Pneumatic protection device of plastic circuit breaker

Abstract

The invention relates to the technical field of circuit breaker protection, and discloses a pneumatic protection device for a plastic circuit breaker, which comprises a plastic shell, the inner wall of the plastic shell is fixedly connected with a rotary switch, the top of the plastic shell is fixedly connected with a fixed seat, and the inner wall of the plastic shell is fixedly connected with a connector. A first fixing block is fixedly connected to the inner wall of the plastic shell, an air cylinder is fixedly connected to the inner wall of the first fixing block, and a protection mechanism used for ventilation is arranged on the inner wall of the plastic shell. The disconnection of the test line and the connector can prevent equipment damage and avoid fire risk, excessive current can cause heating of electrical equipment and surrounding materials, if the current is not cut off in time, electrical fire may be caused, personnel safety can be guaranteed, electric shock accidents can be avoided, and arc damage can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breaker protection, in particular to a pneumatic protection device for a plastic circuit breaker. Background Art

[0002] Plastic circuit breakers, also known as molded case circuit breakers, are circuit breakers that install contacts, arc extinguishing chambers, trip devices and operating mechanisms in a plastic casing. After long-term use, the internal components of existing circuit breakers may age or become damaged. If they are not replaced in time, their normal operation will be affected.

[0003] The patent with announcement number CN109727826B discloses a miniature circuit breaker, which includes a circuit breaker housing, a button mechanism and an indicating device. The circuit breaker housing includes an indicating hole arranged on one side thereof. The button mechanism is slidably matched with the circuit breaker housing, and the indicating device is driven to cooperate with the button mechanism. When the button mechanism is pressed to close the miniature circuit breaker, the button mechanism drives the indicating device to cover the indicating hole. The miniature circuit breaker of the patent has an indicating device that can indicate the closing state of the circuit breaker when the circuit breaker is closed, thereby improving the safety of electricity use.

[0004] However, during production testing, the above-mentioned device is generally powered on with a voltage higher than the rated voltage, and it is difficult for the device to automatically disconnect the power supply, resulting in damage to the internal components of the circuit breaker and affecting the subsequent use of the circuit breaker. Therefore, a plastic circuit breaker pneumatic protection device is proposed to solve the above-mentioned problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a pneumatic protection device for a plastic circuit breaker in view of the deficiencies in the above-mentioned prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a pneumatic protection device for a plastic circuit breaker, comprising a plastic shell, the inner wall of the plastic shell is fixedly connected with a rotary switch, the top of the plastic shell is fixedly connected with a fixing seat, the inner wall of the plastic shell is fixedly connected with a connector, the inner wall of the plastic shell is fixedly connected with a fixing block 1, the inner wall of the fixing block 1 is fixedly connected with a cylinder, the inner wall of the plastic shell is provided with a protective mechanism for ventilation, the inner wall of the fixing seat is provided with a stabilizing mechanism for fixing the line, the top of the connector is fixedly connected with a test line, the output end of the cylinder is fixedly connected with a moving block, An L-plate is fixedly connected to the front of the moving block, a current sensor is fixedly connected to the left side of the connector, the test line contacts the fixed seat, the moving block is fixedly connected to the surface of the test line, the L-plate contacts the rotary switch, and the test line contacts the plastic shell, which can prevent the electrical equipment from being damaged by excessive current when the current exceeds the rated value of the equipment. Disconnection of the test line and the connector can prevent equipment damage and avoid fire risks. Excessive current can cause heating of the electrical equipment and the surrounding materials. If the current is not cut off in time, an electrical fire may be caused. The safety of personnel can be guaranteed, electric shock accidents can be avoided, and arc damage can be prevented.

