CN207568968U - A kind of stroke valve module and multistage hydraulic cylinder - Google Patents

Abstract

The utility model is related to a kind of stroke valve module and multistage hydraulic cylinders, including Cartridge inserted valve integrated block, stroke valve, first oil circuit, second oil circuit, seal block piece, mandril and interface channel, the stroke valve is arranged in Cartridge inserted valve integrated block, interface channel passes through the first oil circuit and the second oil circuit, first, second oil circuit is connected by interface channel, mandril is arranged in interface channel, sealing block piece is arranged between stroke valve and mandril, mandril promotion sealing block piece makes sealing block piece in an open position or blocking position, when sealing block piece is located at open position, first, second oil communication, when seal block piece be located at blocking position when first, second oil circuit is closed.A kind of stroke valve module of the utility model can control the run action sequence of the double-acting multilevel oil cylinder of rod end oil inlet, while extend Multi-stage cylinder seal durability；Furthermore, it is not necessary that the processing radial direction oil-through-hole on piston rods at different levels, effectively eliminates the hidden danger that sealing element vias at different levels are worn.

Description

A stroke valve assembly and a multi-stage hydraulic cylinder

technical field

The utility model relates to the technical field of hydraulic cylinder control, in particular to a stroke valve assembly and a multistage hydraulic cylinder.

Background technique

The internal structure of the double-acting multi-stage hydraulic cylinder with oil fed from the end of the conventional piston rod can ensure that the hydraulic cylinder is extended and retracted sequentially under load. Figure 1 shows the structure of a conventional multi-stage hydraulic cylinder. Each hydraulic cylinder has a piston rod. Piston rod extension: pressure oil enters from the oil port at the rod end of the hydraulic cylinder, and enters the rodless chamber 10 at each level through the oil guide pipe 60, and the piston rods at all levels extend sequentially; piston rod retracts: the pressure oil enters from the oil port at the rod end of the hydraulic cylinder Enter, enter the rod cavity 40 at each level through the inner cavity 50 of the piston rod at the first level and the radial hole 30 of the piston rod at each level.

The disadvantage of conventional multi-stage hydraulic cylinders is that during the retraction process of the piston rod, once the piston seal passes through the radial hole, the rod chamber of this stage is connected with the rod chamber of the upper stage immediately, and the piston rod of this stage has not yet retracted to its position , the piston rod of the upper stage has begun to retract, and the piston rods of all levels can be retracted to the position when the piston rod of the uppermost stage is retracted in place; at the same time, due to the reciprocating operation of the piston rod, the combined seal All the parts will pass through the radial oil hole, frequent work will easily cause the seal to wear and fail, internal leakage will occur, and the service life of the hydraulic cylinder will be shortened.

Utility model content

In order to solve the problems of the prior art, the utility model provides a stroke valve assembly which does not need to provide a radial oil hole on the piston rod, and solves the problems of sequential recovery of piston rods at all levels and wear and tear of seals at all levels. Multi-stage hydraulic cylinder.

The specific technical solution is as follows: a stroke valve assembly, including a cartridge valve block, a stroke valve, a first oil circuit, a second oil circuit, a sealing block, a push rod and a connecting channel, and the stroke valve is arranged on the cartridge valve block Among them, the connecting passage passes through the first oil passage and the second oil passage, the first and second oil passages communicate through the connecting passage, the ejector rod is arranged in the connecting passage, the sealing block is arranged between the travel valve and the ejector rod, and the ejector The rod pushes the sealing stopper so that the sealing stopper is in the open position or blocking position. When the sealing stopper is in the open position, the first and second oil passages are connected. When the sealing stopper is in the blocking position, the first and second oil passages are connected. Road closed.

Below is the subsidiary technical scheme of the utility model.

As a preferred solution, the stroke valve includes a valve body, a base, a spring and a slider, the base and the slider are arranged in the valve body, the spring is arranged between the base and the slider, and the sealing stopper is arranged On the axial side of the slider.

As a preferred solution, the base has a protruding portion, and the spring is sleeved on the protruding portion.

As a preferred solution, the ejector rod includes a rod body, the rod body is located in the connecting channel, and the diameter of the rod body is smaller than the diameter of the connecting channel.

As a preferred solution, an expansion cavity is provided between the connecting channel and the first oil passage, and the diameter of the expanding cavity is larger than that of the connecting channel.

As a preferred solution, the slider includes a convex portion, and the convex portion is in contact with the sealing stopper.

