A travel mechanical limit switch for a hydraulic hoist

Abstract

The present invention discloses a travel mechanical limit switch for a hydraulic hoist. The travel switch may include a pair of limit switches which are arranged at intervals. One end of the actuating mechanism can move between the pair of limit switches, and when one end of the actuating mechanism moves to the position of the limit switch, it can trigger the limit switch. The follow-up mechanism is respectively connected to the piston rod of the hydraulic hoist and the actuating mechanism. The follow-up mechanism can move along with the piston rod and trigger the actuating mechanism to move. Through the follow-up mechanism of the present invention, the actuating mechanism can be driven to move. When the piston rod of the hydraulic hoist moves outside the preset range, the actuating mechanism will touch the limit switch, and the limit switch sends a signal to the electrical control device that controls the movement of the piston rod of the hydraulic hoist, thereby performing travel limit on the piston rod of the hydraulic hoist. Moreover, because the structure of this device is simple and it occupies little space, it can be more conveniently installed on the external support, thereby realizing concealed layout and reducing the impact on the surrounding landscape.

Description

Technical Field

[0001] The present invention belongs to the field of hydraulic hoisting equipment, and more specifically, relates to a mechanical limit switch for the stroke of a hydraulic hoist. Background Art

[0002] Travel switches are widely used in the control of various mechanical structures and are also a device that must be installed in the hydraulic hoists of water conservancy projects. For the travel switches used in the hydraulic hoist industry, they are required to have high precision, reliable operation, and a harsh working environment. Currently, the known travel switches for inverted hydraulic cylinders mainly include wire-pulling type or tape-pulling type, bumper rod type, etc. However, due to their principles or their own structural forms, the service life of the travel switch device is short and the repeat accuracy is poor. Summary of the Invention

[0003] The object of the present invention is to provide a mechanical limit switch for the stroke of a hydraulic hoist, which has higher reliability during operation, a reasonable structure, can be concealedly arranged, and has strong coordination with the surrounding landscape.

[0004] To achieve the above object, the present invention provides a mechanical limit switch for the stroke of a hydraulic hoist, including:

[0005] A pair of limit switches, which are arranged at intervals;

[0006] A triggering mechanism, one end of which can move between the pair of limit switches, and when the one end of the triggering mechanism moves to the limit switch, it can trigger the limit switch;

[0007] A follower mechanism, which is fixedly connected to the piston rod of the hydraulic hoist and is slidably connected to the triggering mechanism. The follower mechanism can move along with the piston rod and trigger the movement of the triggering mechanism.

[0008] Optionally, the triggering mechanism includes a bumper rod and a bumper plate. The bumper plate is connected to one end of the bumper rod, and the bumper plate can move between the pair of limit switches to trigger the limit switch.

[0009] Optionally, it further includes a bracket, and the pair of limit switches are arranged on the bracket.

[0010] Optionally, it further includes a reset mechanism, which is arranged on the bracket and is connected to the bumper rod.

[0011] Optionally, the reset mechanism includes a tube body and a spring located inside the tube body. The tube body is connected to the bracket, and both the tube body and the spring are sleeved on the bumper rod. One end of the spring is connected to the bumper rod, and the other end of the spring is connected to the tube body.

[0012] Optionally, the follower mechanism includes a connecting rod, a hoop and an annular plate. The hoop is connected to the piston rod of the hydraulic hoist. One end of the connecting rod is connected to the hoop, and the other end of the connecting rod is an annular plate sleeved on the striking rod and capable of sliding relative to the striking rod.

[0013] Optionally, a pair of limit retaining rings are provided on the striking rod, and the annular plate of the follower mechanism can move between the pair of limit retaining rings.

[0014] Optionally, the inner diameter of the annular ring of the connecting rod is greater than the outer diameter of the striking rod, and the inner diameter of the annular ring of the connecting rod is less than the outer diameter of the limit retaining ring.

[0015] Optionally, a protective sleeve is further included. One end of the protective sleeve is connected to the annular plate of the follower mechanism, and the protective sleeve is sleeved on the striking rod.

[0016] Optionally, the inner diameter of the protective sleeve is greater than the outer diameter of the limit retaining ring.

[0017] The beneficial effects of the present invention are as follows: The follower mechanism can drive the actuating mechanism to move. Since the follower mechanism moves along with the piston rod of the hydraulic hoist, the actuating mechanism can feedback the moving state of the piston rod of the hydraulic hoist when it is close to the limit position. When the piston rod of the hydraulic hoist moves to near the limit position, the actuating mechanism will touch the limit switch, and the limit switch sends a signal to the device that controls the operation of the piston rod of the hydraulic hoist, thereby performing stroke limit on the piston rod of the hydraulic hoist. And because the structure of this device is simple and occupies little space, it can be more conveniently installed on the external support, so as to achieve concealed layout and reduce the impact on the surrounding landscape.

