Direct pressure type travel switch

Abstract

The invention relates to a direct pressure type travel switch, and belongs to the technical field of travel switches, the direct pressure type travel switch comprises a shell, at least one group of reeds is arranged in the shell, each group of reeds comprises at least two reed monomers which are distributed at intervals, and each reed monomer is provided with a contact; and the pressing assembly comprises a button which is movably connected with the shell and extends to the side of the reed single body. When the button is pushed by an external object, the electric conductor moves along the length direction of the reed single body, so that the contacts can be mutually connected or disconnected, and the on-off of a circuit is controlled; the press-down stroke of the button can be adjusted in cooperation with a stroke adjusting block, and triggering can be conveniently conducted in cooperation with external equipment; the pressing direction of the control button is consistent with the length direction of the reed single bodies, so that the reed single bodies can be laterally distributed beside the button side by side at intervals, the width of the shell can be reduced, narrow space layout is achieved, and the miniaturization design requirement is met.

Description

Technical Field

[0001] This application relates to the field of limit switch technology, and in particular to a direct-pressure limit switch. Background Technology

[0002] Limit switches are components that control the mechanical movement of a circuit to open or close it. They typically have extremely high switching efficiency and low energy consumption, and are widely used in aerospace, electronics, transportation, and industrial fields. Due to their simple structure, strong anti-interference ability, and high reliability, limit switches can undertake the task of controlling important command signals in product control systems.

[0003] Direct-pressure limit switches generally consist of components such as a push rod, a pressure spring, normally open contacts, and normally closed contacts. Circuit switching is achieved by the moving parts pushing the contacts to open or close. "Direct pressure" means that the movement path of the moving parts is a straight line, and the working force of the switch is applied in that straight line direction. As product control systems increasingly demand high precision, miniaturization, simplification, high reliability, and environmental resistance from components, the need for large switching strokes and stable and reliable contact dynamic characteristics within confined spaces has emerged.

[0004] Therefore, it is necessary to provide a direct-pressure limit switch that features convenient interface with external systems, easy locking and clamping, full-stroke adjustable, and adaptability to installation in confined spaces, thus meeting the development needs of product control systems. Summary of the Invention

[0005] To address any of the shortcomings or deficiencies mentioned in the background technology, this application provides a direct-pressure limit switch, which has the advantages of convenient interface with external systems, easy locking and clamping, full-stroke adjustment, and adaptability to installation and use in confined spaces.

[0006] This application provides a direct-pressure limit switch, including: The housing has at least one set of springs inside, and the set of springs includes at least two spring units spaced apart, each of which has a contact point. The pressing assembly includes a button movably connected to the housing and extending to the side of the reed unit, and a spring disposed within the housing for supporting the button. The pressing direction of the button is consistent with the length direction of the reed unit. One end of the button located inside the housing is provided with a conductor for conducting the contact, and the other end located outside the housing is threadedly connected with a stroke adjustment block.

[0007] In some embodiments, the housing contains two sets of spring contacts symmetrically distributed on both sides of the button, and there are two conductors used to respectively connect the contacts on the two sets of spring contacts.

[0008] In some embodiments, the housing is provided with a spring seat cover that partially accommodates the button, with one end of the spring seat cover open and the other end fitted with a spring seat; The side wall of the spring seat cover is provided with a vertically extending strip groove, and the inner wall of the spring seat cover is provided with a through hole communicating with the strip groove. One end of the reed is clamped and fixed between the spring seat cover and the spring seat, and the other end extends into the strip groove, with the contact point on it entering the spring seat cover through the through hole.

[0009] In some embodiments, the reed unit has a clamping end and a free end, the clamping end being Z-shaped and extending out of the spring seat to form a pin, and the free end being bent into a U-shaped protrusion that passes through the through hole to form the contact.

[0010] In some embodiments, the spring is located inside the spring seat cover, and a guide post is provided inside the spring seat cover. One end of the spring is sleeved on the guide post, and the other end abuts against the button.

[0011] In some embodiments, the housing includes an outer shell that houses the spring seat cover and the spring seat, and a base connected to the outer shell, the base having a through hole that matches the sliding motion of the button; The side wall of the housing is provided with a connector socket that is electrically connected to the pin, and the end of the housing where the base is mounted is provided with a flange and a sealing ring mounting groove.

