operator first installs the four components of the product, and then clamps the first product with the clamp. The operator then operates the pneumatic wrench 23 to install four M6 bolts on the first product. After the installation is completed, the clamp releases the clamp on the first product, so that the first product can be taken out.

[0036] In one embodiment, the connector 13 includes a three-way connector 13A, and the three-way connector 13A is provided with a first air inlet 131, a second air inlet 132 and an air outlet 133. By providing the three-way connector 13A, it is effectively ensured that the first air inlet 131 and the second air inlet 132 can maintain real-time communication with the air outlet 133.

[0037] In one embodiment, the first positioning reference 111 includes a driving component 1111 and a movable rod 1112, the driving component 1111 is in transmission connection with the movable rod 1112, the movable rod 1112 includes a first reference position 1113 and a first starting position 1114, the driving component 1111 can drive the movable rod 1112 to reciprocate between the first reference position 1113 and the first starting position 1114, the movable rod 1112 includes a first end 1115 and a second end 1116 arranged opposite to each other, the first end 1115 is connected to the trigger 122, the movable rod 1112 is located at the first reference position 1113, and the second end 1116 is used to position the product. The driving assembly 1111 is used to drive the movable rod 1112 to move left and right, so that the movable rod 1112 can reciprocate between the first starting position 1114 and the first reference position 1113. The driving assembly 1111 is installed on the mounting frame 18. The movable rod 1112 moves left and right relative to the mounting frame 18, and can drive the trigger 122 to reciprocate between the connecting position 1221 and the blocking position 1222. The driving assembly 1111 drives the movable rod 1112 to move left, and the first end 1115 pushes the trigger 122 to move from the connecting position 1221 to the blocking position 1222. The driving assembly 1111 drives the movable rod 1112 to move right, and the second end 1116 positions the first product, and the trigger 122 returns from the blocking position 1222 to the connecting position 1221. It should be noted that the second positioning reference 112 has the same structure as the first positioning reference 111, which will not be repeated here.

[0038] According to one embodiment of the utility model, the first positioning reference 111 also includes a reset spring, one end of the reset spring is connected to the trigger 122, and the other end is connected to the switch body 121, and the reset spring is used to drive the trigger 122 to move from the blocking position 1222 to the connecting position 1221, wherein the second end 1116 abuts against the trigger 122.

[0039] According to another embodiment of the utility model, the second end 1116 is provided with a waist-shaped hole, and the first positioning reference 111 further includes a connecting piece, one end of the connecting piece is hinged to the waist-shaped hole through a pin, and the other end of the connecting piece is hinged to the trigger 122 .

[0040] In one embodiment, the pneumatic wrench torque automatic switching device 1 further includes a third pipeline 17, one end of the third pipeline 17 is used to connect to the high-pressure gas source 21, and the other end of the third pipeline 17 is connected to the air inlet end of the switch body 121. By providing the third pipeline 17, the switch body 121 can be arranged at a position farther from the high-pressure gas source 21, which increases the flexibility of the installation of the switch body 121. It should be noted that the first pipeline 15, the second pipeline 16 and the third pipeline 17 are all used Air pipe, three-way connector 13A Tee connector 13A.

[0041] In addition, the utility model also provides a torque automatic switching system 2, which includes a high-pressure gas source 21, a low-pressure gas source 22, a pneumatic wrench 23 and the above-mentioned pneumatic wrench torque automatic switching device 1. Among them, the model of the pneumatic wrench 23 can be UL60D. Since the torque automatic switching system 2 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0042] In one embodiment, the pressure of the high-pressure gas source 21 is 0.4 MPa to 0.6 MPa, and the pressure of the low-pressure gas source 22 is 0.2 MPa to 0.3 MPa.

