A monostable switch, a double-adjusting switch device, a double-adjusting pressure automatic switch and a control method

Abstract

The present invention discloses a monostable switch, a double-adjusting switch device, a double-adjusting pressure automatic switch and a control method. Compared with the prior art, the present invention has the advantages of fundamentally solving the problems of the pressure differential (the difference between the starting value and the stopping value) being unadjustable and the starting value, the stopping value and the pressure differential being inconsistent during the production and use of various types of existing pressure switches. The starting value, the stopping value and the pressure differential can be adjusted independently, and the structure is simpler and more practical than the existing double-adjusting switch, and the cost performance is higher. After the use of the switch of the present invention, the product scrapping can be greatly reduced and major accidents of burning motors can be avoided, laying a solid foundation for product upgrading; the environmental adaptability of existing products is greatly enhanced, and the technical performance, control accuracy, use performance, service life and economic benefits of existing products are significantly improved.

Description

Technical Field

[0001] The present invention relates to the field of automatic control, and in particular to a monostable switch, a double-adjusting switch device, a double-adjusting pressure automatic switch and a control method. Background Art

[0002] All kinds of existing pressure switches have a common shortcoming during production and use, that is, when setting the pressure start value, stop value and pressure difference (the difference between the start value and the stop value), due to the limitations of its structure, the pressure difference is basically an unadjustable fixed value, so the start value, stop value and pressure difference are inconsistent and cannot be adjusted independently. This will cause a common fatal defect in existing products. When the pressure difference changes during manufacturing and use, it will cause a large number of products to be scrapped, and even cause major accidents such as burning motors. The existing various types of double-adjustment pressure automatic switches rely too much on materials and processes, resulting in increased manufacturing costs and reduced cost performance of the products. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a simple and practical monostable switch, a double-adjustment switch device, a double-adjustment pressure automatic switch and a control method which can independently adjust the starting value, the stopping value and the pressure difference.

[0004] One of the technical solutions adopted by the present invention to solve the above technical problems is: a monostable switch, comprising a switch body and a switch device, wherein the switch body is provided with the switch device, wherein the switch device comprises a reset spring, a shift fork, a static contact, a moving contact, and a lower fulcrum, wherein the static contact is provided at the upper part of the switch body, and the lower fulcrum is provided at a corresponding position at the lower part of the switch body; a guide structure is provided on the switch body so that the shift fork can move linearly up and down in the switch body; a moving contact is provided on the shift fork for closing and opening the switch device; a reset spring is also provided on the upper part thereof for ensuring that the switch device is always in a closed monostable state in the absence of any external force interference.

[0005] The second technical solution adopted by the present invention to solve the above technical problems is: a double-adjustment switch device, including a double-adjustment device, a support spring and a monostable switch, the double-adjustment device including a bracket, a stop bolt, a start bolt and a start spring; a stop bolt is screwed in the top of the bracket, the stop bolt is a hollow bolt, the start bolt is screwed to the stop bolt, and can be rotated up and down in the hollow of the stop bolt for adjustment; the start spring is arranged between the start bolt and the fork, the upper part of which is against the start bolt, and the lower part is against the fork; a guide rail structure is arranged on the bracket, the switch body is arranged in the middle of the bracket, and the lower part is against the The support spring is offset against each other and can move freely up and down between the stop bolt and the support spring along the guide rail structure on the bracket; a bracket chassis is arranged at the bottom of the bracket, and the bracket chassis is rigidly connected to the bracket, and the two ends of the support spring are supported between the switch body and the bracket chassis respectively; a control method for a double-adjustment switch device: (1) the elastic force of the reset spring is set to be greater than the flipping force of the moving contact; (2) the length of the upper rod of the shift fork is appropriately set so that when the moving contact has not yet crossed the lower fulcrum balance point, the lower part of the start spring is offset against the monostable switch; (3) when the shift fork is not subjected to external P-direction thrust, due to the reset spring Due to the elastic force of the spring, the moving contact and the static contact in the monostable switch are in contact; (4) when the shift fork is pushed upward by the external force in the direction P, the compressed reset spring pushes the monostable switch upward and drives the static contact upward; at the same time, the starting spring is also compressed to move upward. When the switch body contacts the bottom of the stop bolt, the monostable switch stops moving. At this time, the static contact acts as a fulcrum; the shift fork continues to move upward and compresses the reset spring and the starting spring. After the moving contact passes the balance point of the static contact, it flips over. The moving contact and the static contact are in a separated state. At this time, the stop bolt is adjusted to a suitable stop position. (5) When the thrust on the shift fork is weakened, the shift fork moves downward under the action of the starting spring; when the moving contact has not yet passed the balance point of the lower fulcrum, the lower part of the starting spring contacts the monostable switch, pushing the monostable switch downward. After reaching the elastic balance point, the monostable switch stops moving, and the lower fulcrum also stops moving. At this time, under the action of the return spring, the shift fork continues to move downward, driving the moving contact to continue moving downward. After passing the balance point of the lower fulcrum, the moving contact flips over, and the moving contact and the static contact in the monostable switch resume contact. At this time, adjust the starting bolt to a suitable starting position.

