A pilot cutout switch

Abstract

The utility model relates to a hydraulic system control switch technical field, especially a kind of pilot cut-off switch, rotating shaft one end passes through shaft seat, rotating damper and rotating shaft use keyway connection to be circumferentially fixed, rotating shaft one end is connected with pilot cut-off rod, the other end is connected with tension spring, by the pilot cut-off rod of front and back and drive to make rotating shaft rotate to open and close pilot valve, the other end of rotating shaft is connected with tension spring, through specific angle arrangement, provide power assistance in the rear half course of the rotation of shaft two directions, and provide stable locking force after reaching limit, ensure that not because equipment vibration leads to switch state change.In the process of rotation, under the tension of tension spring, the rotating speed of rotating shaft is constantly improved, at this time, rotating damper will provide reverse rotating torque according to the rotating speed of rotor, avoid the rotating speed of rotating shaft too fast and occur violent collision and vibration at limit point.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system control switch technology, and in particular to a pilot cut-off switch. Background Technology

[0002] Pilot-operated shut-off switches are commonly used in construction machinery to control whether various actions can be performed. The pilot valve is generally controlled by manually operating the pilot shut-off lever.

[0003] In existing pilot-operated shut-off switches, the pilot shut-off rod is fixedly connected to the rotating shaft and rotates to control the opening and closing of the pilot valve. A rotating shaft with one end passing through the center of the shaft seat is also provided to ensure smooth rotation. The shaft seat is fixed to the armrest box bracket and limits the rotation angle of the rotating shaft through its own flange. The other end of the rotating shaft is connected to a tension spring. Through a specific angle arrangement, it provides assistance in the latter half of the rotation of the rotating shaft in both directions and provides a stable locking force after reaching the limit. However, the pilot-operated shut-off switch with the above structure will cause the rotating shaft to quickly rebound to the end limit point due to the elasticity or inertia of the tension spring, resulting in vibration and noise in the pilot-operated shut-off switch, which has room for optimization.

[0004] To address the aforementioned problems, this utility model proposes a pilot cut-off switch. Utility Model Content

[0005] The utility model of this invention is to provide a pilot cut-off switch, which aims to solve the problem that the rotating shaft of the existing pilot cut-off switch quickly rebounds to the end limit point due to the elastic force or inertia of the tension spring, resulting in obvious vibration and noise.

[0006] This utility model proposes a pilot-operated cut-off switch, comprising:

[0007] support;

[0008] A rotating shaft is mounted on the bracket via a bearing seat; the rotating shaft is an eccentric shaft.

[0009] A buffer component is disposed on the rotating shaft, and the buffer component is configured to apply resistance to the rotational motion of the rotating shaft;

[0010] The elastic component is fixedly connected at one end to the bracket and at the other end to one end of the rotating shaft; the elastic component stretches when the rotating shaft rotates, giving the rotating shaft a tendency to return to its initial position;

[0011] A pilot cut-off rod is connected to the other end of the rotating shaft to control the rotation of the rotating shaft.

[0012] Furthermore, the buffer component includes:

[0013] A rotary damper, wherein an internal rotor is sleeved on the rotating shaft and rotates synchronously with the rotating shaft, and its outer shell is fixed relative to the bracket.

[0014] Furthermore, it also includes:

[0015] A damper mounting plate is mounted on the bracket and sleeved on the rotating shaft; the end face of the damper mounting plate away from the shaft seat is used to fix the outer shell of the rotary damper.

[0016] Furthermore, it also includes:

[0017] External fasteners;

[0018] The bracket has a protrusion forming a fixing member, and the fixing member has two first limiting holes arranged side by side;

[0019] The bearing seat and the damper mounting plate are respectively provided with a second limiting hole and a third limiting hole; the bearing seat and the damper mounting plate are arranged side by side, and the second limiting hole and the third limiting hole are respectively coaxially aligned with the two first limiting holes; the external fastener is inserted into the coaxially aligned first limiting hole and the second limiting hole to fix the bearing seat and the bracket, and the external fastener is inserted into the coaxially aligned first limiting hole and the third limiting hole to fix the damper mounting plate and the bracket.