[0007] Preferably, the protective mechanism includes a connecting rod and a closing plate, the connecting rod is fixedly connected to the bottom of the L plate, the closing plate is fixedly connected to the bottom of the connecting rod, the protective mechanism includes a fixed block 2, a push rod, a slot block, an elastic telescopic rod 1, a push plate, a fixed block 3, a protective cover, and a rotating column, the fixed block 2 is fixedly connected to the front of the L plate, the push rod is rotatably connected to the inner wall of the fixed block 2, the slot block is fixedly connected to the inner wall of the plastic shell, the rotating column is slidably connected to the inner wall of the slot block, the push rod is rotatably connected to the circumferential surface of the rotating column, the elastic telescopic rod 1 is fixedly connected to the front of the plastic shell, the push plate is fixedly connected to the telescopic end of the elastic telescopic rod 1, the fixed block 3 is fixedly connected to the front of the plastic shell, and the protective cover is rotatably connected On the inner wall of the fixed block three, the push rod is in contact with the slot block, the push plate is in contact with the protective cover, and the closing plate is in contact with the plastic shell, which can reduce the temperature inside the plastic shell. During the test, the current will generate heat. If the heat cannot be dissipated in time, the temperature of the equipment will rise. The high temperature may cause the shell to deform, age, or even be damaged, affecting the appearance and mechanical properties of the circuit breaker. It is ensured that the protective cover of the device cannot be fully opened during the test to avoid direct contact between the operator and the toggle switch. At the same time, when the device is testing, the protective cover can be rotated to isolate the rotary switch to avoid electric shock accidents. Closing the protective cover can prevent the operator from accidentally touching the live part during the test, thereby preventing the occurrence of electric shock accidents and improving the safety of the device when in use.

[0008] Preferably, the stabilizing mechanism comprises a semi-arc fixed block, a connecting block, a movable column, and a push-pull plate, the semi-arc fixed block is fixedly connected to the inner wall of the fixed seat, the connecting block is fixedly connected to the inner wall of the fixed seat, the movable column is slidably connected to the inner wall of the connecting block, and the push-pull plate is fixedly connected to the circumferential surface of the movable column, the stabilizing mechanism also comprises an elastic telescopic rod 2, a pressing plate, an inclined rod, and an inclined slot column, the elastic telescopic rod 2 is fixedly connected to the inner wall of the fixed seat, the pressing plate is fixedly connected to the telescopic end of the elastic telescopic rod 2, the inclined rod is fixedly connected to the bottom of the pressing plate, and the inclined slot column is fixedly connected to the inner wall of the push-pull plate, the semi-arc fixed block contacts the test line, the inclined slot column is slidably connected to the inner wall of the fixed seat, and the inclined slot column contacts the inclined rod, so as to avoid external factors from tossing the test line, resulting in the disconnection of the connection port of the test line and the connector, affecting the normal use of the device, improving the stability of the device, enabling the test line to be further fixed, ensuring the stability of the line connection when the device is tested, and improving the safety of the device.

[0009] The present invention adopts the above technical solution to bring the following beneficial effects: 1. The pneumatic protection device of the plastic circuit breaker can prevent the electrical equipment from being damaged by excessive current when the current exceeds the rated value of the equipment through the coordinated movement between the plastic shell, rotary switch, fixing seat, connector, fixing block, cylinder, test line, moving block, L plate and current sensor. The disconnection of the test line and the connector can prevent damage to the equipment and avoid the risk of fire. Excessive current can cause heating of the electrical equipment and the surrounding materials. If the current is not cut off in time, it may cause an electrical fire. It can ensure the safety of personnel, avoid electric shock accidents and prevent arc damage.

[0010] 2. The pneumatic protection device for plastic circuit breaker can reduce the temperature inside the plastic shell through the coordinated movement among the connecting rod, the closing plate, the second fixing block, the pushing rod, the slot block, the first elastic telescopic rod, the pushing plate, the third fixing block, the protective cover, and the rotating column. During the test, the current will generate heat. If the heat cannot be dissipated in time, the temperature of the equipment will rise. The high temperature may cause the shell to deform, age, or even be damaged, affecting the appearance and mechanical properties of the circuit breaker. It is ensured that the protective cover of the device cannot be fully opened during the test to avoid direct contact between the operator and the toggle switch. At the same time, when the device is testing, the protective cover can be rotated to isolate the rotary switch to avoid electric shock accidents. Closing the protective cover can prevent the operator from accidentally touching the live part during the test, thereby preventing the occurrence of electric shock accidents and improving the safety of the device when in use.