[0006] The third technical solution adopted by the present invention to solve the above technical problems is: a double-adjustment pressure automatic switch, including a double-adjustment switch device, a base, a pressure ring, a test spring, a thrust rod and an elastic sealing pad, the base is sealed and connected to the bracket, the base is provided with a pressure ring, an elastic sealing pad, a test spring and a thrust rod, the thrust rod is sleeved with a test spring, the thrust rod is T-shaped, the upper part of which is a rod part, and the bottom is provided with a protrusion, the test spring is supported between the bottom protrusion of the thrust rod and the bracket chassis; a pressure ring is provided between the bracket chassis and the base, and the pressure ring is fixed to the bracket chassis and the The lower end face of the pressure ring abuts against the elastic sealing pad, fixing the elastic sealing pad on the base; a protrusion is provided on the inner periphery of the bottom of the pressure ring; the elastic sealing pad is located on the base, supported between the base and the pressure ring, one side of the elastic sealing pad abuts against the base, and the other side abuts against the pressure ring; the upper end of the thrust rod passes through the bracket chassis and is opposite to the lower end face of the fork, and the lower end abuts against the upper end face of the elastic sealing pad; an adjustment gap is provided between the lower end face of the fork and the upper end face of the thrust rod; the control method of the double-adjustable pressure automatic switch: (1) The elastic force of the reset spring is set to be greater than the flipping force of the moving contact; (2) the length of the upper rod of the shift fork is appropriately set so that when the moving contact has not yet crossed the balance point of the lower fulcrum, the lower part of the starter spring is against the monostable switch; (3) when liquid or gas enters the inlet of the base along the P direction, when the pressure is zero or very weak, the moving contact and the static contact in the monostable switch are in contact, and the double-adjustable pressure automatic switch is in the on state; (4) when the pressure gradually increases, the thrust rod is pushed upward and the test spring is compressed, and the shift fork is pushed upward, thereby compressing the reset spring to push the monostable switch upward and drive the static contact The moving contact point moves upward; when the switch body contacts the bottom of the stop bolt, the monostable switch and the reset spring stop moving. At this time, the static contact acts as a fulcrum, the shift fork continues to move upward and compresses the reset spring and the start spring. The moving contact flips over after crossing the fulcrum balance point. The moving contact and the static contact in the monostable switch are in a separated state, the double-adjustable pressure automatic switch is in a disconnected state, and the stop bolt is adjusted to an appropriate stop position; (5) When the liquid or gas pressure decreases, under the action of the test spring and the start spring, the thrust rod moves downward, and the shift fork also moves downward synchronously;When the moving contact has not passed the balance point of the lower fulcrum, the lower part of the starting spring is against the monostable switch, pushing the monostable switch downward. After reaching the elastic balance point, the monostable switch stops moving, and the lower fulcrum also stops moving. At this time, under the action of the reset spring, the shift fork continues to move downward, driving the moving contact to continue to move downward. After passing the balance point of the lower fulcrum, the moving contact flips, and the moving contact and the static contact in the monostable switch resume contact. At this time, adjust the starting bolt to a suitable starting position. ;

[0007] Compared with the prior art, the advantage of the present invention is that it fundamentally solves the problem that the pressure differential (the difference between the starting value and the stopping value) of various existing pressure switches cannot be adjusted during production and use, and the starting value, stopping value and pressure differential are inconsistent. The starting value, stopping value and pressure differential can be adjusted independently, and the structure is simpler, more practical and more cost-effective than the existing double-adjustment switch. After the use of the switch of the present invention, it can greatly reduce product scrapping and avoid major accidents such as burning motors, laying a solid foundation for product upgrading; it greatly enhances the environmental adaptability of existing products, and significantly improves the technical performance, control accuracy, use performance, service life and economic benefits of existing products. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of the structure of the monostable switch of the present invention;

[0009] Figure 2 This is a schematic diagram of the main structure of the movable contact of the present invention;

[0010] Figure 3 It is a schematic diagram of the top view of the structure of the movable contact of the present invention;

[0011] Figure 4 This is a schematic diagram of the main assembly structure of the movable contact of the present invention;

[0012] Figure 5 It is a schematic diagram of the top view of the structure of the shift fork of the present invention;

[0013] Figure 6 It is a schematic diagram of the main structure of the shift fork of the present invention;

[0014] Figure 7 It is a bottom view structural schematic diagram of the shift fork of the present invention;

[0015] Figure 8 This is a schematic diagram of the main structure of the starting spring pad of the present invention;

[0016] Fig. 9 It is a schematic diagram of the top view of the starting spring pad of the present invention;

