A hydraulic switch device for a hydraulic motor of a coal mine traction anchor rod cable

Abstract

The utility model discloses a hydraulic switch device for coal mine traction anchor rod anchor cable hydraulic motor relates to anchor rod, anchor cable drawing traction technical field. The utility model discloses a valve body, valve core, guide wheel and traction rope, and the front end and the tail end in the valve body are equipped with front chamber and rear chamber respectively, and the front chamber and the rear chamber intercommunication and the connecting place form the step surface. The utility model discloses a novel hydraulic switch through the pre -tightening force of spring determination traction force threshold, can realize the traction of traction rope, guide wheel displacement, valve core axial displacement to hydraulic oil circuit switching control after overload, no electric control link, realizes hydraulic control through pure mechanical structure, has improved response time, has reduced the cost, does not need external power, and can cut off hydraulic motor power and stop working completely, and also can active pressure -relief control hydraulic motor automatic opening, realizes double protection, greatly improves security and stability.

Description

Technical Field

[0001] This utility model belongs to the field of anchor bolt and anchor cable pulling technology, and in particular relates to a hydraulic switch device for a hydraulic motor for pulling anchor bolts and anchor cables in coal mines. Background Technology

[0002] In the traction device, a hydraulic source supplies oil to the hydraulic motor to provide traction force to the traction rope. To avoid safety accidents and equipment damage caused by excessive load, a protective device is needed to control the rated load. Current solutions typically use the following approach, but it still has shortcomings:

[0003] 1. Overflow valve solution: When overloaded, the hydraulic oil overflows directly, and the motor is still in the driving state. It only relies on overflow to reduce pressure and does not cut off the oil circuit, so it cannot truly protect. Moreover, the dynamic response time is about 0.3-0.5 seconds, which cannot cope with instantaneous impact loads.

[0004] 2. Combination of electronic pressure sensor and solenoid valve: The system pressure is detected by the pressure sensor. When the pressure exceeds the limit, the PLC controls the solenoid valve to switch the oil circuit. This requires the use of a sensor, solenoid valve and controller, which is too expensive. At the same time, the anti-interference ability is poor (humid, vibrating or electromagnetic interference environment), and maintenance is difficult (electronic component failure requires professional repair, and the maintenance time is long).

[0005] 3. Mechanical clutch protection device solution: Through friction plates or jaw clutch, slippage or disengagement occurs when overloaded. This requires regular replacement of friction plates, which is costly and has low precision (the clutch trigger force is deviated and difficult to control precisely).

[0006] Overall, existing solutions suffer from low response sensitivity, poor reset reliability, and high cost, making it difficult to meet the accuracy and stability requirements of traction devices for load control. Therefore, a hydraulic pressure switch with a simple structure, rapid response, and automatic reset capability is needed. Summary of the Invention

[0007] The purpose of this invention is to provide a hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable. By designing a novel hydraulic switch, the threshold of the traction force is determined by the preload of the spring. After overload, it can control the switching of the traction force of the traction rope, the displacement of the guide wheel, the axial displacement of the valve core, and the hydraulic circuit. There are no electrical control components. Hydraulic control is achieved through a purely mechanical structure, which improves the response time, reduces the cost, requires no external power, and can completely cut off the power of the hydraulic motor to stop working. It can also actively release pressure to control the hydraulic motor to start automatically, achieving dual protection and greatly improving safety and stability.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0009] This utility model is a hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable, comprising a valve body, a valve core, a guide wheel, and a traction rope;

[0010] The valve body has a front chamber and a rear chamber at its front end and rear end, respectively. The front chamber and the rear chamber are interconnected and the connection point forms a stepped surface. The inner wall of the front chamber near the stepped surface is provided with a limiting ring.

[0011] The valve body is provided with an overflow port connecting to the rear chamber at the tail end, and a hydraulic power source port and a hydraulic motor port are provided on the circumferential side of the valve body. An oil supply channel is provided between the rear chamber and the hydraulic power source port and the hydraulic motor port.

[0012] A partition is fixed on the valve core. The valve core on both sides of the partition is an oil guide section and a sliding rod section, respectively. The oil guide section is slidably disposed in the rear chamber. The partition is slidably disposed in the front chamber and located between the limiting ring and the stepped surface. A spring sleeved on the outside of the sliding rod section is fixed between the partition and the front end of the valve body.

