Reversing valve for crane

Abstract

The reversing valve for the crane comprises a valve body, a valve element is arranged in the valve body in a sliding mode, gland assemblies are arranged on the two sides of the valve body, each gland assembly comprises a gland and a screw plug, each gland is provided with a through hole, each screw plug is detachably connected with the corresponding gland through the corresponding through hole, and the reversing valve is simple in structure, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulically controlled reversing valves, in particular to a reversing valve for cranes. Background Art

[0002] With the continuous development of social economy, hydraulic control equipment has been used in many industries such as construction, manufacturing, and transportation, especially in large equipment such as cranes. The reversing valve is an important component in hydraulic control equipment. It controls the equipment by changing the flow direction of the liquid, thereby meeting the application of the equipment in different scenarios. Regular inspections are required to prevent sudden shutdowns caused by reversing valve failures. During the inspection process, the reversing valve generally needs to be disassembled for inspection, which adds inconvenience to the inspection.

[0003] For example, a patent document with patent application number 202223570163.2 and announcement date 2023.04.28 discloses an ultra-high-pressure hydraulically controlled one-way valve. The hydraulically controlled one-way valve comprises a valve body, an oil inlet connecting nozzle, an oil discharge connecting nozzle, a front pressure cover, a rear pressure cover, a control piston, an oil outlet connecting nozzle and a valve core assembly; wherein the valve core assembly comprises a valve sleeve, an outer valve core, an inner valve core, a spring seat and a spring; the inner valve core is composed of a valve stem and a tapered plug, and a plurality of flat keys are provided on the side wall of the valve stem; a sealing gasket is embedded in the front end of the valve body, and the hydraulically controlled one-way valve is equipped with an assembleable valve sleeve, and the valve sleeve is assembled in the original valve core assembly cavity, and the valve core slides in the valve sleeve. When wear occurs, there is no need to replace the valve body as a whole, and only a new valve sleeve needs to be replaced, which provides convenience for the maintenance of the hydraulically controlled one-way valve and reduces the maintenance cost of the equipment. The hydraulically controlled one-way valve is equipped with a sealing gasket at the end of the valve sleeve assembly cavity, and a rigid seal is achieved by squeezing the sealing gasket through the assembly pressure of the front pressure cover.

[0004] In the above literature, a front gland and a rear gland are fixedly installed on the front and rear sides of the valve body respectively. When the equipment controlled by the one-way valve stops running and the equipment parts need to be checked one by one, when checking the one-way valve to see whether the valve core can operate according to the expected trajectory in the valve body, the front gland and the rear gland on the valve body can only be removed. The disassembly process requires professional tools and is time-consuming, which may affect the normal operation of the equipment. Frequent disassembly may cause wear of the gland and the valve body, thereby reducing the sealing performance of the valve, further increasing the difficulty of maintenance. Summary of the Invention

[0005] The utility model provides a reversing valve for a crane, which is convenient for inspection and maintenance and has a simple structure.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a reversing valve for a crane, comprising a valve body, a valve core is slidingly arranged in the valve body, a gland assembly is arranged at both ends of the valve body, the gland assembly includes a gland and a screw plug, the gland is provided with a through hole, the screw plug is detachably connected to the gland through the through hole, and the axis of the through hole is in the same straight line as the axis of the valve core.

[0007] The above setting is that pressure covers are provided on both sides of the valve body, a through hole is provided in the middle of the pressure cover, and a screw plug is provided in the through hole. The setting of the screw plug can ensure the air tightness between the pressure cover and the valve body. At the same time, when inspection is needed, the screw plug on one side of the pressure cover is removed. Since the axis of the screw plug and the axis of the valve core are on the same straight line, it is possible to observe whether the valve core is offset to one side through the position of the screw plug, thereby observing whether the movement trajectory of the valve core is stuck, and thus judging the working condition of the valve core during operation, so that it is convenient to check whether the reversing valve is in normal working condition and perform maintenance, and the structure is simple.

[0008] Furthermore, the gland is provided with a flange toward the inner side of the valve body, and the flange is matched and connected with both ends of the valve body.

[0009] In the above arrangement, the gland is provided with a flange toward the inner side of the valve body, and one end face of the flange abuts against one end face of the inner side of the valve body. The abutment between the flange and the valve body completes the position limiting of the gland, preventing the gland from longitudinal displacement under liquid pressure.

[0010] Furthermore, a groove is provided in the middle of the gland, and the gland assembly further comprises an elastic member, one end of the elastic member is connected to the valve core, and the other end of the elastic member is connected to the gland via the groove.

[0011] In the above setting, an elastic part is provided between the pressure cover and the valve core. When the reversing valve stops working during pressure relief, the valve core can be restored to its original position under the action of the elastic part. When the valve core moves to one side, the elastic part on the other side of the valve core is squeezed, and the thrust acting on the valve core increases and the thrust direction is opposite to the direction of movement of the valve core. Therefore, the elastic part can absorb and alleviate the impact force caused by pressure changes, thereby protecting the internal structure of the valve body. In addition, a groove is provided in the middle of the pressure cover, which can conveniently accommodate and limit the elastic part.