[0011] 3. The pneumatic protection device for plastic circuit breaker prevents external factors from moving the test line, causing the connection port of the test line and the connector to be disconnected, affecting the normal use of the device, by coordinating the movements among the semi-arc fixed block, the connecting block, the movable column, the push-pull plate, the elastic telescopic rod 2, the pressure plate, the inclined rod, and the inclined slot column, thereby improving the stability of the device, further fixing the test line, ensuring the stability of the line connection when the device is tested, and improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A half-section view of the plastic housing structure of the present invention; Figure 3 This is a schematic diagram of the L-plate structure of the present invention; Figure 4 It is a schematic diagram of the structure of the mobile block of the present invention; Figure 5 It is a schematic diagram of the protection mechanism of the present invention; Figure 6 For the present invention Figure 5 A magnified view of the structure at center; Figure 7 This is a schematic diagram of the structure of the semi-arc fixing block of the present invention; Figure 8 It is a schematic diagram of the oblique rod structure of the present invention.

[0013] In the figure: 1. plastic shell; 2. rotary switch; 3. fixing seat; 4. connector; 5. fixing block 1; 6. cylinder; 7. protection mechanism; 8. stabilizing mechanism; 9. test line; 10. moving block; 11. L plate; 12. current sensor; 701. connecting rod; 702. closing plate; 703. fixing block 2; 704. pushing rod; 705. slot block; 706. elastic telescopic rod 1; 707. pushing plate; 708. fixing block 3; 709. protective cover; 710. rotating column; 801. semi-arc fixing block; 802. connecting block; 803. moving column; 804. push-pull plate; 805. elastic telescopic rod 2; 806. pressing plate; 807. oblique rod; 808. oblique slot column. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figure 1-Figure 8An embodiment of the present invention is: a pneumatic protection device for a plastic circuit breaker, comprising a plastic shell 1, a rotary switch 2 is fixedly connected to the inner wall of the plastic shell 1, a fixing seat 3 is fixedly connected to the top of the plastic shell 1, a connector 4 is fixedly connected to the inner wall of the plastic shell 1, a fixing block 5 is fixedly connected to the inner wall of the plastic shell 1, a cylinder 6 is fixedly connected to the inner wall of the fixing block 5, a protective mechanism 7 for ventilation is provided on the inner wall of the plastic shell 1, a stabilizing mechanism 8 for fixing the line is provided on the inner wall of the fixing seat 3, a test line 9 is fixedly connected to the top of the connector 4, a moving block 10 is fixedly connected to the output end of the cylinder 6, an L-plate 11 is fixedly connected to the front of the moving block 10, a current sensor 12 is fixedly connected to the left side of the connector 4, the test line 9 contacts the fixing seat 3, and the moving block 10 is fixedly connected to the surface of the test line 9. When the device is tested, the operator or the manipulator connects the energized line to the device and then increases the current to the device. The device is tested. When the current value reaches the limit, the current sensor 12 at this time will transmit a signal to the control console, and the cylinder 6 will start at this time. The output end of the cylinder 6 will drive the moving block 10 to move. After the moving block 10 moves, the moving block 10 will drive the test line 9 to move. At this time, the test line 9 and the connector 4 are no longer connected to each other, so as to avoid the electrical equipment being damaged by excessive current when the current exceeds the rated value of the equipment. The disconnection of the test line 9 from the connector 4 can prevent equipment damage and avoid fire risks. Excessive current can cause heating of the electrical equipment and the materials around it. If the current is not cut off in time, an electrical fire may be caused. The L plate 11 is in contact with the rotary switch 2, and the test line 9 is in contact with the plastic housing 1. At the same time, during the movement of the moving block 10, the moving block 10 will drive the L plate 11 to move. When moving, the L plate 11 will squeeze and push the switch button of the rotary switch 2 to close, which can ensure the safety of personnel, avoid electric shock accidents, and prevent arc damage.