[0020] Furthermore, the elastic component includes a tension spring;

[0021] The inner protrusion of the bracket forms a buckle for fixing one end of the tension spring;

[0022] The other end of the tension spring is fixed to the end of the rotating shaft away from the pilot cut-off rod.

[0023] Furthermore, in the static state, the two ends of the tension spring are located on the same vertical line;

[0024] Under the control of the pilot cutting rod, the end of the tension spring connected to the rotating shaft gradually moves away from the fixed end of the tension spring.

[0025] Furthermore, a limiting member is formed on the end face of the bearing seat away from the pilot cutting rod, and the limiting member is located on the rotation path of the rotating shaft on the same side.

[0026] Furthermore, the rotating shaft includes a first rotating shaft and a second rotating shaft fixedly disposed on both ends of the intermediate block, and the axes of the first rotating shaft and the second rotating shaft are offset.

[0027] The bearing seat and the buffer component are sleeved on the outside of the first rotating shaft, and the end of the first rotating shaft is connected to the pilot cut-off rod.

[0028] Furthermore, the buffer component is configured to apply a nonlinear resistance torque to the rotational motion of the rotating shaft.

[0029] Furthermore, the magnitude of the nonlinear resistance torque applied by the buffer component to the rotating shaft is positively correlated with the rotational speed of the rotating shaft.

[0030] As can be seen from the above, the following beneficial effects can be obtained by applying the technical solution provided by this utility model:

[0031] First, the pilot cut-off switch proposed in this utility model is equipped with a buffer component, which can effectively reduce the speed and force of the rotating shaft rotation, extend the rebound time of the rotating shaft, reduce the rebound impact intensity, suppress vibration, and extend the fatigue life of the rotating shaft.

[0032] Secondly, the pilot cut-off switch proposed in this utility model only adds a small rotary damper as a buffer component, without significantly altering the existing structure. It can be directly processed and installed on the existing structure, making the modification difficult and costly, and it is compatible with various switch models.

[0033] Third, the pilot cut-off switch proposed in this utility model uses an eccentric rotating shaft design to gradually increase the tension of the spring as the rotation angle increases, and the rotation angle of the rotating shaft is effectively controlled by the setting of the limiting component, thereby easily realizing the rotation angle control of the pilot cut-off switch. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is an exploded view of the pilot cut-off switch in an embodiment of this utility model;

[0036] Figure 2 This is a schematic diagram of the pilot cut-off switch in an embodiment of the present invention;

[0037] Figure 3 This is a partial structural schematic diagram of the pilot cut-off switch in an embodiment of this utility model. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0039] The existing pilot cut-off switch has a rotating shaft that quickly rebounds to the end limit point due to the elasticity or inertia of the tension spring, causing significant vibration and noise, which affects the user experience and fatigue life of the product.

[0040] like Figures 1-3 As shown, to solve the above problems, this embodiment proposes a pilot cut-off switch, including a bracket 10, a rotating shaft 20, a buffer component, a spring component, and a pilot cut-off rod 30; the rotating shaft 20 is mounted on the bracket 10 through a shaft seat 50; the rotating shaft 20 is an eccentric shaft; the buffer component is disposed on the rotating shaft 20, and the buffer component is configured to apply resistance to the rotational movement of the rotating shaft; one end of the spring component is fixedly connected to the bracket 10, and the other end is connected to one end of the rotating shaft 20; the spring component stretches when the rotating shaft 20 rotates, causing the rotating shaft 20 to tend to return to its initial position; the pilot cut-off rod 30 is connected to the other end of the rotating shaft 20 to control the rotation of the rotating shaft 20.

[0041] Preferably, in this embodiment, the bracket 10 is frame-shaped, mainly matching the shape of the external structural components. Preferably, but not limited to, in this embodiment, the length of the rotating shaft 20 is greater than the width of the bracket 10, that is, one end of the rotating shaft 20 protrudes from the bracket 10 and is connected to the external pilot cut-off rod 30.

