Valve body structure of prefill valve of oil press

Abstract

The utility model discloses an oil press prefill valve body structure which comprises an upper valve seat and a lower valve seat, a valve element is further installed between the upper valve seat and the lower valve seat, and a plurality of threaded counter bores are distributed on the surface of the lower valve seat on the outer side of the valve element. One end of a double-thread screw is screwed into the threaded counter bore in a threaded mode, a rod body of the double-thread screw penetrates through the through hole in the upper valve seat and then stretches into the upper portion of the threaded counter bore, a guide sleeve is connected to the portion, between the upper valve seat and the lower valve seat, of the double-thread screw in a sleeved mode, and the two ends of the guide sleeve are supported on the top face and the bottom face of the upper valve seat and the bottom face of the lower valve seat respectively. The end of the double-thread screw extending out of the upper portion of the upper valve seat is further in threaded connection with a locking nut. An original valve body structure is omitted, the upper flange piece and the lower flange piece are additionally designed, the four screws with double-end threads and the guide sleeve are adopted in the middle for connection and supporting, the area of an oil inlet hole and the area of an oil outlet hole are increased, the instantaneous oil inlet and outlet amount of the oil hole is increased, impact and vibration caused by too large oil inlet and outlet pressure in the punching process are reduced, and the service life of the oil inlet and outlet hole is prolonged. And the valve body is prevented from being damaged due to overlarge stress.

Description

Technical Field

[0001] The utility model relates to a valve body structure of a hydraulic press filling valve, belonging to the technical field of hydraulic press filling valves. Background Art

[0002] The hydraulic press filling valve is installed on the top of the main oil cylinder and immersed in the oil in the filling tank. When the slider moves downward quickly due to its own weight, negative pressure is formed inside the main cylinder, which opens the filling valve and causes a large amount of oil in the filling tank to flow into the cylinder. When the slider returns or when the press completes the pressing and pressure-maintaining actions, the control oil circuit is connected during the slider return process, pushing the control piston downward, first pushing open the small valve core, and then pushing open the main valve core of the filling valve, so that the oil in the upper chamber of the main cylinder is discharged back to the filling tank.

[0003] The valve body of the filling valve is an integral casting structure, and the filling valve body is provided with a long hole for filling and draining oil. Due to the small size of the hole, the instantaneous filling and draining of oil is insufficient, and the instantaneous oil pressure overload will occur during the stamping process, causing vibration impact on the valve body, which is easy to cause the valve body to break. In addition, the broken small fragments are easy to cause damage to other parts such as the valve core under the action of high-pressure oil. Utility Model Content

[0004] The purpose of the utility model is to provide a hydraulic press filling valve body structure. After improvement, the original filling valve body structure is removed, and a new replacement structure is designed and manufactured. The new valve body increases the area of ​​the oil inlet and outlet holes, increases the instantaneous oil inlet and outlet volume of the oil holes, so as to reduce the impact and vibration caused by excessive oil inlet and outlet pressure during the stamping process, and avoid damage to the valve body due to excessive force.

[0005] The technical solution of the utility model: a valve body structure of a hydraulic press filling valve, including an upper valve seat and a lower valve seat, a valve core is also installed between the upper valve seat and the lower valve seat, a plurality of threaded countersunk holes are arranged and distributed on the surface of the lower valve seat outside the valve core, one end of the double-headed screw is threaded into the threaded countersunk hole, and its rod body passes through the through hole on the upper valve seat and extends to the upper part thereof, a guide sleeve is sleeved on the double-headed screw between the upper valve seat and the lower valve seat, and the two ends of the guide sleeve are respectively supported on the top and bottom surfaces of the upper valve seat and the lower valve seat, and the end of the double-headed screw extending above the upper valve seat is also threadedly connected with a locking nut.

[0006] In the aforementioned hydraulic press filling valve body structure, the bottom surface of the upper valve seat and the top surface of the lower valve seat are each provided with an upper flange and a lower flange, and a large hole for the valve core to pass through is provided in the center of the upper flange and the lower flange, and a plurality of limiting holes are arranged on the edge thereof, and the double-headed screw passes through the limiting holes, and the two ends of the guide sleeve respectively abut against the bottom surface of the upper flange and the top surface of the lower flange.

[0007] In the aforementioned hydraulic press filling valve body structure, both ends of the guide sleeve are stepped structures, with small diameter structures at both ends and large diameter structure in the middle. The small diameter sections at both ends of the guide sleeve extend into the limit holes of the upper flange and the lower flange, and the step surfaces thereof respectively resist the bottom surface of the upper flange and the top surface of the lower flange.

[0008] In the aforementioned hydraulic press filling valve body structure, four double-headed screws are provided.