[0017] Fig.10It is a structural schematic diagram of the double-adjusting switch device of the present invention when the moving contact and the stationary contact are in contact state;

[0018] Fig.11 It is a structural schematic diagram of the double-adjusting switch device of the present invention when the moving contact and the static contact are in a separated state;

[0019] Fig.12 It is a schematic diagram of the adjustment structure of the double adjustment device of the present invention;

[0020] Fig.13 It is a structural schematic diagram of the stop bolt of the present invention;

[0021] Fig.14 It is a schematic diagram of the top view of the starting bolt of the present invention;

[0022] Fig.15 This is a schematic diagram of the main structure of the starting bolt of the present invention;

[0023] Fig.16 It is a bottom view structural schematic diagram of the starting bolt of the present invention;

[0024] Fig.17 It is a structural schematic diagram of the double-adjustable pressure automatic switch of the present invention when the moving contact and the static contact are in contact state;

[0025] Fig.18 It is a structural schematic diagram of the double-adjustable pressure automatic switch of the present invention when the moving contact and the static contact are in a separated state;

[0026] Fig.19 It is a structural schematic diagram of the double-adjustable pressure automatic switch of the present invention when the moving contact and the static contact are in contact state;

[0027] Fig. 20 The present invention is a schematic structural diagram of a double-adjustable pressure automatic switch when the moving contact and the stationary contact are in a separated state.

[0028] In the above figure:

[0029] 1. Switch body, 2. Static contact, 3. Lower fulcrum, 4. Lower fulcrum seat, 5. Reset spring, 6. Contact spring, 7. Moving contact, 8. Fork, 9. Bracket, 10. Stop bolt, 11. Start bolt, 12. Start spring, 13. Support spring, 14. Start spring pad, 15. Bracket chassis, 16. Pressure ring, 17. Test spring, 18. Thrust rod, 19. Elastic sealing pad, 20. Base. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings:

[0031] Embodiment 1: Figure 1 to Figure 9As shown, a monostable switch comprises a switch body 1, wherein the switch body 1 is provided with an upper through hole and a lower through hole, wherein a switch device is provided in the switch body 1, wherein the switch device comprises a reset spring 5, a shift fork 8, a static contact 2, a moving contact 7, a lower fulcrum 3 and a lower fulcrum seat 4, wherein the static contact 2 is provided in the upper part of the switch body 1, and the lower fulcrum 3 is provided on the corresponding lower fulcrum seat 4 in the lower part of the switch body 1; the upper end of the shift fork 8 passes through the upper through hole, and the lower end passes through the lower through hole, wherein the upper through hole and the lower through hole are both polygonal inner through holes, and the upper and lower ends of the shift fork 8 are both provided to be aligned with the polygon A polygonal cylinder adapted to the inner through hole of the switch body 1 is provided to ensure that the upper and lower ends of the shift fork 8 will not deflect as a whole when passing through the polygonal inner through hole on the switch body 1; the shift fork 8 can move linearly up and down in the switch body 1, and the shift fork 8 is also provided with upper and lower limit protrusions; the lower limit protrusion is supported on the switch body 1; a reset spring 5 is also sleeved on the polygonal cylinder at the upper end of the shift fork 8, which is supported between the switch body 1 and the upper limit protrusion on the shift fork 8; the shift fork 8 is also provided with a contact spring 6, the two ends of which are respectively supported on the symmetrical protrusions at the two ends of the moving contact 7 (such as Figure 2-Figure 4 As shown), the moving contact 7 is sleeved on the fork 8 and can freely flip up and down on the fork 8 to close and open the switch device; in the absence of any external force pushing the fork 8, the monostable switch always remains in a closed state.