[0042] Preferably, in this embodiment, the rotating shaft 20 includes a first rotating shaft 21 and a second rotating shaft 22 fixedly disposed on the symmetrical end face of the intermediate block, and the axes of the first rotating shaft 21 and the second rotating shaft 22 are offset; the shaft seat 50 and the buffer component are sleeved on the outside of the first rotating shaft 21, and the end of the first rotating shaft 21 is connected to the pilot cutting rod 30.

[0043] Preferably, in this embodiment, the buffer component is configured to apply a nonlinear resistance torque to the rotational motion of the rotating shaft 20. Not limited to this, the magnitude of the nonlinear resistance torque applied by the buffer component to the rotating shaft 20 is positively correlated with the rotational speed of the rotating shaft 20.

[0044] In this embodiment, by setting a buffer component, the speed and intensity of the rebound of the rotating shaft 20 under the action of the elastic component can be effectively reduced, the rebound time and life of the rotating shaft 20 can be extended, hard contact can be eliminated, and the existing pilot cut-off switch structure can be retained, making it compatible with various switch models.

[0045] More specifically, the buffer component includes a rotary damper 40; the internal rotor of the rotary damper 40 is sleeved on the rotating shaft 20 and rotates synchronously with the rotating shaft 20, and the outer shell of the rotary damper 40 is fixed relative to the bracket 10.

[0046] Preferably, in this embodiment, the rotor of the rotary damper 40 and the rotating shaft 20 are connected by a keyway to achieve synchronous rotation of the rotor of the rotary damper 40 and the rotating shaft 20.

[0047] Preferably, in this embodiment, the damping medium of the rotary damper 40 is selected from one or more of Newtonian fluid, magnetorheological material, or piezoelectric polymer.

[0048] In this embodiment, the rotation damper 40 is provided during the rotation of the rotating shaft 20 to provide reverse resistance according to the rotation speed, counteract the rotation energy, and prevent the rotation speed from being too fast.

[0049] More specifically, it also includes a damper mounting plate 60 mounted on the bracket 10, and the damper mounting plate 60 is sleeved on the rotating shaft 20; the end face of the damper mounting plate 60 away from the shaft seat 50 is used to fix the housing of the rotating damper 40.

[0050] Preferably, in this embodiment, the outer shell of the rotary damper 40 is mounted on the damper mounting plate 60 and coupled to the motion path of the rotary shaft 20, while the rotor inside the rotary damper 40 is meshed with the rotary shaft 20.

[0051] Preferably, in this embodiment, the end face of the damper mounting plate 60 facing the rotary damper 40 is a plane, and the end face of the rotary damper 40 that abuts against the damper mounting plate 60 is also a plane.

[0052] Preferably, in this embodiment, the damper mounting plate 60 and the bearing seat 50 are coaxially aligned, that is, the damper mounting plate 60 fully covers the bearing seat 50 along the length of the rotation axis 20, ensuring the fixed connection between the bearing seat 50 and the damper mounting plate 60.

[0053] In this embodiment, the setting position of the rotary damper 40 is defined by the setting of the damper mounting plate 60, and the meshing relationship between the rotor on the rotary damper 40 and the rotating shaft 20 is ensured, so that the rotary damper 40 provides reverse torque during the rotation of the rotating shaft 20.

[0054] More specifically, it also includes an external fastener 70; a fixing member 11 is protruding on the bracket 10, and the fixing member 11 has two first limiting holes arranged side by side; the bearing seat 50 and the damper mounting plate 60 are respectively provided with a second limiting hole and a third limiting hole; the bearing seat 50 and the damper mounting plate 60 are arranged side by side, and the second limiting hole and the third limiting hole are respectively coaxially aligned with the two first limiting holes. The external fastener 70 is inserted into the coaxially aligned first limiting hole and the second limiting hole to fix the bearing seat 50 and the bracket 10, and the external fastener 70 is inserted into the coaxially aligned first limiting hole and the third limiting hole to fix the damper mounting plate 60 and the bracket 10.