[0016] The protective mechanism 7 includes a connecting rod 701 and a closing plate 702. The connecting rod 701 is fixedly connected to the bottom of the L plate 11, and the closing plate 702 is fixedly connected to the bottom of the connecting rod 701. When the device is tested, the rise of the L plate 11 will drive the connecting rod 701 to move, and the connecting rod 701 will drive the closing plate 702 to move while moving. The closing plate 702 will open the opening on the surface of the plastic shell 1 during the movement. At this time, the heat inside the plastic shell 1 is in contact with the outside air, which can reduce the temperature inside the plastic shell 1. During the test, the current will generate heat. If the heat cannot be dissipated in time, it will cause the temperature of the equipment to rise. High temperature can The outer shell can be deformed, aged, or even damaged, affecting the appearance and mechanical properties of the circuit breaker. The protective mechanism 7 includes a fixed block 2 703, a push rod 704, a slot block 705, an elastic telescopic rod 1 706, a push plate 707, a fixed block 3 708, a protective cover 709, and a rotating column 710. The fixed block 2 703 is fixedly connected to the front of the L plate 11, the push rod 704 is rotatably connected to the inner wall of the fixed block 2 703, the slot block 705 is fixedly connected to the inner wall of the plastic outer shell 1, the rotating column 710 is slidably connected to the inner wall of the slot block 705, the push rod 704 is rotatably connected to the circumferential surface of the rotating column 710, and the elastic telescopic rod 1 706 is fixedly connected to the inner wall of the plastic outer shell 1. At the front, the push plate 707 is fixedly connected to the telescopic end of the elastic telescopic rod 1 706, the fixed block 3 708 is fixedly connected to the front of the plastic shell 1, the protective cover 709 is rotatably connected to the inner wall of the fixed block 3 708, the push rod 704 is in contact with the slot block 705, the push plate 707 is in contact with the protective cover 709, and the closing plate 702 is in contact with the plastic shell 1. The movement of the closing plate 702 can protect the electronic components inside the device and prevent the device from being damaged by overheating. At the same time, during the rising process of the L plate 11, the L plate 11 will drive the fixed block 2 703 to move, the movement of the fixed block 2 703 will drive the push rod 704 to move, and the push rod 704 will drive the rotating column 710 to move At this time, the rotating column 710 will slide on the inner wall of the groove block 705, and the rotating column 710 will contact the push plate 707 and squeeze and push the push plate 707. After the push plate 707 moves, the push plate 707 will block and prevent the protective cover 709 from rotating and opening to a certain extent, ensuring that the protective cover 709 cannot be fully opened when the device is tested, avoiding direct contact between the operator and the rotary switch 2. At the same time, when the device is testing, the protective cover 709 can be rotated to isolate the rotary switch 2 to avoid electric shock accidents. Closing the protective cover 709 can prevent the operator from accidentally touching the live part during the test, thereby preventing the occurrence of electric shock accidents and improving the safety of the device when in use.

[0017] Working principle: When the device is tested, the operator or manipulator connects the power line to the device, and then tests the device by continuously increasing the current. When the current value reaches the limit, the current sensor 12 will transmit a signal to the console, and the cylinder 6 will start. The output end of the cylinder 6 will drive the moving block 10 to move. After the moving block 10 moves, the moving block 10 will drive the test line 9 to move. At this time, the test line 9 and the connector 4 are no longer connected to each other, so as to avoid the electrical equipment being damaged by excessive current when the current exceeds the rated value of the equipment. The disconnection of the test line 9 from the connector 4 can prevent damage to the equipment and avoid the risk of fire. Excessive current can cause the electrical equipment and the surrounding materials to heat up. If the current is not cut off in time, an electrical fire may be caused. At the same time, during the movement of the moving block 10, the moving block 10 will drive the L plate 11 to move. When moving, the L plate 11 will squeeze and push the switch button of the rotary switch 2 to close, which can ensure the safety of personnel, avoid electric shock accidents, and prevent arc damage.

[0018] When the device is tested, the rise of the L plate 11 will drive the connecting rod 701 to move, and the connecting rod 701 will drive the closing plate 702 to move while moving. The closing plate 702 will open the opening on the surface of the plastic shell 1 during the movement. At this time, the heat inside the plastic shell 1 is in contact with the outside air, which can reduce the temperature inside the plastic shell 1. During the test, the current will generate heat. If the heat cannot be dissipated in time, it will cause the temperature of the equipment to rise. The high temperature may cause the shell to deform, age, or even be damaged, affecting the appearance and mechanical properties of the circuit breaker. The movement of the closing plate 702 can protect the electronic components inside the device and prevent the equipment from being damaged by overheating. At the same time, during the rise of the L plate 11, the L plate 11 will drive the fixed block 2 703 to move. The fixed block 2 703 will move. The movement of 03 will drive the push rod 704 to move, and the push rod 704 will drive the rotating column 710 to move. At this time, the rotating column 710 will slide on the inner wall of the slot block 705, and the rotating column 710 will contact and squeeze the push plate 707 to push the push plate 707. After the push plate 707 moves, the push plate 707 will block and prevent the protective cover 709 from rotating and opening to ensure that the protective cover 709 cannot be fully opened when the device is tested, avoiding direct contact between the operator and the rotary switch 2. At the same time, when the device is testing, the protective cover 709 can be rotated to isolate the rotary switch 2 to avoid electric shock accidents. Closing the protective cover 709 can avoid the operator accidentally touching the live part during the test, thereby preventing the occurrence of electric shock accidents and improving the safety of the device when in use.