[0012] In some embodiments, the button includes a push rod that slides to match the through hole, and an insulating block located inside the spring seat cover and sleeved on the push rod, the conductor being fixed to the insulating block, and the push rod having a guide groove for accommodating the spring and the guide post.

[0013] In some embodiments, the end of the push rod away from the insulating block is provided with a threaded section that matches the stroke adjustment block, and the push rod is provided with a stop block and a riveted edge that respectively abut against the upper and lower end faces of the insulating block.

[0014] In some embodiments, the base is provided with a guide sleeve that cooperates with the push rod and is used to stop the stroke adjustment block. The guide sleeve is provided with an annular groove, and a sealing ring that slides in contact with the push rod is provided in the annular groove.

[0015] In some embodiments, the push rod is provided with a radially extending pin hole, and the sidewall of the guide sleeve is provided with an insertion hole for aligning the pin hole.

[0016] The beneficial effects of the technical solution provided in this application include: This application provides a direct-pressure limit switch. The switch has a housing containing at least one set of reeds, each set comprising at least two spaced-apart reed units, each reed unit having a contact. A pressing assembly includes a button movably connected to the housing and extending to the side of the reed unit, and a spring disposed within the housing to support the button. The pressing direction of the button is consistent with the length direction of the reed unit. One end of the button inside the housing has a conductor for energizing the contact, and the other end outside the housing is threadedly connected to a travel adjustment block.

[0017] Therefore, when an external object pushes the button, the conductor moves along the length of the reed unit, which can make each contact connect or disconnect with each other, thereby controlling the circuit's on / off state. With the help of the travel adjustment block, the button's pressing travel can be adjusted, making it convenient to trigger with external devices. The control button's pressing direction is consistent with the length direction of the reed unit, so that the reed units can be distributed laterally side by side on the side of the button, thereby reducing the width of the casing, realizing a layout in a small space, and meeting the requirements of miniaturization design. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the direct-pressure limit switch according to an embodiment of this application; Figure 2 This is a schematic diagram of the button structure according to an embodiment of this application; Figure 3 This is a schematic diagram showing the connection between the spring seat and the spring seat cover in an embodiment of this application; Figure 4 This is a side cross-sectional view of a reed unit according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the base according to an embodiment of this application; Figure 6 This is a schematic diagram of the top rod structure according to an embodiment of this application; Figure 7 This is a schematic diagram of the direct-pressure limit switch from another perspective, representing an embodiment of this application. Figure 8 This is a schematic diagram of the stroke adjustment block according to an embodiment of this application; Figure 9 This is a schematic diagram of the stroke adjustment block according to another embodiment of this application; Figure 10This is a schematic diagram of the stroke adjustment block according to another embodiment of this application.

[0020] The attached diagram lists the components represented by each number as follows: 1. Housing; 2. Base; 3. Spring; 4. Button; 5. Sealing ring; 6. Spring; 7. Connector socket; 8. Stroke adjustment block; 9. Push rod; 10. Conductor; 11. Insulating block; 12. Screw; 13. Spring seat; 14. Spring seat cover; 15. Spring single piece; 16. Guide post; 17. Annular groove; 18. Through hole; 19. Insertion hole; 20. Guide sleeve; 21. Guide groove; 22. Stop; 23. Riveted edge; 24. Pin hole; 25. Threaded section; 26. Flange; 27. Sealing ring mounting groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] To address any of the shortcomings or deficiencies mentioned in the background technology, this application provides a direct-pressure limit switch, which has the advantages of convenient interface with external systems, easy locking and clamping, full-stroke adjustment, and adaptability to installation and use in confined spaces.

[0023] See Figures 1 to 10 As shown, this application embodiment provides a direct-pressure limit switch, including: The housing has at least one set of springs 3 inside, and the set of springs 3 includes at least two spaced spring units 15, each of which is provided with a contact point; The pressing assembly includes a button 4 that is movably connected to the housing and extends to the side of the reed unit 15, and a spring 6 disposed inside the housing for supporting the button 4. The pressing direction of the button 4 is consistent with the length direction of the reed unit 15. One end of the button 4 located inside the housing is provided with a conductor 10 for making contact, and the other end located outside the housing is threadedly connected with a stroke adjustment block 8.

[0024] The direct-pressure limit switch of this application embodiment sets the arrangement of the reed unit 15 and the button 4, and controls the pressing direction of the button 4 to be consistent with the length direction of the reed unit 15, so that the reed units 15 can be distributed side by side on the side of the button 4, thereby reducing the width of the housing 1 and realizing a layout in a small space.