[0032] Embodiment 2: Figure 1As shown in FIG. 8, a double-adjustment switch device includes a double-adjustment device, a support spring 13 and a monostable switch, wherein the double-adjustment device includes a bracket 9, a stop bolt 10, a start bolt 11 and a start spring 12; a stop bolt 10 is screwed into the top of the bracket 9, the stop bolt 10 is a hollow bolt, the start bolt 11 is screwed into the stop bolt 10, and can be rotated up and down in the hollow of the stop bolt 10 for adjustment; the start spring 12 is arranged between the start bolt 11 and the shift fork 8, the upper part of which is against the start bolt 11, and the lower part is against the shift fork 8; a guide rail structure is arranged on the bracket 9, the switch body 1 is arranged in the middle of the bracket 9, the lower part of which is against the support spring 13, and can be moved along the guide rail structure on the bracket 9 The stop bolt 10 and the support spring 13 can move freely up and down; a support chassis 15 is provided at the bottom of the support 9, and the support chassis 15 is rigidly connected to the support 9, and the two ends of the support spring 13 are supported between the switch body 1 and the support chassis 15 respectively; a control method for a double-adjustment switch device: (1) the elastic force of the reset spring 5 is set to be greater than the turning force of the moving contact 7; (2) the length of the upper rod of the shift fork 8 is appropriately set so that when the moving contact 7 has not crossed the balance point of the lower fulcrum 3, the lower part of the start spring 12 is against the monostable switch; (3) when the shift fork 8 is not subjected to external P-direction thrust, due to the elastic force of the reset spring 5, the moving contact 7 in the monostable switch is in contact with the static contact 2 (such as Fig.10 As shown); (4) When the shift fork 8 is pushed upward by the external force in the direction P, the compressed reset spring 5 pushes the monostable switch upward and drives the static contact 2 upward; at the same time, the starting spring 12 is also compressed to move upward. When the switch body 1 abuts against the bottom of the stop bolt 10, the monostable switch stops moving. At this time, the static contact 2 acts as a fulcrum; the shift fork 8 continues to move upward and compresses the reset spring 5 and the starting spring 12. The moving contact 7 flips over after passing the balance point of the static contact, and the moving contact and the static contact are in a separated state (as shown in FIG. Fig.11 As shown), at this time, adjust the stop bolt to a suitable stop position; (5) when the thrust on the shift fork is weakened, under the action of the starting spring 12, the shift fork 8 moves downward; when the moving contact 7 has not yet passed the balance point of the lower fulcrum 3, the lower part of the starting spring 12 is against the monostable switch, pushing the monostable switch to move downward. After reaching the elastic balance point, the monostable switch stops moving, and the lower fulcrum 3 also stops moving. At this time, under the action of the reset spring 5, the shift fork 8 continues to move downward, driving the moving contact 7 to continue to move downward. After passing the balance point of the lower fulcrum 3, the moving contact 7 flips over, and the moving contact 7 in the monostable switch resumes the contact state with the static contact 2. At this time, adjust the starting bolt 11 to a suitable starting position.

[0033] Embodiment 3: Figure 1 — Fig.10 As shown, a double-adjustment pressure automatic switch includes a double-adjustment switch device, a base 20, a pressure ring 16, a test spring 17, a thrust rod 18 and an elastic sealing pad 19. The base 20 is sealed and connected to the bracket chassis 15. The base 20 is provided with a pressure ring 16, a test spring 17, a thrust rod 18 and an elastic sealing pad 19. The inner periphery of the bottom of the pressure ring 16 is provided with a protrusion. The thrust rod 18 is sleeved with a test spring 17. The thrust rod 18 is T-shaped, with a rod portion at the upper part and a protrusion at the bottom. The test spring 17 is supported between the bottom protrusion of the thrust rod 18 and the bracket chassis 15, and the lower end surface of the bottom protrusion of the thrust rod 18 falls on the protrusion set on the inner periphery of the bottom of the pressure ring 16; a pressure ring 16 is set between the bracket chassis 15 and the base 20, and the pressure ring 16 is fixed between the bracket chassis 15 and the base 20, and the lower end surface of the pressure ring 16 is against the elastic sealing pad 19, fixing the elastic sealing pad 19 on the base 20; the elastic The sealing pad 19 is located on the base 20 and fixed between the base 20 and the pressure ring 16, with one side of the sealing pad abutting against the base 20 and the other side abutting against the pressure ring 16; the upper end of the thrust rod 18 passes through the bracket chassis 15 and faces the lower end face of the fork 8, and the lower end abuts against the upper end face of the elastic sealing pad 19; an adjustable gap is provided between the lower end face of the fork 8 and the upper end face of the thrust rod 18; a control method for a double-adjustment type pressure automatic switch: (1) the reset spring is adjusted The elastic force of the spring 5 is set to be greater than the turning force of the moving contact 7; (2) a starting spring pad 14 is provided between the starting spring 12 and the shift fork 8, and the length of the upper rod of the shift fork 8 is appropriately set so that when the moving contact 7 has not yet crossed the lower fulcrum balance point, the lower part of the starting spring pad 14 abuts against the monostable switch; (3) when liquid or gas enters the inlet of the base 20 along the P direction, when the pressure is zero or very weak, the moving contact 7 in the monostable switch is in contact with the static contact 2, and the double-adjustable pressure automatic switch is in the on state (such as Fig.17As shown); (4) When the pressure gradually increases, the thrust rod 18 is pushed upward and the test spring 17 is compressed, and the shift fork 8 is pushed upward, thereby compressing the reset spring 5 to push the monostable switch upward, and driving the static contact 2 to move upward, and compressing the start spring 12 to move upward; when the switch body 1 abuts against the bottom of the stop bolt 10, the monostable switch stops moving. At this time, the static contact 2 acts as a fulcrum, and the shift fork 8 continues to move upward and compresses the reset spring 5 and the start spring 12. The moving contact 7 flips over after exceeding the fulcrum balance point of the static contact 2, and the moving contact 7 and the static contact 2 in the monostable switch are in a separated state (as shown in FIG. Fig.10 As shown), the double-adjustable pressure automatic switch is in the disconnected state (as shown Fig.18 As shown), adjust the stop bolt 10 to the appropriate stop position; (5) When the liquid or gas pressure decreases, the thrust on the thrust rod 18 and the fork 8 decreases, and under the action of the starting spring 12, the monostable switch is pushed downward. After reaching the elastic balance point between the starting spring 12 and the supporting spring 13, the monostable switch stops moving. At this time, the lower fulcrum 3 plays a supporting role, and the fork 8 continues to move downward under the elastic force of the return spring 5, while the thrust rod 18 also moves downward synchronously under the elastic force of the test spring 17. After the moving contact 7 passes the balance point of the lower fulcrum 3, it flips over, and the moving contact 7 and the static contact 2 resume the contact state, and the double-adjustable pressure automatic switch immediately enters the on state; at this time, adjust the starting bolt 11 to the appropriate starting position.