[0019] See also Figure 1-Figure 8On the basis of the above embodiment, in another embodiment of the present invention, the stabilizing mechanism 8 includes a semi-arc fixing block 801, a connecting block 802, a moving column 803, and a push-pull plate 804. The semi-arc fixing block 801 is fixedly connected to the inner wall of the fixing seat 3, the connecting block 802 is fixedly connected to the inner wall of the fixing seat 3, the moving column 803 is slidably connected to the inner wall of the connecting block 802, and the push-pull plate 804 is fixedly connected to the circumferential surface of the moving column 803. Before the device is used, the operator connects the test line 9 to the connector 4. At this time, the operator pushes the push-pull plate 804 to move, and the movement of the push-pull plate 804 will drive the moving column 803 to move. At this time, the moving column 803 will push the test line 9 to move through its own arc plate. At this time, the test line 9 will be fixed between the semi-arc fixing block 801 and the moving column 803, so as to avoid external factors from moving the test line 9, resulting in the disconnection of the connection port between the test line 9 and the connector 4, affecting the normal use of the device, and improving the stability of the device. 8 also includes an elastic telescopic rod 805, a pressure plate 806, an inclined rod 807, and an inclined slot column 808. The elastic telescopic rod 805 is fixedly connected to the inner wall of the fixing seat 3, the pressure plate 806 is fixedly connected to the telescopic end of the elastic telescopic rod 805, the inclined rod 807 is fixedly connected to the bottom of the pressure plate 806, the inclined slot column 808 is fixedly connected to the inner wall of the push-pull plate 804, the semi-arc fixed block 801 contacts the test line 9, the inclined slot column 808 is slidably connected to the inner wall of the fixing seat 3, and the inclined slot column 80 8 contacts with the inclined rod 807. When the operator pushes the push-pull plate 804, the push-pull plate 804 will drive the inclined slot column 808 to move, and the inclined slot column 808 will slide on the inner wall of the fixing seat 3. After the inclined slot column 808 moves a certain distance, the inclined rod 807 will enter the groove of the inclined slot column 808 through the inclined surface. At this time, the inclined slot column 808 cannot be pushed or pulled, which can further fix the test line 9, ensure the stability of the line connection when the device is tested, and improve the safety of the device.

[0020] Working principle: before the device is used, the operator connects the test line 9 to the connector 4. At this time, the operator pushes the push-pull plate 804 to move. The movement of the push-pull plate 804 will drive the moving column 803 to move. At this time, the moving column 803 will push the test line 9 to move through its own arc plate. At this time, the test line 9 will be fixed between the semi-arc fixed block 801 and the moving column 803 to avoid external factors from moving the test line 9, resulting in the disconnection of the connection port between the test line 9 and the connector 4, affecting the normal use of the device and improving the stability of the device. When the operator pushes the push-pull plate 804, the push-pull plate 804 will drive the inclined groove column 808 to move, and the inclined groove column 808 will slide on the inner wall of the fixed seat 3. After the inclined groove column 808 moves a certain distance, the inclined rod 807 will enter the groove of the inclined groove column 808 through the inclined surface. At this time, the inclined groove column 808 cannot be pushed or pulled, which can further fix the test line 9, ensure the stability of the line connection when the device is tested, and improve the safety of the device.

[0021] The present invention provides a pneumatic protection device for a plastic circuit breaker. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention. All components not specified in this embodiment can be implemented using existing technologies.

