CN104912863B - A single-spool two-position three-way electro-hydraulic reversing valve for hydraulic piling hammer - Google Patents

Abstract

The invention relates to a single-valve-core two-position three-way electro-hydraulic reversing valve for a hydraulic pile hammer. The technical scheme is that a valve oil distribution cover plate, a valve core body and a valve seat body actually form a hydraulic cylinder, a piston part of the hydraulic cylinder is formed on the upper surface of the valve core body, a piston part of the hydraulic cylinder is formed on the lower surface of the valve core body, a cylinder body part and a rear end cover of the hydraulic cylinder are formed on the valve oil distribution cover plate (2), and a front end cover of the hydraulic cylinder is formed on the upper part of the valve seat body; the lower part of the valve core (6) is matched with the lower part of the valve seat body to realize the opening and closing functions of the two-position three-way valve. The beneficial effects are that: due to the design of the conical sealing surface, the sealing is linear sealing in a working state, so that the leakage rate is reduced, and the volumetric efficiency of a hydraulic system is improved; due to the design of the sealing length of the slide valve, the conduction between the interlocking valve paths in the working state is avoided, the system works more reliably, the energy loss is avoided, and the advantages of interlocking between the slide valve paths and small excellent leakage of the sealing of the cone valve are achieved.

Description

A single-spool two-position three-way electro-hydraulic reversing valve for hydraulic piling hammer

technical field

The invention relates to an electro-hydraulic reversing valve and a method for a hydraulic piling hammer, in particular to a single-spool two-position three-way electro-hydraulic reversing valve for a hydraulic piling hammer.

Background technique

At present, the hydraulic reversing valves used in hydraulic piling hammers are divided into slide valves and two-position two-way cone valves according to the type of spool, and the slide valve is a gap seal with poor sealing performance. There is a certain sealing length between the spool and the valve port, so there is a dead zone in the movement of the spool valve, and there will be no instantaneous conduction between the valve circuits. The half-cone angle of the poppet valve core is generally 12°~20°. When the valve port is closed, it is line-sealed, with good sealing performance and sensitive action. It is prone to transient conduction between valve circuits.

Contents of the invention

The purpose of the present invention is to solve the above defects in the prior art, to provide a single-spool two-position three-way electro-hydraulic reversing valve for hydraulic piling hammers, which reduces the sealing length of the slide valve, retains a motion dead zone, and does not There will be a phenomenon of instantaneous connection between valve circuits; the cone valve provides sealing under working conditions, making the sealing performance good.

Its technical scheme includes electromagnetic reversing valve (1), valve oil distribution cover plate (2), valve core piston (3), upper fixing nut (4), upper valve seat (5), valve core (6), valve Seat cover (7), lower valve seat (8), lower fixing nut (9) and corresponding seals,

The upper part of the valve oil distribution cover (2) is processed with an oil hole for matching with the electromagnetic reversing valve (1) and a fixing hole for the electromagnetic reversing valve. The inside of the valve oil distribution cover (2) is a cylinder with three steps The body is used to cooperate with the two piston surfaces on the valve core piston (3) and the valve seat sleeve (7) respectively;

The spool (6) is a hollow cylinder, the spool piston (3) is a hollow cylinder with two steps, and the spool (6) and the spool piston (3) are threaded to form the spool body;

The valve seat sleeve (7) is a hollow cylinder, the inner cylinder cooperates with the valve core (6), and the outer cylinder cooperates with the valve oil distribution cover plate (2) and the valve installation hole on the oil distribution tank (10) respectively ,

The coaxial installation of the valve seat cover (7), upper valve seat (5), lower valve seat (8), upper fixing nut (4) and lower fixing nut (9) constitutes the valve seat body, and the valve core body The lower part is installed in the valve seat body, and the upper part of the valve core body is installed in the valve oil distribution cover (2); the valve oil distribution cover (2), valve core body, and valve seat body actually constitute a hydraulic cylinder, and the valve core The upper part of the body constitutes the piston part of the hydraulic cylinder, the lower part of the valve core body constitutes the piston part of the hydraulic cylinder, the valve oil distribution cover plate (2) constitutes the cylinder part and the rear end cover of the hydraulic cylinder, and the upper part of the valve seat body constitutes the hydraulic cylinder The front end cover; the lower part of the valve core (6) cooperates with the lower part of the valve seat body to realize the switching function of the two-position three-way valve.