[0013] The oil guide section is provided with an oil guide groove along its circumferential direction, and the oil guide section is provided with an oil drain port located behind the oil guide groove on its circumferential side. The oil guide section is provided with an oil drain groove at the center of its tail end that communicates with the oil drain port.

[0014] The valve body has a through-hole on its front end face. The front end of the slide rod section passes through the through-hole and is connected to a wheel frame. The guide wheel is mounted on the wheel frame. The traction rope passes around the guide wheel. One end of the traction rope is the hydraulic motor connection end, and the other end of the traction rope is the traction end.

[0015] When the spring is in its natural state, the hydraulic power interface is connected to the hydraulic motor interface through two oil supply channels and an oil guide groove. When the spring is in its compressed state, the two oil supply channels and the oil guide groove are misaligned, and the hydraulic power interface is connected to the overflow interface through the oil supply channels, the oil outlet, the oil outlet groove, and part of the rear chamber.

[0016] Furthermore, the wheel frame includes a set of side plates, a connecting rib is provided between the two side plates, the guide wheel is fixed at the front end between the two side plates, and the tail ends of the two side plates are connected to the end of the slide rod section by a pin.

[0017] Furthermore, the tail end of the valve body is a sealed end, the front end of the valve body is an open end, and an end cap covering the front chamber is fixed to the front end of the valve body, with the through-hole located at the center of the end cap.

[0018] Furthermore, the slide bar section has a flat groove on its peripheral side, and the through-hole has a platform portion that mates with the flat groove.

[0019] Furthermore, the oil guide section has three grooves on its peripheral side, and a seal is provided between the grooves and the rear chamber. The oil guide groove and the oil outlet are located in two sealing areas formed by the three seals, respectively.

[0020] Furthermore, the valve body has two sets of mounting ports on its valve wall, and the mounting ports are T-shaped structures.

[0021] This utility model has the following beneficial effects:

[0022] This invention features a novel hydraulic switch that uses the preload of a spring to determine the threshold of traction force. Upon overload, it controls the switching of the traction rope force, guide wheel displacement, valve core axial displacement, and hydraulic circuit. With no electrical components, hydraulic control is achieved through a purely mechanical structure, improving response time, reducing costs, eliminating the need for external power, and allowing for complete disconnection of the hydraulic motor to stop operation. It also features proactive pressure relief to automatically restart the hydraulic motor, enabling the equipment to autonomously perform anchor bolt and cable pulling operations without human supervision. This dual protection significantly enhances safety and stability.

[0023] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0025] Figure 1 This is a schematic diagram of the structure of a hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable according to the present invention.

[0026] Figure 2 This is a structural schematic diagram of the present invention from a rear view.

[0027] Figure 3 This is a rear view of the structure of this utility model;

[0028] Figure 4 for Figure 3 Structural cross-sectional view at point AA;

[0029] Figure 5 for Figure 3 Structural cross-sectional view at point BB;

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1-Valve body, 2-Valve core, 3-Guide wheel, 4-Traction rope, 5-Spring, 6-Wheel frame, 101-Front chamber, 102-Rear chamber, 103-Step surface, 104-Limit ring, 105-Overflow port, 106-Hydraulic source port, 107-Hydraulic motor port, 108-Oil delivery channel, 109-Through opening, 110-End cover, 111-Mounting port, 201-Baffle plate, 202-Oil guide section, 203-Slide rod section, 204-Oil guide groove, 205-Oil drain port, 206-Oil drain groove, 207-Flat groove, 208-Groove, 601-Side plate, 602-Connecting rib, 603-Pin shaft. Detailed Implementation

[0032] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figure 1-3 As shown, this utility model is a hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable, including a valve body 1, a valve core 2, a guide wheel 3 and a traction rope 4;

[0034] The valve body 1 has a front chamber 101 and a rear chamber 102 at its front end and rear end, respectively. The front chamber 101 and the rear chamber 102 are interconnected and a stepped surface 103 is formed at the connection. A limiting ring 104 is provided on the inner wall of the front chamber 101 near the stepped surface 103.

[0035] The valve body 1 has an overflow port 105 at the tail end that connects to the rear chamber 102. The valve body 1 has a hydraulic power port 106 and a hydraulic motor port 107 on its circumferential side. The rear chamber 102 is provided with an oil supply channel 108 between the hydraulic power port 106 and the hydraulic motor port 107.