[0025] When an external object pushes button 4, the conductor 10 moves along the length of the reed unit 15, forcing the contacts to either connect or disconnect, thereby controlling the circuit's on / off state. Additionally, the travel adjustment block 8 can adjust the maximum pressing travel of button 4 via a thread, facilitating triggering with external devices.

[0026] Specifically, a set of reeds 3 includes four reed units 15. The four reed units 15 extend vertically and are arranged side by side and spaced apart inside the housing. There is a gap between the four reed units 15 and the side wall of the housing. Each reed unit 15 is provided with a contact point. The end of the reed unit 15 away from the contact point is fixedly installed. The button 4 extends to the side of the four reed units 15. The pressing direction is consistent with the length direction of the reed unit 15. This makes full use of the space inside the housing and can be used in narrow spaces.

[0027] For example, the direct-pressure limit switch in this embodiment is a normally closed switch. When in use, the housing is pre-installed and connected to the external system, and the travel adjustment block 8 is rotated and adjusted in advance so that the travel adjustment block 8 and the button 4 are in a suitable relative position.

[0028] When an external object pushes button 4, button 4 causes conductor 10 to move along the length of spring unit 15. Conductor 10 simultaneously disengages from each contact, breaking the circuit. At the same time, the travel adjustment block 8 abuts against the housing, keeping the circuit in the open state. When the pressure is released, spring 6 pushes button 4 back to its original position, and conductor 10 simultaneously contacts each contact, making the circuit conductive.

[0029] In some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a direct-pressure limit switch. The direct-pressure limit switch has two sets of springs 3 inside the housing. The two sets of springs 3 are symmetrically distributed on both sides of the button 4. There are two conductors 10, which are used to respectively connect the contacts on the two sets of springs 3.

[0030] The direct-pressure limit switch of this application embodiment can achieve simultaneous control of the contacts on the two sets of springs 3 to conduct, thereby realizing dual-path on / off control, through two sets of springs 3 and two conductors 10 that respectively cooperate with the two sets of springs 3.

[0031] Specifically, each set of reeds 3 consists of four reed units 15. One conductive unit connects the contacts on the four reed units 15. When the push rod 9 is in a free state, the contacts on the two sets of reeds 3 are connected through the conductors 10 on both sides. When an external force is applied to the push rod 9, the button 4 moves axially. When the button 4 moves synchronously with the conductors 10 to the specified stroke, the conductors 10 separate from the reed units 15, thus breaking the circuit. When the external force is released, the button 4 resets under the action of the spring return force inside the push rod 9, the conductors 10 resume contact with the reeds 3, and the contacts return to the normally closed state.

[0032] In some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a direct-pressure limit switch. The housing of the direct-pressure limit switch is provided with a spring seat cover 14 that partially accommodates the button 4. One end of the spring seat cover 14 is open, and the other end is fitted with a spring seat 13. The side wall of the spring seat cover 14 is provided with a vertically extending strip groove, and the inner wall of the spring seat cover 14 is provided with a through hole communicating with the strip groove. One end of the reed unit 15 is clamped and fixed between the spring seat cover 14 and the spring seat 13, and the other end extends into the strip groove, with its contacts entering the spring seat cover 14 through the through hole.

[0033] The direct-pressure limit switch of this application embodiment achieves elastic mounting of the reed unit 15 and precise contact positioning by setting the spring seat cover 14 and the spring seat 13 to cooperate with each other. When the button 4 is pressed, the reed unit 15 bends and deforms in the strip groove, and the contact contacts the conductor 10 through the through hole to complete the circuit switching.

[0034] Specifically, both the spring seat 13 and the spring seat cover 14 are made of insulating material. The spring seat 13 is fitted and fixed to the bottom of the spring seat cover 14 by an interference fit. The spring sheet 15 is fixed by the clamping force generated after the spring seat cover 14 and the spring seat 13 are installed. The free end extends along the strip groove, and the contact point enters the spring seat cover 14 through the through hole.

[0035] When button 4 is pressed, conductor 10 moves along the length of reed unit 15, forcing the contact at the free end to disengage from conductor 10, thus completing the circuit switching. The groove effectively limits the deformation direction of reed unit 15, ensuring the stability of contact.