The valve core (6) is processed with a valve core center hole (62), a valve core oil inlet channel hole (63), and a valve core oil return channel oil hole (61), wherein the upper part of the valve core center hole (62) is connected to The oil hole (61) of the spool oil return passage, the lower part is connected to the oil inlet passage hole (63) of the spool; the oil inlet passage hole (63) of the spool is used to communicate with the hydraulic oil inlet; It is used to connect the hydraulic oil to the oil return; the two ends of the cylindrical surface of the middle step of the valve core (6) are respectively processed with tapered sealing surfaces, which are used to cooperate with the sealing surfaces of the upper valve seat and the lower valve seat to form a line seal.

The two steps of the above-mentioned spool piston (3) are processed with sealing grooves for installing seals, forming two piston surfaces; the cylindrical surface of the step with a relatively large diameter is the spool piston working piston (42), and its function is to push The up and down movement of the spool; the relatively small diameter step is the spool piston balance piston (41), whose function is to balance the hydraulic force at the upper and lower ends of the spool and reduce the movement resistance of the spool.

The above-mentioned valve seat sleeve (7) is provided with a valve seat sleeve oil inlet passage hole (72), a valve seat sleeve oil return passage hole (71), and a valve seat sleeve oil inlet passage hole (72), a valve seat sleeve oil return passage hole (71) communicates with the valve core oil inlet passage hole (63) and the valve core oil return passage oil hole (61).

The upper valve seat (5) and the lower valve seat (8) above are both sleeve-shaped structures, and a tapered sealing surface is processed on the inner surface of one end of the sleeve to cooperate with the tapered sealing surface on the valve core to form a line seal; the upper valve Seat (5), following valve seat (8) are installed on the upper end and the lower end of valve seat sleeve (7) respectively, are fixed in valve seat sleeve (7) with last fixing nut (4), lower fixing nut (9).

A method for using a single-spool two-position three-way electro-hydraulic directional valve for hydraulic piling hammers mentioned in the present invention includes the following steps:

The valve oil distribution cover plate (2), the valve core body and the valve seat body form a hydraulic cylinder. (2) The cylinder part and the rear end cover of the hydraulic cylinder are formed, and the upper part of the valve seat body constitutes the front end cover of the hydraulic cylinder; the lower part of the valve core (6) cooperates with the lower part of the valve seat body to realize a two-position three-way valve switch function;

When the solenoid valve controls the spool piston to move up, the hydraulic oil inlet channel is connected to the center hole, and the dual-medium working hydraulic cylinder enters oil. When the solenoid valve controls the spool piston to move down, the hydraulic oil return channel is connected to the center hole. Through, the dual-medium working hydraulic cylinder returns oil.

The beneficial effects of the present invention are: due to the design of the tapered sealing surface, the seal is a line seal in the working state, which reduces the leakage and improves the volumetric efficiency of the hydraulic system; due to the design of the sealing length of the slide valve, there is a deadlock in the transition between working states zone, avoiding the conduction between the interlocking valve circuits during the working state, making the system work more reliably and avoiding energy loss; thus, the present invention has the advantages of both the interlocking between the slide valve passages and the excellent sealing of the cone valve and small leakage.

Description of drawings

Fig. 1 is a structural diagram of the present invention;

Fig. 2 is the structural diagram of valve cover plate of the present invention;

Fig. 3 is the A-A structural diagram of valve cover plate of the present invention;

Fig. 4 is a spool structural diagram of the present invention;

Fig. 5 is the spool piston structural diagram of the present invention;

Fig. 6 is a structural diagram of a valve seat sleeve of the present invention;

In the above picture: electromagnetic reversing valve 1, valve oil distribution cover plate 2, valve core piston 3, upper fixing nut 4, upper valve seat 5, valve core 6, valve seat sleeve 7, lower valve seat 8, lower fixing nut 9 , oil distribution tank 10, spool piston balance piston 41, spool piston working piston 42, spool oil return channel hole 61, spool center hole 62, spool oil inlet channel hole 63, spool upper sealing cone 64, The lower sealing cone surface 65 of the valve core, the oil return channel hole 71 of the valve seat cover, and the oil inlet channel hole 72 of the valve seat cover.