[0018] Other features and advantages of the present invention will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By describing the exemplary embodiments of the present invention in more detail in conjunction with the drawings, the above and other objects, features and advantages of the present invention will become more obvious. Among them, in the exemplary embodiments of the present invention, the same reference numerals generally represent the same components.

[0020] Figure 1 FIG. shows a schematic structural diagram of a mechanical limit switch for the stroke of a hydraulic hoist according to an embodiment of the present invention.

[0021] Figure 2 FIG. shows a schematic side view of the structure of a mechanical limit switch for the stroke of a hydraulic hoist according to an embodiment of the present invention.

[0022] Figure 3Shows a schematic structural diagram when the upper limit switch of a hydraulic hoist stroke mechanical limit switch according to an embodiment of the present invention is triggered.

[0023] Figure 4 Shows a schematic structural diagram when the lower limit switch of a hydraulic hoist stroke mechanical limit switch according to an embodiment of the present invention is triggered.

[0024] Figure 5 Shows Figure 1 The cross-sectional view at A-A in

[0025] In the figure: 1 - limit switch, 2 - striker, 3 - striker plate, 4 - bracket, 5 - pipe body, 6 - spring, 7 - connecting rod, 8 - circular ring plate, 9 - limit retaining ring, 10 - protective sleeve, 11 - piston rod of the hydraulic hoist, 12 - hoop. Specific embodiments

[0026] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0027] A hydraulic hoist stroke mechanical limit switch includes

[0028] A pair of limit switches, which are arranged at intervals;

[0029] A triggering mechanism, one end of which can move between the pair of limit switches, and when one end of the triggering mechanism moves to the limit switch, it can trigger the limit switch;

[0030] A follow-up mechanism, which is respectively connected to the piston rod of the hydraulic hoist and the triggering mechanism, and the follow-up mechanism can move following the piston rod and trigger the movement of the triggering mechanism.

[0031] The triggering mechanism can be driven to move through the follow-up mechanism. Since the follow-up mechanism moves following the piston rod of the hydraulic hoist, the movement of the piston rod of the hydraulic hoist is fed back when the triggering mechanism approaches the limit position. When the piston rod of the hydraulic hoist approaches the limit position, the triggering mechanism will touch the limit switch, and the limit switch sends a signal to the device that controls the operation of the piston rod of the hydraulic hoist, thereby performing stroke limit on the piston rod of the hydraulic hoist. And because the structure of this device is simple and occupies little space, it can be more conveniently installed on the external support, so as to achieve concealed layout and reduce the impact on the surrounding landscape.

[0032] Figure 1Shows a schematic structural diagram of a hydraulic hoist stroke mechanical limit switch according to an embodiment of the present invention, Figure 2 Shows a schematic side view of a hydraulic hoist stroke mechanical limit switch according to an embodiment of the present invention, Figure 3 Shows a schematic structural diagram of a hydraulic hoist stroke mechanical limit switch when the upper limit switch is triggered according to an embodiment of the present invention, Figure 4 Shows a schematic structural diagram of a hydraulic hoist stroke mechanical limit switch when the lower limit switch is triggered according to an embodiment of the present invention, Figure 5 Shows Figure 1 The cross-sectional view at A-A in

[0033] Embodiment

[0034] A hydraulic hoist stroke mechanical limit switch includes,

[0035] A pair of limit switches 1, the pair of limit switches 1 are arranged at intervals;

[0036] A triggering mechanism, one end of the triggering mechanism can move between the pair of limit switches 1, and when one end of the triggering mechanism moves to the limit switch 1, it can trigger the limit switch 1;

[0037] A follow-up mechanism, the follow-up mechanism is respectively connected to the piston rod 11 of the hydraulic hoist, the triggering mechanism penetrates through the follow-up mechanism, and the follow-up mechanism can move along with the piston rod and trigger the movement of the triggering mechanism under certain conditions.

[0038] Specifically, the triggering mechanism includes a striker 2 and a striker plate 3, the striker plate 3 is connected to one end of the striker 2, and the striker plate 3 can move between the pair of limit switches 1 to trigger the limit switch 1. The limit switch 1 can be touched without affecting the movement of the striker 2, and because the striker plate 3 is installed on the striker 2, it can move along with the striker 2, thereby reflecting the movement state when the piston rod 11 of the hydraulic hoist reaches the upper and lower limit positions.

[0039] Specifically, a hydraulic hoist stroke mechanical limit switch further includes a bracket 4, the pair of limit switches 1 are arranged on the bracket 4, the bracket 4 provides an installation position for the limit switch 1, and by connecting the bracket 4 to an external support structure, the device can be more conveniently concealed.

[0040] Specifically, a hydraulic hoist stroke mechanical limit switch further includes a reset mechanism, the reset mechanism is arranged on the bracket 4, and the striker 2 penetrates through the reset mechanism. When the piston rod 11 of the hydraulic hoist returns from the upper limit or the lower limit to the middle stroke position, the striker 2 can be restored to its original position by its own gravity and the reset device, waiting for the next triggering action.