[0012] Furthermore, the screw plug is divided into a boss portion and an insertion portion, the lower bottom surface of the boss portion abuts against one end surface of the pressure cover, and the insertion portion is flush with the bottom height of the groove.

[0013] In the above arrangement, the arrangement of the boss portion can limit the screw plug to prevent the screw plug from extending too long into the interior of the pressure cover. The screw plug is also provided with an insertion portion. When the insertion portion is flush with the height of the bottom of the groove, the contact between the screw plug and the outside is reduced, thereby ensuring that the screw plug can better maintain stability when subjected to pressure or vibration, and after the insertion portion is inserted into the through hole, the end of the insertion portion is flush with the plane where the bottom of the groove is located, and the screw plug will not extend out of the through hole and will not affect the normal operation of the elastic member.

[0014] Furthermore, the valve core, the elastic member and the screw plug have the same axis.

[0015] With the above arrangement, when the valve core is pushed through the through hole, the axes of the valve core, the elastic member and the screw plug are aligned, so that when the elastic member acts on the valve core, the valve core can move more smoothly, reducing wear and sticking caused by eccentric force, thereby extending the service life of the reversing valve.

[0016] Furthermore, the exterior of the lower side wall of the valve body is provided with at least one oil inlet lumen, the interior of the lower side wall of the valve body is provided with at least one oil inlet lumen, and the upper side wall of the valve body is provided with at least two oil outlet lumen.

[0017] The above setting, in which multiple oil inlet and outlet cavities are set on different side walls of the valve body, can achieve more accurate flow distribution. Multiple oil inlet and outlet cavities are integrated in one valve body, which can simplify the pipeline layout of the hydraulic system and reduce the complexity of the oil circuit system.

[0018] Furthermore, a first oil passage is provided between the outer portion of the lower side wall of the valve body and the flange.

[0019] In the above arrangement, a first oil passage is provided between the outer portion of the lower side wall of the valve body and the flange, and liquid can flow into the groove through the first oil passage, providing stable conditions for subsequent liquid distribution and pressure regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the present utility model.

[0021] Figure 2 This is a cross-sectional view of the pressure cover in the utility model.

[0022] Explanation of the accompanying figures: 1-valve body; 11-oil outlet pipe cavity; 12-oil inlet pipe cavity; 2-pressure cover; 21-groove; 22-flange; 23-through hole; 3-screw plug; 31-boss portion; 32-extending portion; 4-elastic member; 5-first oil circuit; 6-valve core. DETAILED DESCRIPTION

[0023] like Figure 1-2As shown, a reversing valve for a crane includes a valve body 1, a valve core 6 is slidingly arranged in the valve body 1, and a gland assembly is arranged on both sides of the valve body 1. The gland assembly includes a gland 2, a screw plug 3, and an elastic member 4. The gland 2 is provided with a through hole 23, and the screw plug 3 is detachably connected to the gland 2 through the through hole 23. Glands 2 are provided at both ends of the valve body 1, a through hole 23 is provided in the middle of the gland 2, and a screw plug 3 is provided in the through hole 23. The axis of the through hole 23 and the axis of the valve core 6 are on the same straight line. In order to further ensure the airtightness between the screw plug 3 and the through hole 23, a sealing ring can be provided between the screw plug 3 and the through hole 23 to achieve sealing, thereby ensuring the airtightness between the gland 2 and the valve body 1. When inspection is required, the screw plug 3 on the gland 2 is removed to observe whether the movement trajectory of the valve core 6 is stuck, thereby judging the working condition of the valve core 6 during operation.

[0024] like Figure 1 As shown, one end of the elastic member 4 is connected to the valve core 6, and the other end of the elastic member 4 is connected to the gland 2 through the groove 21. An elastic member 4 is provided between the gland 2 and the valve core 6. When the reversing valve stops working during pressure relief, the valve core 6 can be restored to its original position under the action of the elastic member 4. When the valve core 6 moves to one side, the elastic member 4 on the other side of the valve core 6 is squeezed, and the thrust acting on the valve core 6 increases and the thrust direction is opposite to the moving direction of the valve core 6. Therefore, the elastic member 4 can absorb and alleviate the impact force caused by the pressure change, thereby protecting the internal structure of the valve body 1. In this embodiment, the elastic member is a spring.

[0025] The screw plug 3 includes a boss portion 31 and an insertion portion 32. The lower bottom surface of the boss portion 31 abuts against one end surface of the pressure cover 2. The end of the insertion portion 32 after extending into the through hole is flush with the plane where the bottom of the groove 21 is located. The setting of the boss portion 31 can limit the screw plug 3 to prevent the screw plug 3 from extending too long into the pressure cover 2. The screw plug 3 is also provided with an insertion portion 32. When the insertion portion 32 is flush with the plane where the bottom of the groove 21 is located, the contact between the screw plug 3 and the outside is reduced, thereby ensuring that the screw plug 3 can better maintain stability when subjected to pressure or vibration, and the insertion portion 32 is flush with the plane where the bottom of the groove 21 is located, and the screw plug 3 will not affect the normal operation of the elastic member 4.