[0036] In some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a direct-pressure limit switch. The spring unit 15 of the direct-pressure limit switch has a clamping end and a free end. The clamping end is Z-shaped and extends out of the spring seat 13 to form a pin. The free end is bent into a U-shaped protrusion, which passes through a through hole to form a contact.

[0037] The direct-pressure limit switch of this application embodiment enhances the clamping stability of the reed unit 15 and the elastic contact performance of the contacts by setting a Z-shaped clamping end and a U-shaped protrusion structure. The Z-shaped clamping end is fixed by the clamping force of the spring seat cover 14 and the spring seat 13, and the U-shaped protrusion can maintain elastic contact with the conductor 10 under the action of the reed unit 15, ensuring that the switch action is sensitive and reliable.

[0038] Specifically, the reed unit 15 is integrally bent from conductive material. The clamping end is fixed by the clamping force generated after the spring seat cover 14 and the spring seat 13 are installed. The Z-shaped structure can prevent the clamping end from coming out, forming a stable pin structure. The U-shaped protrusion at the free end is held at the through hole position under the action of the reed unit 15. When the button 4 is pressed, the U-shaped protrusion contacts the conductor 10, and the contact can be reliably connected and disconnected through the elastic deformation of the reed unit 15.

[0039] In some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a direct-pressure limit switch. The spring 6 of the direct-pressure limit switch is located inside the spring seat cover 14. The spring seat cover 14 is provided with a guide post 16. One end of the spring 6 is sleeved on the guide post 16, and the other end abuts against the button 4.

[0040] The direct-pressure limit switch of this application embodiment uses a coaxial limiting structure between the guide post 16 and the spring 6 to ensure that the spring 6 is subjected to uniform force when the button 4 is pressed, avoiding skewing that could cause jamming. The guide post 16 passes through the spring 6 and is fixed inside the spring seat cover 14. The button 4 moves along the axis of the guide post 16, thereby precisely controlling the conduction stroke of the contact.

[0041] Specifically, the guide post 16 is threadedly connected to the spring seat cover 14. The guide post 16 has an integrally formed annular flange that fits against the bottom wall of the inner cavity of the spring seat cover 14. The spring 6 is fitted on the guide post 16 and abuts against the button 4. The button 4 slides and matches the spring seat cover 14 to ensure that the button 4 moves along the axial direction of the guide post 16.

[0042] When button 4 is pressed, spring 6 is compressed along the axial direction of guide post 16, and button 4 drives conductor 10 to move towards spring unit 15; when resetting, spring 6 pushes button 4 to rebound, and the guiding effect of guide post 16 keeps the movement trajectory consistent, which can prevent deformation of spring unit 15 or poor contact of contact points caused by skewness.

[0043] In some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a direct-pressure limit switch. The housing of the direct-pressure limit switch includes an outer shell 1 that accommodates a spring seat cover 14 and a spring seat 13, and a base 2 connected to the outer shell 1. The base 2 is provided with a through hole 18 that slides and matches the button 4.

[0044] The direct-pressure limit switch in this embodiment facilitates component assembly and maintenance by using a separate housing 1 and base 2 mating structure. The button 4 slides through the through hole 18 in the base 2 to the housing 1, ensuring a stable movement trajectory for the button 4.

[0045] Specifically, the outer shell 1 and the base 2 are engaged to constrain the spring seat cover 14 and the spring seat 13 within the cavity formed by the outer shell 1 and the base 2. The button 4 is slidably engaged with the base 2 through the through hole 18, so that the circuit can be controlled by pressing the button 4 vertically.

[0046] In some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a direct-pressure limit switch. The button 4 of the direct-pressure limit switch includes a push rod 9 that slides and matches the through hole 18, and an insulating block 11 located inside the spring seat cover 14 and sleeved on the push rod 9. The conductor 10 is fixed on the insulating block 11. The push rod 9 is provided with a guide groove 21 for accommodating the spring 6 and the guide post 16.

[0047] The direct-pressure limit switch of this application embodiment achieves isolation protection of the conductor 10 by setting a combination structure of push rod 9 and insulating block 11. The guide groove 21 of push rod 9 can accommodate spring 6 and guide post 16, ensuring that the compression direction of spring 6 is consistent with the axis of guide post 16 when pressed. Insulating block 11 prevents short circuit between conductor 10 and metal parts, thus improving safety.