detailed description

As shown in Figure 1, the single-spool two-position three-way electro-hydraulic reversing valve for hydraulic piling hammer mentioned in the present invention includes an electromagnetic reversing valve 1, a valve oil distribution cover plate 2, a valve core piston 3, an upper fixed Nut 4, upper valve seat 5, valve core 6, valve seat cover 7, lower valve seat 8, lower fixing nut 9, oil distribution compartment 10, wherein the valve core is provided with a valve core oil return passage hole 61, a valve core center Hole 62, spool oil inlet passage hole 63, are designed with valve seat cover oil return passage hole 71, valve seat cover oil inlet passage hole 72 at valve seat cover.

As shown in FIG. 1 , the solenoid valve 1 is installed on the upper surface of the valve oil distribution cover plate 2 through bolts.

As shown in Figure 2-3, the upper part of the valve oil distribution cover plate 2 is processed with an oil hole that matches the electromagnetic reversing valve 1 and a fixing hole for the electromagnetic reversing valve 1. The inside of the valve oil distribution cover plate 2 is a cylinder with three steps. , which are respectively used to cooperate with the two piston surfaces on the valve core piston and with the valve seat sleeve. In addition, oil holes are processed inside the valve oil distribution cover for the oil inlet and return of the electromagnetic reversing valve 1, and the electromagnetic reversing valve The working hydraulic oil controlled by valve 1 is directed to the upper and lower chambers of the working piston in the spool piston 3 .

As shown in FIG. 4 , the valve core 6 is a hollow cylinder, on which a central oil hole 62 , an oil inlet channel oil hole 63 , and an oil return channel oil hole 61 are processed. As shown in FIG. 1 , the central oil hole is connected to 62 working oil holes; the oil inlet channel oil hole 63 is used to communicate with hydraulic oil inlet; the oil return channel oil hole 61 is used to communicate with hydraulic oil to return oil. The two ends of the cylindrical surface of the middle step of the valve core are respectively processed with tapered seals, 64 and 65, which are used to cooperate with the sealing surfaces of the upper valve seat 5 and the lower valve seat 8 to form a line seal.

As shown in FIG. 5 , the spool piston is a hollow cylinder with two steps, and sealing grooves for installing seals are processed on the steps to form two pistons 41 , 42 . The cylindrical surface of the step with a relatively large diameter is the working piston 42, whose function is to push the valve core to move up and down; the step with a relatively small diameter is the balance piston 41, whose function is to balance the hydraulic force at the upper and lower ends of the spool and reduce the pressure of the spool. Movement resistance.

As shown in Figure 6, the valve seat cover 7 is a hollow cylinder, the inner cylinder cooperates with the valve core, and the outer cylinder cooperates with the valve cover plate and the valve mounting holes on the oil distribution tank respectively. Valve seat cover 7 is also designed with oil inlet passage oil hole 72, oil return passage oil hole 71, these oil inlet passage oil hole 72, oil return passage oil hole 71 and the oil inlet passage oil hole 63 on the spool 6, oil return passage The passage oil hole 61 has a definite positional relationship.

The upper valve seat and the lower valve seat are both sleeve-shaped structures, and a tapered sealing surface is processed on the inner surface of one end of the sleeve, which is used to cooperate with the tapered sealing surface on the valve core to form a line seal.

As shown in Figure 1, the spool 6 and the spool piston 4 form the spool body after being threadedly connected, and the upper valve seat 5 and the lower valve seat 8 are installed on the upper and lower ends of the valve seat sleeve 7 respectively, with the upper fixing nut 4, The lower fixing nut 9 is fixed in the valve seat sleeve 7 . Seat cover 7, upper valve seat 5, lower valve seat 8, upper fixing nut 4, lower fixing nut 9 are coaxially installed to form the valve seat body, the lower part of the valve core body is installed in the valve seat body, and the upper part of the valve core body is installed in the cover board.