[0043] The above are only preferred implementations of the utility model, and do not limit the patent scope of the utility model. All equivalent structural changes made based on the concept of the utility model and the contents of the description and drawings of the utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A pneumatic wrench torque automatic switching device, characterized in that: include: A positioning mechanism, the positioning mechanism comprising a first positioning reference, the first positioning reference being capable of reciprocating between a first reference position and a first starting position; A gas path travel switch, the gas path travel switch comprises a switch body and a trigger connected to each other, the first positioning reference is connected to the trigger, the first positioning reference can drive the trigger to reciprocate between a connecting position and a blocking position so that the air inlet end of the switch body and the air outlet end of the switch body are connected or blocked, the first reference position is set corresponding to the connecting position, and the first starting position is set corresponding to the blocking position; A connector, wherein the connector is provided with a first air inlet, a second air inlet and an air outlet, the first air inlet and the second air inlet are both connected to the air outlet, the first air inlet is connected to the air outlet end of the switch body, the second air inlet is used to be connected to a low-pressure air source, the air inlet end of the switch body is used to be connected to a high-pressure air source; the air outlet is used to be connected to a pneumatic wrench.

2. The pneumatic wrench torque automatic switching device according to claim 1, characterized in that: The pneumatic wrench torque automatic switching device also includes a first pipeline, one end of which is used to connect to the low-pressure gas source, and the other end of the first pipeline is connected to the second air inlet; the pneumatic wrench torque automatic switching device also includes a one-way valve, which is installed on the first pipeline, and the one-way valve can prevent gas from flowing from the second air inlet to the low-pressure gas source.

3. The pneumatic wrench torque automatic switching device according to claim 1, characterized in that: The pneumatic wrench torque automatic switching device also includes a second pipeline, one end of which is connected to the air outlet, and the other end of the second pipeline is used to communicate with the pneumatic wrench; the pneumatic wrench torque automatic switching device also includes a pressure gauge, which is installed on the second pipeline.

4. The pneumatic wrench torque automatic switching device according to any one of claims 1 to 3, characterized in that: The pneumatic wrench torque automatic switching device also includes a mounting frame and a connecting frame, the first positioning reference is movably mounted on the mounting frame, the switch body is mounted on the connecting frame, and the connecting frame is detachably connected to the mounting frame.

5. The pneumatic wrench torque automatic switching device according to any one of claims 1 to 3, characterized in that: The positioning mechanism also includes a second positioning reference, which includes a second reference position and a second starting position. The second positioning reference can reciprocate between the second reference position and the second starting position. The first positioning reference and the second positioning reference are respectively used to position products of different specifications.

6. The pneumatic wrench torque automatic switching device according to any one of claims 1 to 3, characterized in that: The connector comprises a three-way joint, and the three-way joint is provided with the first air inlet, the second air inlet and the air outlet.

7. The pneumatic wrench torque automatic switching device according to any one of claims 1 to 3, characterized in that: The first positioning reference includes a driving component and a movable rod, the driving component is in transmission connection with the movable rod, the movable rod includes the first reference position and the first starting position, the driving component can drive the movable rod to reciprocate between the first reference position and the first starting position, the movable rod includes a first end and a second end arranged opposite to each other, the first end is connected to the trigger, the movable rod is located at the first reference position, and the second end is used to position the product.

8. The pneumatic wrench torque automatic switching device according to any one of claims 1 to 3, characterized in that: The pneumatic wrench torque automatic switching device also includes a third pipeline, one end of the third pipeline is used to connect to the high-pressure gas source, and the other end of the third pipeline is connected to the air inlet end of the switch body.

9. A torque automatic switching system, characterized in that: The automatic torque switching system comprises the high-pressure air source, the low-pressure air source, the pneumatic wrench and the automatic torque switching device for a pneumatic wrench as claimed in any one of claims 1 to 8.

10. The torque automatic switching system according to claim 9, characterized in that: The pressure of the high-pressure gas source is 0.4MPa-0.6MPa, and the pressure of the low-pressure gas source is 0.2MPa-0.3MPa.

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