[0048] Specifically, the conductor 10 is a U-shaped conductive sheet, and the insulating block 11 has a U-shaped mounting groove that matches the U-shaped conductive sheet. The two ends of the conductor 10 are fixedly connected to the insulating block 11 by screws 12. The axis of the guide groove 21 on the push rod 9 coincides with the axis of the push rod 9. The diameter of the guide groove 21 is larger than the outer diameter of the spring 6. When the insulating block 11 moves down with the push rod 9, the guide groove 21 can accommodate the spring 6 and the guide post 16, thereby reducing the size of the housing in the length direction, achieving a compact layout, and ensuring the miniaturization of the limit switch.

[0049] In some alternative embodiments: see Figures 1 to 10 As shown, this application embodiment provides a direct-pressure limit switch. The end of the push rod 9 away from the insulating block 11 is provided with a threaded section 25 that matches the travel adjustment block 8. The push rod 9 is provided with a stop block 22 and a riveted edge 23 that respectively abut against the upper and lower end faces of the insulating block 11.

[0050] The direct-pressure limit switch of this application embodiment adjusts the axial position by setting a threaded section 25 in conjunction with the travel adjustment block 8, thereby achieving precise control of the travel range of the button 4; at the same time, the structure of the stop block 22 and the riveted edge 23 in cooperation prevents the insulating block 11 from falling off. The threaded section 25 and the travel adjustment block 8 are threadedly engaged to limit the displacement of the push rod 9, and the stop block 22 and the riveted edge 23 abut against each other to ensure that the insulating block 11 is fixed on the push rod 9 and does not move.

[0051] Specifically, the push rod 9 is integrally formed with a stop block 22 and a riveted edge 23. The push rod 9 is assembled with the insulating block 11 using the connection structure of the stop block 22 and the riveted edge 23. The stroke adjustment block 8 is connected to the threaded section 25. The maximum downward stroke of the push rod 9 can be changed by rotating the stroke adjustment block 8, so as to achieve full stroke adjustment and improve the mechanical structure adaptability of the product to external systems.

[0052] For example, the stroke adjustment block 8 can be designed in terms of height and shape according to the mechanical structure of the external system and the driving stroke, so as to realize the full-stroke adjustment of the limit switch. A typical stroke adjustment block 8 can be set as cylindrical, hemispherical, stepped, etc.

[0053] In some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a direct-pressure limit switch. The base 2 of the direct-pressure limit switch is provided with a guide sleeve 20 that cooperates with the push rod 9 and is used to stop the travel adjustment block 8. An annular groove 17 is provided in the guide sleeve 20, and a sealing ring 5 that slides in contact with the push rod 9 is provided in the annular groove 17.

[0054] The direct-pressure limit switch in this embodiment achieves bidirectional sealing and guidance of the pressing component by combining a guide sleeve 20 and a sealing ring 5. The sealing ring 5 fits against the surface of the push rod 9 to prevent external dust or liquid from entering. The base 2 and the guide sleeve 20 are integrally formed, and the guide sleeve 20 ensures that the push rod 9 moves linearly without deviation, thus extending its service life.

[0055] In some alternative embodiments: see Figures 1 to 8 As shown, this application embodiment provides a direct-pressure limit switch. The push rod 9 of the direct-pressure limit switch is provided with a radially extending pin hole 24, and the side wall of the guide sleeve 20 is provided with an insertion hole 19 for aligning the pin hole 24.

[0056] The direct-pressure limit switch of this application achieves mechanical locking between the push rod 9 and the guide sleeve 20 by setting a positioning structure with pin hole 24 and insertion hole 19. During installation, the pin passes through insertion hole 19 and pin hole 24 to prevent the push rod 9 from rotating or shifting, ensuring the stability and positioning accuracy of the pressing action.

[0057] Specifically, pin hole 24 is an oblong through hole, and insertion hole 19 is a circular through hole. When the push rod 9 is in the pressed state and the oblong through hole and the circular through hole overlap, a pin can be inserted into the oblong through hole and the circular through hole to lock the push rod 9 in the pressed state. In the pressed state, the circuit is disconnected. The locking and pressing state is easy and reliable, which can ensure the safety control requirements of the control system for the product.

[0058] In some alternative embodiments: see Figures 1 to 8As shown, this application embodiment provides a direct-pressure limit switch. The side wall of the housing 1 of the direct-pressure limit switch is provided with a connector socket 7 that is electrically connected to the pin. One end of the mounting base 2 of the housing 1 is provided with a flange 26 and a sealing ring mounting groove 27.