The method of using the single spool two-position three-way electro-hydraulic reversing valve mentioned in the present invention is:

As shown in Figure 1, the cover plate 2, the valve core body and the valve seat body actually constitute a hydraulic cylinder, the upper part of the valve core body constitutes the piston part of the hydraulic cylinder, the lower part of the valve core 6 constitutes the piston rod part of the hydraulic cylinder, and the cover The plates form the body portion and rear end cap of the hydraulic cylinder. The top of the valve seat cover 7 constitutes the front end cover of the hydraulic cylinder. The lower part of the valve core 6 cooperates with the lower part of the valve seat cover 7 to realize the switching function of the two-position three-way valve. When the solenoid valve controls the spool piston 42 to move up, the hydraulic oil inlet passage is connected to the center hole, and the dual-medium working hydraulic cylinder enters oil; when the solenoid valve controls the spool piston 42 to move down, the hydraulic oil return passage connects to the center hole. The hole is connected, and the dual-medium working hydraulic cylinder returns oil.

The advantages of the single-spool two-position three-way electro-hydraulic reversing valve mentioned in the present invention are:

At the same time, it has the advantages of excellent sealing between slide valve passages and excellent sealing of cone valves and small leakage.

The above is only a preferred embodiment of the present invention, and is not a limitation on the form of the present invention. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention belong to the scope of the technical solution of the present invention within.

Claims (3)

1. A single-spool two-position three-way electro-hydraulic directional valve for hydraulic piling hammers, which is characterized in that it includes an electromagnetic directional valve (1), a valve oil distribution cover (2), and a spool piston (3) , upper fixing nut (4), upper valve seat (5), valve core (6), valve seat sleeve (7), lower valve seat (8), lower fixing nut (9) and corresponding seals, the The upper part of the valve oil distribution cover (2) is processed with an oil hole for matching with the electromagnetic reversing valve (1) and a fixing hole for the electromagnetic reversing valve. The inside of the valve oil distribution cover (2) is a cylinder with three steps. Cooperate with the two piston surfaces on the spool piston (3) and the valve seat sleeve (7) respectively; the spool (6) is a hollow cylinder, and the spool piston (3) has two steps The hollow cylinder of the valve core (6) and the valve core piston (3) constitute the valve core body after threaded connection; the valve seat cover (7) is a hollow cylinder, and the inner cylinder and the valve core (6) Cooperate, the outer cylinder is respectively matched with the valve installation hole on the valve oil distribution cover plate (2) and the oil distribution tank (10); the valve seat cover (7), upper valve seat (5), lower valve seat ( 8) The coaxial installation of the upper fixing nut (4) and the lower fixing nut (9) constitutes the valve seat body, the lower part of the valve core body is installed in the valve seat body, and the upper part of the valve core body is installed in the valve oil distribution cover plate (2) Inside; the valve oil distribution cover plate (2), valve core body and valve seat body actually constitute a hydraulic cylinder, the upper part of the valve core body constitutes the piston part of the hydraulic cylinder, and the lower part of the valve core body constitutes the piston rod of the hydraulic cylinder The valve oil distribution cover plate (2) constitutes the cylinder body part and the rear end cover of the hydraulic cylinder, and the upper part of the valve seat body constitutes the front end cover of the hydraulic cylinder; the lower part of the valve core (6) cooperates with the lower part of the valve seat body , to realize the switching function of the two-position three-way valve. 2. The single-spool two-position three-way electro-hydraulic reversing valve for hydraulic piling hammers according to claim 1, characterized in that: the valve core (6) is processed with a valve core center hole (62) and a valve The oil inlet passage hole (63) of the spool and the oil return passage hole of the spool (61), wherein, the upper part of the center hole of the spool (62) is connected to the oil hole (61) of the oil return passage of the spool, and the lower part is connected to the oil inlet passage of the spool hole (63); the spool oil inlet channel hole (63) is used to connect the hydraulic oil inlet; the spool oil return channel oil hole (61) is used to connect the hydraulic oil return oil; The ends are respectively processed with tapered sealing surfaces, which are used to cooperate with the sealing surfaces of the upper valve seat and the lower valve seat to form a line seal. 3. The single-spool two-position three-way electro-hydraulic reversing valve for hydraulic piling hammers according to claim 1, characterized in that: the two steps of the valve core piston (3) are processed with seals for installation. The sealing groove of the parts forms two piston surfaces; the step cylindrical surface with a relatively large diameter is the working piston (42) of the spool piston, and its function is to push the spool to move up and down; the step with a relatively small diameter is the balance piston of the spool piston ( 41), its function is to balance the hydraulic force at the upper and lower ends of the spool and reduce the movement resistance of the spool.