[0034] Embodiment 4: Figure 1 — Fig. 20As shown, a double-adjustment pressure automatic switch includes a double-adjustment switch device, a base 20, a pressure ring 16, a test spring 17, a thrust rod 18 and an elastic sealing pad 19; the base 20 is sealed and connected to the bracket chassis 15, and the base 20 is provided with a pressure ring 16, a test spring 17, a thrust rod 18 and an elastic sealing pad 19, the bottom inner periphery of the pressure ring 16 is provided with a protrusion, the thrust rod 18 is sleeved with a test spring 17, the thrust rod 18 is T-shaped, the upper part of which is a rod part, and the bottom is provided with a protrusion, the test spring 17 is supported between the bottom protrusion of the thrust rod 18 and the bracket chassis 15, and the lower end surface of the bottom protrusion of the thrust rod 18 falls on the protrusion provided on the inner periphery of the bottom of the pressure ring 16; a pressure ring 16 is provided between the bracket chassis 15 and the base 20, and the pressure ring 16 is fixed between the bracket chassis 15 and the base 20, and the pressure The lower end surface of the ring 16 abuts against the elastic sealing pad 19, and the elastic sealing pad 19 is fixed on the base 20; the elastic sealing pad 19 is located on the base 20 and fixed between the base 20 and the pressure ring 16, one side of which abuts against the base 20, and the other side abuts against the pressure ring 16; the upper end of the thrust rod 18 passes through the bracket chassis 15 and is opposite to the lower end surface of the fork 8, and the lower end abuts against the upper end surface of the elastic sealing pad 19; an adjustable gap is provided between the lower end surface of the fork 8 and the upper end surface of the thrust rod 18; the control method of the double-adjustable pressure automatic switch: (1) the elastic force of the reset spring 5 is set to be greater than the flipping force of the moving contact 7; the contact spring 6 in the moving contact 7 is set to two symmetrical ones, and symmetrical contact spring seats are provided on both sides of the middle of the fork 8, and the contact spring 6 is installed between the fork 8 and the moving contact 7 (such as Figure 2-Figure 4 (2) The length of the upper rod of the shift fork 8 is appropriately set so that when the moving contact 7 has not yet crossed the lower fulcrum balance point, the lower part of the start spring pad 14 abuts against the monostable switch; (3) When liquid or gas enters the inlet of the base 20 along the P direction, when the pressure is zero or very weak, the moving contact 7 in the monostable switch is in contact with the static contact 2, and the double-adjustable pressure automatic switch is in the on state (as shown in FIG. Fig.17As shown); (4) When the pressure gradually increases, the thrust rod 18 is pushed upward and the test spring 17 is compressed, and the shift fork 8 is pushed upward, thereby compressing the reset spring 5 to push the monostable switch upward, and driving the static contact 2 to move upward, and compressing the start spring 12 to move upward; when the switch body 1 abuts against the bottom of the stop bolt 10, the monostable switch stops moving. At this time, the static contact 2 acts as a fulcrum, and the shift fork 8 continues to move upward and compresses the reset spring 5 and the start spring 12. The moving contact 7 flips over after exceeding the fulcrum balance point of the static contact 2, and the moving contact 7 and the static contact 2 in the monostable switch are in a separated state (as shown in FIG. Fig.11 As shown), the double-adjustable pressure automatic switch is in the disconnected state (as shown Fig. 20 As shown), adjust the stop bolt 10 to the appropriate stop position; (5) When the liquid or gas pressure decreases, the thrust on the thrust rod 18 and the fork 8 decreases, and under the action of the starting spring 12, the monostable switch is pushed downward. After reaching the elastic balance point between the starting spring 12 and the supporting spring 13, the monostable switch stops moving. At this time, the lower fulcrum 3 plays a supporting role, and the fork 8 continues to move downward under the elastic force of the return spring 5, while the thrust rod 18 also moves downward synchronously under the elastic force of the test spring 17. After the moving contact 7 passes the balance point of the lower fulcrum 3, it flips over, and the moving contact 7 and the static contact 2 resume the contact state, and the double-adjustable pressure automatic switch immediately enters the on state; at this time, adjust the starting bolt 11 to the appropriate starting position.