[0055] Preferably, in this embodiment, the bearing seat 50 is provided with a second limiting hole and a third limiting hole. The third limiting hole on the bearing seat 50 and the third limiting hole on the damper mounting plate 60 are coaxially aligned when the damper mounting plate 60 is stacked on the bearing seat 50, so that the external fasteners 70 can be inserted and fixed.

[0056] Preferably, in this embodiment, the diameters of the first limiting hole, the second limiting hole, and the third limiting hole are equal. Preferably, but not limited to, in this embodiment, the diameters of the first limiting hole, the second limiting hole, and the third limiting hole are equal to the outer diameter of the end of the external fastener 70.

[0057] Preferably, in this embodiment, the second limiting hole and the third limiting hole are provided with internal threads, and the external fastener 70 is provided with external threads to achieve threaded connection.

[0058] Preferably, in this embodiment, the external fastener 70 is arranged in a direction perpendicular to the rotation axis 20 to ensure the convenience of the assembly process.

[0059] In this embodiment, the positional relationship between the shaft seat 50 and the damper mounting plate 60 and the bracket 10 is ensured by the insertion and fixing of the external fastener 70, thereby ensuring the setting position of the rotating shaft 20 on the bracket 10, and the eccentric rotation within a limited range during the rotation of the rotating shaft 20, that is, ensuring the normal operation of the pilot cut-off switch.

[0060] More specifically, the elastic component includes a tension spring 80; the inner protrusion of the bracket 10 forms a retaining ring 12 for fixing one end of the tension spring 80; the other end of the tension spring 80 is fixed to the end of the rotating shaft 20 away from the pilot cut-off rod 30.

[0061] Preferably, in the static state, the two ends of the tension spring 80 are located on the same vertical line; under the control of the pilot cut-off rod 30, the end of the tension spring 80 connected to the rotating shaft 20 gradually moves away from the fixed end of the tension spring 80, and the end of the tension spring 80 connected to the rotating shaft 20 forms an arc motion trajectory.

[0062] In this embodiment, due to the eccentric shaft structure of the rotating shaft 20, the end of the second rotating shaft 22 connected to the tension spring 80 will move away from the fixed end of the tension spring 80. Therefore, the tension spring 80 is stretched under the movement of the second rotating shaft 22, forming an elastic force that pulls the rotating shaft 20 back to its initial position.

[0063] More specifically, a limiting element is formed on the end face of the bearing seat 50 away from the pilot cut-off rod 30, and the limiting element is located on the rotation path of the rotating shaft 20 on the same side.

[0064] Preferably, in this embodiment, the limiting member protrusion is provided on the edge of the bearing seat 50 to form a flange structure on the bearing seat 50.

[0065] Preferably, in this embodiment, the limiting member is disposed on the rotation path of the second rotating shaft 22. When its two end faces abut against the second rotating shaft 22, the second rotating shaft 22 is in a stationary state and the second rotating shaft 22 is in a maximum rotation state, respectively. Therefore, the limiting member is used to limit the rotation range of the second rotating shaft 22, that is, to limit the swing range of the pilot cutting rod 30.

[0066] In summary, this embodiment proposes a pilot-operated shut-off switch. The shaft seat 50 and damper mounting plate 60 are mounted on the bracket 10 using external fasteners 70. One end of the rotating shaft 20 passes through the shaft seat 50. The rotating damper 40 is fixed to the damper mounting plate 60 and circumferentially fixed to the rotating shaft 20 via a keyway connection. One end of the rotating shaft 20 is fixedly connected to the pilot shut-off rod 30, and the other end is connected to the tension spring 80. Rotating the rotating shaft 20 by moving the pilot shut-off rod 30 back and forth opens and closes the pilot valve. The flange portion at the other end of the shaft seat 50 ensures rotational limitation. The other end of the rotating shaft 20 is connected to the tension spring 80. Through a specific angular arrangement, it provides assistance during the latter half of the rotation in both directions and provides a stable locking force after reaching the limit, ensuring that the switch state does not change due to equipment vibration. During rotation, the rotational speed of the rotating shaft 20 continuously increases due to the tension of the tension spring 80. At this time, the rotating damper 40 will provide a reverse rotational torque according to the rotational speed of the rotor to prevent the rotating shaft 20 from rotating too fast and from causing violent collisions and vibrations at the limit point.