[0026] like Figure 1 As shown, the axes of the valve core 6, the elastic member 4 and the screw plug 3 are consistent. When the valve core 6 is pushed through the through hole 23, the axes of the valve core 6, the elastic member 4 and the screw plug 3 are consistent, so that when the elastic member 4 acts on the valve core 6, the valve core 6 can move more smoothly, reducing wear and sticking caused by eccentric force, thereby extending the service life of the reversing valve.

[0027] At least one oil inlet lumen 12 is opened on the outside of the lower side wall of the valve body 1, at least one oil outlet lumen 11 is opened on the inside of the lower side wall of the valve body 1, and at least two oil outlet lumen 11 are opened on the upper side wall of the valve body 1. Multiple oil inlet lumen 12 and oil outlet lumen 11 are arranged on different side walls of the valve body 1, which can achieve more accurate flow distribution. Multiple oil inlet and outlet lumen 11 are integrated in one valve body 1, which can simplify the pipeline layout of the hydraulic system and reduce the complexity of the oil circuit system.

[0028] A first oil circuit 5 is provided between the outer portion of the lower side wall of the valve body 1 and the flange 22. A first oil circuit 5 is provided between the outer portion of the lower side wall of the valve body 1 and the flange 22. Liquid can flow into the groove 21 through the first oil circuit 5, providing stable conditions for subsequent liquid distribution and pressure regulation.

[0029] like Figure 2 As shown, the gland 2 is provided with a flange 22 toward the inner side of the valve body 1, and a groove 21 is provided in the middle of the gland 2. The gland 2 is provided with a flange 22 toward the inner side of the valve body 1, and one end face of the flange 22 abuts against an end face of the inner side of the valve body 1. The flange 22 abuts against the valve body 1 to complete the positioning of the gland 2, and then the gland 2 is fixed with screws on the outer side surface to prevent the gland 2 from longitudinal displacement under the liquid pressure. A groove 21 is provided in the middle of the gland 2, so that the liquid can flow into the groove 21 through the valve body 1. The gradual accumulation of the liquid in the groove 21 requires a larger space, thereby pushing the valve core 6 to move.

[0030] The working principle of the utility model is as follows: a valve core 6 is slidingly arranged in the valve body 1, and pressure covers 2 are arranged on both sides of the valve body 1. An elastic member 4 is arranged between the pressure cover 2 and the valve core 6. A through hole 23 is arranged in the middle of the pressure cover 2, and the screw plug 3 is detachably connected to the pressure cover 2 through the through hole 23. When the valve core 6 in the valve body 1 needs to be inspected, it is only necessary to remove the screw plug 3 on the pressure cover 2 on one side, and move the valve core toward the pressure cover 2 on the removed side to observe whether the movement trajectory of the valve core 6 is stuck, so as to judge the working condition of the valve core 6 during operation, and then check the valve core and facilitate timely maintenance. When observation is not needed, the screw plug 3 is installed back into the through hole 23 of the pressure cover 2.

Claims

1. A reversing valve for a crane, comprising a valve body, wherein a valve core is slidably disposed in the valve body, and characterized in that: Gland assemblies are provided at both ends of the valve body. The gland assemblies include a gland and a screw plug. The gland is provided with a through hole. The screw plug is detachably connected to the gland through the through hole. The axis of the through hole is in the same straight line as the axis of the valve core.

2. A reversing valve for a crane according to claim 1, characterized in that: The gland is provided with a flange toward the inner side of the valve body, and the flange is matched and connected with both ends of the valve body.

3. The reversing valve for crane according to claim 1, characterized in that: A groove is provided in the middle of the gland. The gland assembly further comprises an elastic member, one end of which is connected to the valve core, and the other end of which is accommodated in the groove and connected to the gland.

4. A reversing valve for a crane according to claim 2, characterized in that: The screw plug includes a boss portion and an insertion portion, wherein the lower bottom surface of the boss portion abuts against one end surface of the pressure cover, and the insertion portion is inserted into the through hole and is flush with the plane where the bottom of the groove is located.

5. The reversing valve for crane according to claim 1, characterized in that: The valve core, the elastic member and the screw plug have the same axis.

6. The reversing valve for crane according to claim 1, characterized in that: The lower side wall of the valve body is provided with at least one oil inlet cavity on the outside, the lower side wall of the valve body is provided with at least one oil outlet cavity on the inside, and the upper side wall of the valve body is provided with at least two oil outlet cavities.

7. The reversing valve for a crane according to claim 6, characterized in that: A first oil passage is provided between the outer portion of the lower side wall of the valve body and the flange.

Images