[0035] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and inventive concept of the present invention should fall within the protection scope of the claims attached to the present invention.

Claims

1. A control method for a double-adjusting switch device, characterized in that: The double-adjustment switch device comprises a double-adjustment device, a support spring and a monostable switch; The monostable switch comprises a switch body and a switch device, wherein the switch body is provided with the switch device, wherein the switch device comprises a reset spring, a shift fork, a static contact, a moving contact, and a lower fulcrum, wherein the static contact is provided in the upper part of the switch body, and the lower fulcrum is provided at a corresponding position in the lower part of the switch body; a guide structure is provided on the switch body so that the shift fork can move linearly up and down in the switch body; and a moving contact is provided on the shift fork for closing and opening the switch device; A return spring is also provided on its upper part, which is used to keep the switch device in a closed monostable state without any external interference; The switch body is provided with an upper through hole and a lower through hole, and the switch device includes a reset spring, a shift fork, a static contact, a moving contact, a lower fulcrum and a lower fulcrum seat, wherein the static contact is arranged at the upper part of the switch body, and the lower fulcrum is arranged on the lower fulcrum seat corresponding to the lower part of the switch body; the upper end of the shift fork passes through the upper through hole, and the lower end passes through the lower through hole, and both the upper through hole and the lower through hole are polygonal inner through holes, and the upper and lower ends of the shift fork are both arranged as polygonal cylinders adapted to the polygonal inner through hole, so as to ensure that the upper and lower ends of the shift fork will not deflect as a whole when passing through the polygonal inner through hole on the switch body; The shift fork can move linearly up and down in the switch body, and the shift fork is also provided with upper and lower limit protrusions; the lower limit protrusion is supported on the switch body; a reset spring is also sleeved on the polygonal cylinder at the upper end of the shift fork, which is supported between the switch body and the upper limit protrusion on the shift fork; a contact spring is also provided on the shift fork, and its two ends are respectively supported on the symmetrical protrusions at the two ends of the moving contact; the moving contact is sleeved on the shift fork and can freely flip up and down on the shift fork for closing and opening the switch device; in the absence of any external force pushing the shift fork, the monostable switch always remains in a closed state; The double-adjustment device comprises a bracket, a stop bolt, a start bolt and a start spring; a stop bolt is screwed inside the top of the bracket, the stop bolt is a hollow bolt, the start bolt is screwed to the stop bolt, and can be rotated up and down in the hollow of the stop bolt for adjustment; the start spring is arranged between the start bolt and the shift fork, the upper part of which is against the start bolt, and the lower part is against the shift fork; a guide rail structure is arranged on the bracket, the switch body is arranged in the middle of the bracket, the lower part of which is against the support spring, and can move freely up and down between the stop bolt and the support spring along the guide rail structure on the bracket; a bracket chassis is arranged at the bottom of the bracket, the bracket chassis is rigidly connected to the bracket, and the two ends of the support spring are respectively supported between the switch body and the bracket chassis; The method comprises the following steps: (1) setting the elastic force of the reset spring to be greater than the flipping force of the moving contact; (2) appropriately setting the length of the upper rod of the shift fork so that when the moving contact has not yet crossed the lower fulcrum balance point, the lower part of the starting spring abuts against the monostable switch; (3) when the shift fork is not subjected to an external P-direction thrust, the moving contact and the static contact in the monostable switch are in contact due to the elastic force of the reset spring; (4) when the shift fork is subjected to an external P-direction thrust and moves upward, the reset spring is compressed to push the monostable switch upward and drive the static contact upward; at the same time, the starting spring is also compressed to move upward, and when the switch body abuts against the bottom of the stop bolt, the monostable switch stops moving, and at this time, the static contact acts as a fulcrum; the shift fork continues to move upward and compresses the reset spring and Starting spring, the moving contact flips over after passing the balance point of the static contact, and the moving contact and the static contact are in a separated state. At this time, adjust the stop bolt to a suitable stop position; (5) When the thrust on the shift fork is weakened, the shift fork moves downward under the action of the starting spring; when the moving contact has not yet passed the balance point of the lower fulcrum, the lower part of the starting spring resists against the monostable switch, pushing the monostable switch to move downward. After reaching the elastic balance point, the monostable switch stops moving, and the lower fulcrum also stops moving. At this time, under the action of the reset spring, the shift fork continues to move downward, driving the moving contact to continue moving downward. After passing the balance point of the lower fulcrum, the moving contact flips over, and the moving contact and the static contact in the monostable switch resume contact. At this time, adjust the starting bolt to a suitable starting position.