[0067] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A pilot-operated cut-off switch, characterized in that, include: support; A rotating shaft is mounted on the bracket via a bearing seat; the rotating shaft is an eccentric shaft. A buffer component is disposed on the rotating shaft, and the buffer component is configured to apply resistance to the rotational motion of the rotating shaft; The elastic component is fixedly connected at one end to the bracket and at the other end to one end of the rotating shaft; the elastic component stretches when the rotating shaft rotates, giving the rotating shaft a tendency to return to its initial position; A pilot cut-off rod is connected to the other end of the rotating shaft to control the rotation of the rotating shaft.

2. The pilot-operated disconnect switch according to claim 1, characterized in that, The buffer component includes: A rotary damper, wherein an internal rotor is sleeved on the rotating shaft and rotates synchronously with the rotating shaft, and its outer shell is fixed relative to the bracket.

3. A pilot-operated disconnect switch according to claim 2, characterized in that, Also includes: A damper mounting plate is mounted on the bracket and sleeved on the rotating shaft; the end face of the damper mounting plate away from the shaft seat is used to fix the outer shell of the rotary damper.

4. A pilot-operated disconnect switch according to claim 3, characterized in that, Also includes: External fasteners; The bracket has a protrusion forming a fixing member, and the fixing member has two first limiting holes arranged side by side; The bearing seat and the damper mounting plate are respectively provided with a second limiting hole and a third limiting hole; the bearing seat and the damper mounting plate are arranged side by side, and the second limiting hole and the third limiting hole are respectively coaxially aligned with the two first limiting holes; the external fastener is inserted into the coaxially aligned first limiting hole and the second limiting hole to fix the bearing seat and the bracket, and the external fastener is inserted into the coaxially aligned first limiting hole and the third limiting hole to fix the damper mounting plate and the bracket.

5. A pilot-operated disconnect switch according to any one of claims 1 to 4, characterized in that: The elastic component includes a tension spring; The inner protrusion of the bracket forms a buckle for fixing one end of the tension spring; The other end of the tension spring is fixed to the end of the rotating shaft away from the pilot cut-off rod.

6. A pilot-operated disconnect switch according to claim 5, characterized in that: In a stationary state, the two ends of the tension spring are located on the same vertical line; Under the control of the pilot cutting rod, the end of the tension spring connected to the rotating shaft gradually moves away from the fixed end of the tension spring.

7. A pilot-operated disconnect switch according to claim 6, characterized in that: The end face of the bearing seat away from the pilot cut-off rod forms a limiting member, and the limiting member is located on the rotation path of the rotating shaft on the same side.

8. A pilot-operated disconnect switch according to any one of claims 1 to 4, characterized in that: The rotating shaft includes a first rotating shaft and a second rotating shaft fixedly disposed on both ends of the middle block, and the axes of the first rotating shaft and the second rotating shaft are offset. The bearing seat and the buffer component are sleeved on the outside of the first rotating shaft, and the end of the first rotating shaft is connected to the pilot cut-off rod.

9. A pilot-operated cut-off switch according to claim 8, characterized in that: The buffer component is configured to apply a nonlinear resistance torque to the rotational motion of the rotating shaft.

10. A pilot-operated cut-off switch according to claim 9, characterized in that: The magnitude of the nonlinear resistance torque applied by the buffer component to the rotating shaft is positively correlated with the rotational speed of the rotating shaft.

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