[0036] A partition 201 is fixed on the valve core 2. The valve core 2 on both sides of the partition 201 is an oil guide section 202 and a slide rod section 203, respectively. The oil guide section 202 is slidably disposed in the rear chamber 102. The partition 201 is slidably disposed in the front chamber 101 and is located between the limiting ring 104 and the stepped surface 103. A spring 5 is fixed between the partition 201 and the front end of the valve body 1 and is sleeved on the outside of the slide rod section 203.

[0037] The oil guide section 202 is provided with an oil guide groove 204 along the circumferential direction, and the oil guide section 202 is provided with an oil drain port 205 located behind the oil guide groove 204 on the circumferential side. The oil guide section 202 is provided with an oil drain groove 206 at the axial center of the tail end, which is connected to the oil drain port 205.

[0038] The valve body 1 has a through-hole 109 on the front end face. The front end of the slide rod section 203 passes through the through-hole 109 and is connected to the wheel frame 6. The guide wheel 3 is installed on the wheel frame 6. The traction rope 4 passes around the guide wheel 3. One end of the traction rope 4 is the hydraulic motor connection end. The other end of the traction rope 4 is the traction end.

[0039] When the spring 5 is in its natural state, the hydraulic power interface 106 is connected to the hydraulic motor interface 107 through two oil supply channels 108 and the oil guide groove 204. When the spring 5 is in its compressed state, the two oil supply channels 108 and the oil guide groove 204 are misaligned, and the hydraulic power interface 106 is connected to the overflow interface 105 through the oil supply channels 108, the oil outlet 205, the oil outlet groove 206 and part of the rear chamber 102.

[0040] Furthermore, the wheel frame 6 includes a set of side plates 601, with a connecting rib 602 between the two side plates 601, and the guide wheel 3 is fixed at the front end between the two side plates 601. The tail ends of the two side plates 601 are connected to the end of the slide rod section 203 through pins 603.

[0041] Among them, such as Figure 1 and Figure 4-5 As shown, the tail end of the valve body 1 is a sealed end, the front end of the valve body 1 is an open end, and the front end of the valve body 1 is fixed with an end cover 110 covering the front chamber 101. The through hole 109 is set at the axis of the end cover 110. The end cover 110 is an assembly end, which is welded and fixed after assembly and production.

[0042] Among them, such as Figure 1 and Figure 4 As shown, the slide rod section 203 has a flat groove 207 on its circumferential side, and the through-hole 109 has a platform part that cooperates with the flat groove 207, which plays a limiting role and prevents the valve core 2 from rotating.

[0043] Among them, such as Figure 4-5 As shown, the oil guide section 202 has three grooves 208 on its circumferential side. A seal is provided between the grooves 208 and the rear chamber 102. The oil guide groove 204 and the oil outlet 205 are located in the two sealing areas formed by the three seals, respectively.

[0044] Among them, such as Figure 1-2 and Figure 5 As shown, the valve body 1 has two sets of mounting ports 111 on its valve wall, and the mounting ports 111 are T-shaped structures.

[0045] Specifically, the preload of spring 5 is set to the rated traction force threshold. When the pressure on spring 5 is less than the rated value, spring 5 will not compress.

[0046] One set of hydraulic motors can simultaneously control one or more sets of anchor bolt and anchor cable pulling traction mechanisms through the hydraulic switch device of this solution.

[0047] The working principle of this utility model is as follows:

[0048] The oil port of the hydraulic motor of the traction machine is connected to the hydraulic motor interface 107 through a pipeline, and the oil port of the hydraulic source is connected to the hydraulic source interface 106 through a pipeline. This means that the hydraulic source needs to supply oil to the hydraulic motor through the valve body 1, and a pipeline is connected at the overflow interface 105 for oil recovery.

[0049] The traction rope 4 is a steel wire rope, one end of which is connected to the drive end of the hydraulic motor, and the other end is connected to the point to be pulled. The traction rope transmits the traction force to the valve core 2 through the guide wheel 3 and the wheel frame 6.

[0050] If the traction force is less than the rated value, the spring 5 is in the natural state, the hydraulic source interface 106 is connected to the hydraulic motor interface 107 through the oil supply channel 108 and the oil guide groove 204 and supplies oil, and the hydraulic motor of the traction device continues to work.