[0059] The direct-pressure limit switch of this embodiment improves the reliability of external circuit connections and overall sealing performance by setting a sealing structure between the connector socket 7 and the flange 26. The connector socket 7 is electrically connected to the pins of the spring unit 15, facilitating the connection of external connectors; the housing 1 and the connector socket 7 are fixedly connected by a back-mounted configuration, ensuring a simple switch structure; the flange 26 and the rubber ring installed in the sealing ring mounting groove 27 cooperate with each other, forming a double seal through fastener compression, which can adapt to harsh environments.

[0060] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0061] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A direct-pressure limit switch, characterized in that, include: The housing has at least one set of springs (3) inside, and the set of springs (3) includes at least two spring units (15) spaced apart, and each spring unit (15) is provided with a contact point; The pressing assembly includes a button (4) movably connected to the housing and extending to the side of the reed unit (15), and a spring (6) disposed in the housing and used to support the button (4). The pressing direction of the button (4) is consistent with the length direction of the reed unit (15). One end of the button (4) located inside the housing is provided with a conductor (10) for conducting the contact, and the other end located outside the housing is threadedly connected with a stroke adjustment block (8).

2. The direct-pressure limit switch as described in claim 1, characterized in that: The housing is provided with two sets of springs (3), which are symmetrically distributed on both sides of the button (4). There are two conductors (10) and they are used to connect the contacts on the two sets of springs (3) respectively.

3. The direct-pressure limit switch as described in claim 1 or 2, characterized in that: The housing is provided with a spring seat cover (14) that partially accommodates the button (4). One end of the spring seat cover (14) is open, and the other end is fitted with a spring seat (13). The side wall of the spring seat cover (14) is provided with a vertically extending strip groove, and the inner wall of the spring seat cover (14) is provided with a through hole communicating with the strip groove. One end of the reed unit (15) is clamped and fixed between the spring seat cover (14) and the spring seat (13), and the other end extends into the strip groove, with the contact point on it entering the spring seat cover (14) through the through hole.

4. The direct-pressure limit switch as described in claim 3, characterized in that: The reed unit (15) has a clamping end and a free end. The clamping end is Z-shaped and extends out of the spring seat (13) to form a pin. The free end is bent into a U-shaped protrusion, which passes through the through hole to form the contact point.

5. The direct-pressure limit switch as described in claim 4, characterized in that: The spring (6) is located inside the spring seat cover (14), and a guide post (16) is provided inside the spring seat cover (14). One end of the spring (6) is sleeved on the guide post (16), and the other end abuts against the button (4).

6. The direct-pressure limit switch as described in claim 4, characterized in that: The housing includes an outer shell (1) that houses the spring seat cover (14) and the spring seat (13), and a base (2) connected to the outer shell (1), wherein the base (2) is provided with a through hole (18) that slides to match the button (4). The side wall of the housing (1) is provided with a connector socket (7) that is electrically connected to the pin, and the end of the housing (1) where the base (2) is mounted is provided with a flange (26) and a sealing ring mounting groove (27).

7. The direct-pressure limit switch as described in claim 6, characterized in that: The button (4) includes a push rod (9) that slides and matches the through hole (18), and an insulating block (11) located inside the spring seat cover (14) and sleeved on the push rod (9). The conductor (10) is fixed on the insulating block (11). The push rod (9) is provided with a guide groove (21) for accommodating the spring (6) and the guide post (16).

8. The direct-pressure limit switch as described in claim 7, characterized in that: The top rod (9) is provided with a threaded section (25) of a matching stroke adjustment block (8) at one end away from the insulating block (11). The top rod (9) is provided with a stop block (22) and a riveted edge (23) that abut against the upper and lower end faces of the insulating block (11) respectively.

9. The direct-pressure limit switch as described in claim 7, characterized in that: The base (2) is provided with a guide sleeve (20) that cooperates with the top rod (9) and is used to stop the stroke adjustment block (8). The guide sleeve (20) is provided with an annular groove (17), and the annular groove (17) is provided with a sealing ring (5) that slides in contact with the top rod (9).

10. The direct-pressure limit switch as described in claim 9, characterized in that: The top rod (9) is provided with a radially extending pin hole (24), and the side wall of the guide sleeve (20) is provided with an insertion hole (19) for aligning the pin hole (24).

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