[0041] Specifically, the reset mechanism includes a tube body 5 and a spring 6 located inside the tube body 5. The tube body 5 is connected to the bracket 4, and the striker 2 passes through the tube body 5 and the spring 6. One end of the spring 6 is in contact connection with the striker 2, and the other end of the spring 6 is in contact connection with the tube body 5. When the striker 2 moves, it drives the spring 6 to move. When the piston rod 11 of the hydraulic hoist is in the working stroke position, the striker 2 returns to its original position under the action of the spring 6 or its own gravity, waiting for the next trigger action.

[0042] Specifically, the follower mechanism includes a connecting rod 7 and a circular ring plate 8. One end of the connecting rod 7 is connected to the hoop 12, the hoop 12 is connected to the piston rod 11 of the hydraulic hoist, the other end of the connecting rod 7 is connected to the circular ring plate 8, and the striker 2 passes through the circular ring plate 8. The circular ring plate 8 can move relative to the striker 2 when it is not in the extreme position.

[0043] Specifically, a pair of limit retaining rings 9 are provided on the striker 2. When it is not in the extreme position, the circular ring plate 8 can move between the pair of limit retaining rings 9. When the circular ring plate 8 slides to the upper limit retaining ring 9, the circular ring plate 8 drives the striker 2 to move upward. When the circular ring plate 8 moves to the lower limit retaining ring 9, the hoop 8 drives the striker 2 to move downward; when the circular ring plate 8 does not touch the limit retaining ring 9, the striker 2 can remain in place; when the circular ring plate 8 touches the limit retaining ring 9, a small amount of movement can be given to the striker 2 through the circular ring plate 8, reducing the installation distance between the two-position limit switches 1, making it easier to arrange, install and conceal the limit switches 1.

[0044] Specifically, the inner diameter of the circular ring plate 8 is larger than the outer diameter of the striker 2, and the inner diameter of the circular ring plate 8 is smaller than the outer diameter of the limit retaining ring 9. The inner diameter of the circular ring plate 8 being larger than the outer diameter of the striker 2 allows the circular ring plate 8 to move freely relative to the striker 2 when it is not in the extreme position, and the inner diameter of the circular ring plate 8 being smaller than the outer diameter of the limit retaining ring 9 allows the circular ring plate 8 to drive the limit retaining ring 9 to move when it is in the extreme position.

[0045] Specifically, a hydraulic hoist stroke mechanical limit switch further includes a protective sleeve 10. One end of the protective sleeve 10 is connected to the circular ring plate 8, and the striker 2 passes through the protective sleeve 10. The striker 2 can be protected through the protective sleeve 10.

[0046] Specifically, the inner diameter of the protective sleeve 10 is larger than the outer diameter of the limit retaining ring 9.

[0047] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments.

Claims

1. A travel mechanical limit switch for a hydraulic hoist, characterized in that, Comprising: A pair of limit switches, which are arranged at intervals. A triggering mechanism, one end of which can move between the pair of limit switches, and when the said one end of the triggering mechanism moves to the limit switch, it can trigger the limit switch. A follow-up mechanism, which is fixedly connected to the piston rod of the hydraulic hoist and is slidably connected to the triggering mechanism. The follow-up mechanism can move following the piston rod and trigger the movement of the triggering mechanism. The triggering mechanism includes a striker rod and a striker plate. The striker plate is connected to one end of the striker rod, and the striker plate can move between the pair of limit switches to trigger the limit switch. It further includes a bracket, and the pair of limit switches are arranged on the bracket. It further includes a reset mechanism, which is arranged on the bracket and is connected to the striker rod. The reset mechanism includes a pipe body and a spring located inside the pipe body. The pipe body is connected to the bracket, and both the pipe body and the spring are sleeved on the striker rod. One end of the spring is in contact connection with the striker rod, and the other end of the spring is in contact connection with the pipe body. The follow-up mechanism includes a connecting rod, a hoop and a circular ring plate. The hoop is connected to the piston rod of the hydraulic hoist. One end of the connecting rod is connected to the hoop, and the other end of the connecting rod is connected to the circular ring plate. The circular ring plate is sleeved on the striker rod and can move relative to the striker rod. A pair of limit retaining rings are arranged on the striker rod. The circular ring plate can move between the pair of limit retaining rings. When the circular ring plate approaches the limit position, it drives the limit retaining rings to trigger the action of the travel switch.

2. The travel mechanical limit switch of the hydraulic hoist according to claim 1, characterized in that The inner diameter of the circular ring plate is larger than the outer diameter of the striker rod, and the inner diameter of the circular ring plate is smaller than the outer diameter of the limit retaining ring.

3. The travel mechanical limit switch of the hydraulic hoist according to claim 2, characterized in that, It further includes a protective sleeve. One end of the protective sleeve is connected to the circular ring plate, and the striker rod passes through the protective sleeve.

4. The travel mechanical limit switch of the hydraulic hoist according to claim 3, characterized in that, The inner diameter of the protective sleeve is larger than the outer diameter of the limit retaining ring.

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