[0051] If the traction force is greater than the rated value, the tension on the guide wheel 3 and the wheel frame 6 exceeds the preload of the spring 5, compressing the spring 5 and causing the valve core 2 to move along the valve body 1. The oil supply channel 108 is displaced away from the oil guide groove 204, thereby cutting off the oil circuit between the hydraulic motor and the hydraulic source of the traction device. The oil supplied by the hydraulic source is discharged through the oil drain port 205 and the oil drain groove 206 to the overflow port 105. At this time, the hydraulic motor stops working because there is no oil supply. When the traction force is restored to less than the preload of the spring 5, the spring resets and the hydraulic motor continues to work.

[0052] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable, characterized in that: Includes valve body (1), valve core (2), guide wheel (3) and traction rope (4); The valve body (1) has a front chamber (101) and a rear chamber (102) at its front end and rear end, respectively. The front chamber (101) and the rear chamber (102) are interconnected and a stepped surface (103) is formed at the connection. A limiting ring (104) is provided on the inner wall of the front chamber (101) near the stepped surface (103). The valve body (1) is provided with an overflow port (105) at the tail end that connects to the rear chamber (102). The valve body (1) is provided with a hydraulic power source port (106) and a hydraulic motor port (107) on its peripheral side. The rear chamber (102) is provided with an oil supply channel (108) between the hydraulic power source port (106) and the hydraulic motor port (107). A partition (201) is fixed on the valve core (2). The valve core (2) on both sides of the partition (201) is an oil guide section (202) and a slide rod section (203) respectively. The oil guide section (202) is slidably disposed in the rear chamber (102). The partition (201) is slidably disposed in the front chamber (101) and located between the limiting ring (104) and the step surface (103). A spring (5) sleeved on the outside of the slide rod section (203) is fixed between the partition (201) and the front end of the valve body (1). The oil guide section (202) is provided with an oil guide groove (204) along the circumferential direction. The oil guide section (202) is provided with an oil drain port (205) located behind the oil guide groove (204) on the circumferential side. The oil guide section (202) is provided with an oil drain groove (206) at the axial center of the tail end, which is connected to the oil drain port (205). The valve body (1) has a through-hole (109) on its front end face. The front end of the slide rod section (203) passes through the through-hole (109) and is connected to a wheel frame (6). The guide wheel (3) is mounted on the wheel frame (6). The traction rope (4) passes around the guide wheel (3). One end of the traction rope (4) is the hydraulic motor connection end, and the other end of the traction rope (4) is the traction end. When the spring (5) is in its natural state, the hydraulic power source interface (106) is connected to the hydraulic motor interface (107) through two oil supply channels (108) and an oil guide groove (204). When the spring (5) is in its compressed state, the two oil supply channels (108) and the oil guide groove (204) are misaligned. The hydraulic power source interface (106) is connected to the overflow interface (105) through the oil supply channels (108), the oil outlet (205), the oil drain groove (206), and part of the rear chamber (102).

2. The hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable according to claim 1, characterized in that, The wheel frame (6) includes a set of side plates (601), and a connecting rib (602) is provided between the two side plates (601). The guide wheel (3) is fixed at the front end between the two side plates (601), and the tail ends of the two side plates (601) are connected to the end of the slide rod section (203) through a pin (603).

3. A hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable according to claim 1, characterized in that, The tail end of the valve body (1) is a sealed end, the front end of the valve body (1) is an open end, and the front end of the valve body (1) is fixed with an end cap (110) covering the front chamber (101), and the through hole (109) is located at the axis of the end cap (110).

4. A hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable according to claim 3, characterized in that, The slide bar section (203) has a flat groove (207) on its circumferential side, and the through-hole (109) has a platform part that cooperates with the flat groove (207).

5. A hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable according to claim 1, characterized in that, The oil guide section (202) has three grooves (208) on its circumferential side. The grooves (208) are sealed with the rear chamber (102). The oil guide groove (204) and the oil outlet (205) are located in the two sealing areas formed by the three seals.

6. A hydraulic switch device for a hydraulic motor of a coal mine traction anchor bolt cable according to claim 1, characterized in that, The valve body (1) has two sets of mounting ports (111) on its valve wall, and the mounting ports (111) are T-shaped.

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