2. A control method for a double-adjustable pressure automatic switch: characterized in that: The double-adjustment type pressure automatic switch comprises a double-adjustment switch device, a base, a pressure ring, a test spring, a thrust rod and an elastic sealing pad; the double-adjustment switch device comprises a double-adjustment device, a support spring and a monostable switch; The monostable switch comprises a switch body and a switch device, wherein the switch body is provided with the switch device, wherein the switch device comprises a reset spring, a shift fork, a static contact, a moving contact, and a lower fulcrum, wherein the static contact is provided in the upper part of the switch body, and the lower fulcrum is provided at a corresponding position in the lower part of the switch body; a guide structure is provided on the switch body so that the shift fork can move linearly up and down in the switch body; and a moving contact is provided on the shift fork for closing and opening the switch device; A return spring is also provided on its upper part, which is used to keep the switch device in a closed monostable state without any external interference; The switch body is provided with an upper through hole and a lower through hole, and the switch device includes a reset spring, a shift fork, a static contact, a moving contact, a lower fulcrum and a lower fulcrum seat, wherein the static contact is arranged at the upper part of the switch body, and the lower fulcrum is arranged on the lower fulcrum seat corresponding to the lower part of the switch body; the upper end of the shift fork passes through the upper through hole, and the lower end passes through the lower through hole, and both the upper through hole and the lower through hole are polygonal inner through holes, and the upper and lower ends of the shift fork are both arranged as polygonal cylinders adapted to the polygonal inner through hole, so as to ensure that the upper and lower ends of the shift fork will not deflect as a whole when passing through the polygonal inner through hole on the switch body; The shift fork can move linearly up and down in the switch body, and the shift fork is also provided with upper and lower limit protrusions; the lower limit protrusion is supported on the switch body; a reset spring is also sleeved on the polygonal cylinder at the upper end of the shift fork, which is supported between the switch body and the upper limit protrusion on the shift fork; a contact spring is also provided on the shift fork, and its two ends are respectively supported on the symmetrical protrusions at the two ends of the moving contact; the moving contact is sleeved on the shift fork and can freely flip up and down on the shift fork for closing and opening the switch device; in the absence of any external force pushing the shift fork, the monostable switch always remains in a closed state; The double-adjustment device comprises a bracket, a stop bolt, a start bolt and a start spring; a stop bolt is screwed inside the top of the bracket, the stop bolt is a hollow bolt, the start bolt is screwed to the stop bolt, and can be rotated up and down in the hollow of the stop bolt for adjustment; the start spring is arranged between the start bolt and the shift fork, the upper part of which is against the start bolt, and the lower part is against the shift fork; a guide rail structure is arranged on the bracket, the switch body is arranged in the middle of the bracket, the lower part of which is against the support spring, and can move freely up and down between the stop bolt and the support spring along the guide rail structure on the bracket; a bracket chassis is arranged at the bottom of the bracket, the bracket chassis is rigidly connected to the bracket, and the two ends of the support spring are respectively supported between the switch body and the bracket chassis; The base is sealed and connected to the bracket. A pressure ring, an elastic sealing pad, a test spring and a thrust rod are arranged in the base. The thrust rod is sleeved with a test spring. The thrust rod is T-shaped, with a rod portion at the upper part and a protrusion at the bottom. The test spring is supported between the bottom protrusion of the thrust rod and the bracket chassis. A pressure ring is arranged between the bracket chassis and the base. The pressure ring is fixed between the bracket chassis and the base. The lower end face of the pressure ring abuts against the elastic sealing pad to fix the elastic sealing pad on the base. A protrusion is arranged on the inner periphery of the bottom of the pressure ring. The elastic sealing pad is located on the base and supported between the base and the pressure ring. One side of the elastic sealing pad abuts against the base and the other side abuts against the pressure ring. The upper end of the thrust rod passes through the bracket chassis and is opposite to the lower end face of the shift fork, and the lower end abuts against the upper end face of the elastic sealing pad. An adjustment gap is arranged between the lower end face of the shift fork and the upper end face of the thrust rod. The method comprises the following steps: (1) setting the elastic force of the reset spring to be greater than the flipping force of the moving contact; (2) appropriately setting the length of the upper rod portion of the shift fork so that when the moving contact has not yet crossed the lower fulcrum balance point, the lower portion of the starter spring abuts against the monostable switch; (3) when liquid or gas enters the inlet of the base along the P direction, under the condition of zero or very weak pressure, the moving contact and the static contact in the monostable switch are in contact, and the double-adjustable pressure automatic switch is in the on state; (4) when the pressure gradually increases, the thrust rod is pushed upward and the test spring is compressed, and the shift fork is pushed upward, thereby compressing the reset spring to push the monostable switch upward and drive the static contact to move upward; when the switch body abuts against the bottom of the stop bolt, the monostable switch and the reset spring stop moving, at which time the static contact acts as a fulcrum, and the shift fork continues to move upward and compresses the reset spring and the starter spring. The moving contact flips over after crossing the fulcrum balance point, the moving contact and the static contact in the monostable switch are in a separated state, the double-adjustable pressure automatic switch is in a disconnected state, and the stop bolt is adjusted to an appropriate stop position; (5) When the liquid or gas pressure decreases, under the action of the test spring and the start spring, the thrust rod moves downward, and the shift fork also moves downward synchronously; when the moving contact has not yet crossed the lower fulcrum balance point, the lower part of the start spring resists against the monostable switch, pushing the monostable switch to move downward, and after reaching the elastic balance point, the monostable switch stops moving, and the lower fulcrum also stops moving. At this time, under the action of the reset spring, the shift fork continues to move downward, driving the moving contact to continue to move downward, and after crossing the lower fulcrum balance point, the moving contact flips over, and the moving contact and the static contact in the monostable switch resume contact. At this time, adjust the start bolt to an appropriate start position.