A multi-stage hydraulic cylinder, comprising a stroke valve assembly, piston rods of each stage, a rod cavity and a rodless cavity, the stroke valve assembly is arranged at the end of the piston rod of each stage, and the first oil circuit communicates with the rod cavity of the stage, The second oil passage communicates with the upper-stage rod chamber.

As a preferred solution, the cartridge valve block of the stroke valve assembly is arranged at the ends of the piston rods of each stage.

As a preferred solution, the ejector rod includes a contact end, and the contact end of the ejector rod of the current stage is in contact with the piston rod of the upper stage.

The technical effect of the utility model: a stroke valve assembly of the utility model can control the operation sequence of the double-acting multi-stage oil cylinder with the rod end feeding oil, and at the same time prolong the service life of the seals of the multi-stage cylinder; The radial oil hole is processed on the piston rod, which effectively eliminates the hidden danger of wear of the seals at all levels.

Description of drawings

Fig. 1 is a structural diagram of an existing multi-stage hydraulic cylinder in the background technology of the utility model.

Fig. 2 is a schematic diagram of a sealing stopper of a stroke valve assembly in an embodiment of the present invention at a blocking position.

Fig. 3 is a schematic diagram of a sealing stopper of a travel valve assembly in an open position according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a multi-stage hydraulic cylinder according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a travel valve assembly according to an embodiment of the present invention.

Detailed ways

Below, the substantive features and advantages of the utility model are further described in conjunction with examples, but the utility model is not limited to the listed embodiments.

As shown in Figures 2 to 5, a travel valve assembly of this embodiment includes a cartridge valve block 1, a travel valve 2, a first oil passage 3, a second oil passage 4, a sealing stopper 5, a push rod 6 and The connecting passage 7, the stroke valve 2 is arranged in the cartridge valve block 1 . The connecting passage 7 passes through the first oil passage and the second oil passage, and the first and second oil passages communicate through the connecting passage 7 . The ejector rod 6 is arranged in the connecting channel 7, and the sealing stopper 5 is arranged between the travel valve 2 and the ejector rod 6. The ejector rod 6 pushes the sealing stopper to make the sealing stopper be in the open position or the blocking position. When the sealing stopper is in the When in the open position, the first and second oil passages are connected, and when the sealing stopper is in the blocking position, the first and second oil passages are closed. In the above technical solution, the ejector rod can move in the connecting passage, and by pushing the ejector rod, the ejector rod can drive the sealing stopper to slide, so that the sealing stopper can connect or close the first and second oil passages, thereby controlling the first and second oil passages. On-off of the second oil circuit. In this embodiment, the sealing stopper is a sphere.

In this embodiment, the stroke valve 2 includes a valve body 21, a base 22, a spring 23 and a slider 24, the base 22 and the slider 24 are arranged in the valve body, and the spring 23 is arranged on the base and the slider Between, the sealing stopper 5 is arranged on the axial side of the slider. Through the above technical solution, the spring is compressed after the push rod is stressed, so that the sealing stopper is in the open position, and the spring reset can make the sealing stopper be in the blocking position.

In this embodiment, the base 22 has a protruding portion 221 , and the spring is sleeved on the protruding portion.

In this embodiment, the ejector rod 6 includes a rod body 61 located in the connecting channel 7 , and the diameter of the rod body is smaller than that of the connecting channel, so that fluid can flow through the gap between the rod body and the connecting channel.

In this embodiment, an expansion cavity 71 is provided between the connection channel 7 and the first oil passage 3 , and the diameter of the expansion cavity 71 is larger than that of the connection channel. Therefore, the sealing stopper can enter into the expansion cavity, and the connection channel is blocked.

In this embodiment, the slider 24 includes a convex portion 241, and the convex portion 241 is in contact with the sealing stopper.

A multi-stage hydraulic cylinder in this embodiment includes the above-mentioned stroke valve assembly, piston rods of various levels, rod chambers and rodless chambers, the stroke valve assembly is arranged at the end of each piston rod, and the first oil circuit 3 is connected to this cylinder. The first stage is communicated with the rod chamber, and the second oil passage 4 is communicated with the upper stage rod chamber. In the above technical scheme, stroke valve components are installed at the ends of the piston rods at all levels, and are effectively connected by means of bolt connection and end face sealing to control the on-off of the oil in the rod chamber 8 of the current stage and the rod chamber 9 of the upper stage. When the stroke of the rod is in place, the end surface of the stroke valve assembly is flattened and pushes away the stroke valve stem of the upper piston rod balance valve assembly, and the oil circuit is connected step by step to ensure the recovery sequence of the piston rod. This structural form does not need to process radial oil holes on the piston rods at all levels, effectively eliminating the hidden danger of wear through holes of the seals at all levels.