Claims

1. A plastic circuit breaker pneumatic protection device, comprising a plastic housing (1), characterized in that: The inner wall of the plastic housing (1) is fixedly connected to a rotary switch (2), the top of the plastic housing (1) is fixedly connected to a fixing seat (3), the inner wall of the plastic housing (1) is fixedly connected to a connector (4), the inner wall of the plastic housing (1) is fixedly connected to a fixing block 1 (5), the inner wall of the fixing block 1 (5) is fixedly connected to a cylinder (6), the inner wall of the plastic housing (1) is provided with a protective mechanism (7) for ventilation, the inner wall of the fixing seat (3) is provided with a stabilizing mechanism (8) for fixing a line, the top of the connector (4) is fixedly connected to a test line (9), the output end of the cylinder (6) is fixedly connected to a moving block (10), the front of the moving block (10) is fixedly connected to an L-plate (11), and the left side of the connector (4) is fixedly connected to a current sensor (12).

2. A plastic circuit breaker pneumatic protection device according to claim 1, characterized in that: The test line (9) is in contact with the fixing seat (3), the moving block (10) is fixedly connected to the surface of the test line (9), the L plate (11) is in contact with the rotary switch (2), and the test line (9) is in contact with the plastic housing (1).

3. A pneumatic protection device for a plastic circuit breaker according to claim 2, characterized in that: The protection mechanism (7) comprises a connecting rod (701) and a closing plate (702); the connecting rod (701) is fixedly connected to the bottom of the L plate (11); and the closing plate (702) is fixedly connected to the bottom of the connecting rod (701).

4. A pneumatic protection device for a plastic circuit breaker according to claim 3, characterized in that: The protective mechanism (7) comprises a second fixing block (703), a push rod (704), a slot block (705), an elastic telescopic rod (706), a push plate (707), a third fixing block (708), a protective cover (709), and a rotating column (710). The second fixing block (703) is fixedly connected to the front part of the L plate (11), the push rod (704) is rotatably connected to the inner wall of the second fixing block (703), and the slot block (705) is fixedly connected to the inner wall of the plastic shell (1). The rotating column (710) is slidably connected to the inner wall of the slot block (705), the pushing rod (704) is rotatably connected to the circumferential surface of the rotating column (710), the elastic telescopic rod 1 (706) is fixedly connected to the front of the plastic shell (1), the pushing plate (707) is fixedly connected to the telescopic end of the elastic telescopic rod 1 (706), the fixed block 3 (708) is fixedly connected to the front of the plastic shell (1), and the protective cover (709) is rotatably connected to the inner wall of the fixed block 3 (708).

5. A pneumatic protection device for a plastic circuit breaker according to claim 4, characterized in that: The push rod (704) contacts the slot block (705), the push plate (707) contacts the protective cover (709), and the closing plate (702) contacts the plastic housing (1).

6. A plastic circuit breaker pneumatic protection device according to claim 5, characterized in that: The stabilizing mechanism (8) comprises a semi-arc fixing block (801), a connecting block (802), a movable column (803), and a push-pull plate (804); the semi-arc fixing block (801) is fixedly connected to the inner wall of the fixing seat (3); the connecting block (802) is fixedly connected to the inner wall of the fixing seat (3); the movable column (803) is slidably connected to the inner wall of the connecting block (802); and the push-pull plate (804) is fixedly connected to the circumferential surface of the movable column (803).

7. A pneumatic protection device for a plastic circuit breaker according to claim 6, characterized in that: The stabilizing mechanism (8) further comprises a second elastic telescopic rod (805), a pressure plate (806), an inclined rod (807), and an inclined slot column (808); the second elastic telescopic rod (805) is fixedly connected to the inner wall of the fixing seat (3); the pressure plate (806) is fixedly connected to the telescopic end of the second elastic telescopic rod (805); the inclined rod (807) is fixedly connected to the bottom of the pressure plate (806); and the inclined slot column (808) is fixedly connected to the inner wall of the push-pull plate (804).

8. A pneumatic protection device for a plastic circuit breaker according to claim 7, characterized in that: The semi-arc fixing block (801) contacts the test line (9), the inclined slot column (808) is slidably connected to the inner wall of the fixing seat (3), and the inclined slot column (808) contacts the inclined rod (807).

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