3. The control method of a double-adjustable pressure automatic switch according to claim 2 is characterized in that: The invention comprises the following steps: (1) setting the elastic force of the reset spring to be greater than the flipping force of the moving contact; (2) providing a start spring pad between the start spring and the shift fork, and appropriately setting the length of the upper rod of the shift fork so that when the moving contact has not yet crossed the balance point of the lower fulcrum, the lower part of the start spring pad abuts against the monostable switch; (3) when liquid or gas enters the inlet of the base along the P direction, under the condition of zero or very weak pressure, the moving contact and the static contact in the monostable switch are in contact, and the double-adjustable pressure automatic switch is in the on state; (4) when the pressure gradually increases, the thrust rod is pushed upward to compress the test spring, and the shift fork is pushed upward to compress the reset spring to push the monostable switch upward, and drive the static contact to move upward, and compress the start spring to move upward; when the switch body abuts against the bottom of the stop bolt, the monostable switch stops moving, and at this time, the static contact acts as a fulcrum, and the shift fork continues to move upward to compress the reset spring and the start spring. Spring, the moving contact flips over after exceeding the static contact fulcrum balance point, the moving contact and the static contact in the monostable switch are in a separated state, the double-adjustment type pressure automatic switch is in a disconnected state, and the stop bolt is adjusted to an appropriate stop position; (5) When the liquid or gas pressure decreases, the thrust on the thrust rod and the fork decreases, and under the action of the starting spring, the monostable switch is pushed downward. After reaching the elastic balance point of the starting spring and the supporting spring, the monostable switch stops moving. At this time, the lower fulcrum plays a supporting role, and the fork continues to move downward under the elastic force of the reset spring, and the thrust rod also moves downward synchronously under the elastic force of the test spring. After the moving contact passes the lower fulcrum balance point, it flips over, and the moving contact and the static contact resume contact, and the double-adjustment type pressure automatic switch immediately enters the connected state; at this time, the starting bolt is adjusted to an appropriate starting position.

4. A control method for a double-adjustable pressure automatic switch according to claim 2, characterized in that: (1) The elastic force of the reset spring is set to be greater than the flipping force of the moving contact; the contact spring in the moving contact is set to be two symmetrical springs, and symmetrical contact spring seats are set on both sides of the middle of the fork, and the contact spring device is between the fork and the moving contact; (2) The length of the upper rod of the fork is appropriately set so that when the moving contact has not crossed the lower fulcrum balance point, the lower part of the starting spring pad is against the monostable switch; (3) When liquid or gas enters the inlet of the base along the P direction, when the pressure is zero or very weak, the moving contact and the static contact in the monostable switch are in contact, and the double-adjustable pressure automatic switch is in the on state; (4) When the pressure gradually increases, the thrust rod is pushed upward and the test spring is compressed, and the fork is pushed upward, thereby compressing the reset spring to push the monostable switch upward, and drive the static contact to move upward, and compress the starting spring to move upward; when the switch body is against the bottom of the stop bolt, the monostable switch stops moving, at this time the static contact acts as a fulcrum, and the fork Continue to move upward and compress the reset spring and the starting spring. The moving contact flips over after exceeding the balance point of the static contact fulcrum. The moving contact and the static contact in the monostable switch are in a separated state. The double-adjustment type pressure automatic switch is in a disconnected state. The stop bolt is adjusted to an appropriate stop position. (5) When the liquid or gas pressure decreases, the thrust force on the thrust rod and the fork decreases. Under the action of the starting spring, the monostable switch is pushed downward. After reaching the elastic balance point of the starting spring and the supporting spring, the monostable switch stops moving. At this time, the lower fulcrum plays a supporting role. The fork continues to move downward under the elastic force of the reset spring, and the thrust rod also moves downward synchronously under the elastic force of the test spring. After the moving contact passes the balance point of the lower fulcrum, it flips over. The moving contact and the static contact resume contact. The double-adjustment type pressure automatic switch immediately enters the connected state. At this time, the starting bolt is adjusted to an appropriate starting position.

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