In this embodiment, the cartridge valve block 1 of the stroke valve assembly is arranged at the ends of the piston rods of each stage. The ejector rod 6 includes a contact end 62, and the contact end of the ejector rod of this stage is in contact with the piston rod of the upper stage.

In the multi-stage hydraulic cylinder of this embodiment, when the piston rod is stretched out: the pressure oil enters from the oil port at the rod end of the hydraulic cylinder, and enters the rodless cavity of each level through the oil guide pipe. When the end face of the rod stroke valve assembly is separated from the end face of the upper stage stroke valve assembly, the stroke valve rod extends out of the first oil circuit and the second oil circuit is closed under the action of the spring force. When the piston rod is retracted: the pressure oil enters from the oil port at the rod end of the hydraulic cylinder, and enters the rod cavity at each stage through the internal oil passage and stroke valve assembly of the piston rod of the corresponding stage; specifically, during the retraction process of the piston rod, the pressure oil passes through The oil circuit enters the first oil circuit of the stroke valve. When the retracted piston rod pushes away the stroke valve ejector rod 6, the first oil circuit and the second oil circuit of the stroke valve are connected, that is, the rod chamber of this stage is connected to the upper The rod chamber of the first stage is connected to complete the sequential retraction of the piston rod. The rod chamber of this stage and the rod chamber of the upper stage are only connected when the piston rod of this stage is running in place and the stroke valve ejector rod is pushed open. In addition, the stroke valve also plays a role of safety protection, realizing overpressure protection for the rod chamber of the upper stage.

A stroke valve assembly of this embodiment can control the operating action sequence of the double-acting multi-stage oil cylinder with the rod end feeding oil, and prolong the service life of the seals of the multi-stage cylinder at the same time; The oil through hole effectively eliminates the hidden danger of through hole wear of seals at all levels.

It should be pointed out that the above-mentioned preferred embodiments are only to illustrate the technical conception and characteristics of the present utility model, and its purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and not to limit this utility model. Protection scope of utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (9)

1. A travel valve assembly, characterized in that it includes a cartridge valve block, a travel valve, a first oil circuit, a second oil circuit, a sealing retainer, a push rod and a connecting channel, and the travel valve is arranged on the cartridge valve In the block, the connecting passage passes through the first oil passage and the second oil passage, the first and second oil passages communicate through the connecting passage, the ejector rod is arranged in the connecting passage, and the sealing block is arranged between the travel valve and the ejector rod, The push rod pushes the sealing stopper so that the sealing stopper is in the open position or blocking position. When the sealing stopper is in the open position, the first and second oil passages are connected. When the sealing stopper is in the blocking position, the first and second The oil circuit is closed. 2. The stroke valve assembly according to claim 1, wherein the stroke valve comprises a valve body, a base, a spring and a slider, the base and the slider are arranged in the valve body, and the spring is arranged on the base Between the seat and the slider, the sealing stopper is arranged on the axial side of the slider. 3. The stroke valve assembly according to claim 2, wherein the base has a protruding portion, and the spring is sleeved on the protruding portion. 4 . The stroke valve assembly according to claim 1 , wherein the ejector rod comprises a rod body, the rod body is located in the connecting channel, and the diameter of the rod body is smaller than the diameter of the connecting channel. 5 . The stroke valve assembly according to claim 1 , wherein an expansion cavity is provided between the connecting passage and the first oil passage, and the diameter of the expansion cavity is larger than that of the connecting passage. 6. The stroke valve assembly according to claim 2, wherein the slider comprises a convex portion, and the convex portion is in contact with the sealing stopper. 7. A multi-stage hydraulic cylinder, characterized in that it comprises the stroke valve assembly according to any one of claims 1 to 6, piston rods at all levels, rod chambers and rodless chambers, and the stroke valve assembly is arranged in each The end of the piston rod of the first stage, the first oil passage communicates with the rod chamber of the current stage, and the second oil passage communicates with the rod chamber of the upper stage. 8. The multi-stage hydraulic cylinder according to claim 7, characterized in that, the cartridge valve block of the travel valve assembly is arranged at the ends of the piston rods of each stage. 9. The multi-stage hydraulic cylinder according to claim 8, wherein the ejector rod includes a contact end, and the contact end of the ejector rod of the current stage is in contact with the piston rod of the upper stage.