[0009] Beneficial effects of the utility model: Compared with the prior art, the utility model cancels the original valve body structure on the basis of the unchanged upper and lower valve seats and valve core of the original filling valve. An assembled valve body structure is adopted, that is, two upper and lower flanges are newly designed, and four screws and guide sleeves with double-threaded threads are used in the middle for connection and support. In the process of filling and returning oil, because there is no original valve body, the hydraulic oil inlet and outlet area is greatly increased, the instantaneous oil inlet and outlet volume of the oil hole is increased, and the impact and vibration caused by excessive oil inlet and outlet pressure during the stamping process are reduced, and the valve body is prevented from being damaged due to excessive force. The operation is more stable, and the pressure on the valve body during the stamping process is greatly reduced, and the vibration is reduced. In addition, the valve body has a simple structure, and is relatively convenient to install and disassemble. It can be repaired and maintained by itself when damaged, and there is no need to purchase accessories from the original factory, which greatly reduces maintenance time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model;

[0011] Figure 2 for Figure 1 A schematic diagram of a top view structure;

[0012] Figure 3 It is a structural schematic diagram of the guide sleeve.

[0013] Figure 4 It is a structural schematic diagram of the upper and lower flanges.

[0014] Figure markings: 1-upper valve seat, 2-lower valve seat, 3-valve core, 4-double-headed screw, 5-guide sleeve, 6-locking nut, 7-upper flange, 8-lower flange, 9-limiting hole. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0016] Embodiment of the utility model: a valve body structure of a hydraulic press filling valve, such as Figure 1-4As shown, it includes an upper valve seat 1 and a lower valve seat 2, and a valve core 3 is installed between the upper valve seat 1 and the lower valve seat 2. A plurality of threaded countersunk holes are arranged on the surface of the lower valve seat 2 outside the valve core 3. One end of the double-headed screw 4 is threaded into the threaded countersunk hole, and its rod body passes through the through hole on the upper valve seat 1 and extends into the upper part thereof. The upper valve seat 1 is provided with through holes whose number and position match the threaded countersunk holes. A guide sleeve 5 is sleeved on the double-headed screw 4 between the upper valve seat 1 and the lower valve seat 2, and both ends of the guide sleeve 5 are respectively supported on the top and bottom surfaces of the upper valve seat 1 and the lower valve seat 2, and the end of the double-headed screw 4 extending above the upper valve seat 1 is also threadedly connected with a locking nut 6.

[0017] The utility model cancels the original valve body structure on the basis of the original liquid filling valve upper valve seat 1, lower valve seat 2, and valve core 3 remain unchanged. The assembled valve body structure is adopted, that is, the double-headed screw 4 and guide sleeve 5 are newly designed for connection and support, the upper valve seat 1 is supported by the guide sleeve 5, the connection between the upper valve seat 1 and the lower valve seat 2 is achieved by the double-headed screw 4, and the upper valve seat 1 is locked and fixed by the locking nut 6, so as to ensure the stability of the overall structure. In the utility model, since only a few guide sleeves 5 are left between the upper valve seat 1 and the lower valve seat 2 for support, during the process of filling and returning oil, because there is no original valve body, the hydraulic oil inlet and outlet area is greatly increased, and the operation is more stable.

[0018] The bottom surface of the upper valve seat 1 and the top surface of the lower valve seat 2 are each movably provided with an upper flange 7 and a lower flange 8. The center of the upper flange 7 and the lower flange 8 is provided with a large hole for the valve core 3 to pass through, and a plurality of limiting holes 9 are arranged on the edge thereof. The double-headed screw 4 passes through the limiting holes 9 to realize the movable sleeve connection of the upper flange 7, the lower flange 8 and the double-headed screw 4. The two ends of the guide sleeve 5 respectively abut against the bottom surface of the upper flange 7 and the top surface of the lower flange 8. Under the locking action of the locking nut 6, the top surface of the upper flange 7 abuts against the bottom of the upper valve seat 1, and the bottom surface of the lower flange 8 abuts against the surface of the lower valve seat 2. The limiting holes 9 on the upper flange 7 and the lower flange 8 are used to limit the double-headed screw 4, thereby ensuring the stability of the entire structure. In the entire structure, the guide sleeve 5 only plays a supporting role for the upper flange 7 and the lower flange 8 to ensure the distance between the bottom surface of the upper valve seat 1 and the lower valve seat 2.

[0019] Both ends of the guide sleeve 5 are stepped structures, with small diameter structures at both ends and large diameter structures in the middle. The small diameter sections at both ends of the guide sleeve 5 extend into the limiting holes 9 of the upper flange 7 and the lower flange 8, and the step surfaces thereof respectively abut against the bottom surface of the upper flange 7 and the top surface of the lower flange 8. The two ends of the guide sleeve 5 extend into the limiting holes 9 to limit the guide sleeve 5, thereby preventing it from shaking and affecting the structural stability. At the same time, by using the step surfaces to abut against the bottom surface of the upper flange 7 and the top surface of the lower flange 8 respectively, a better support effect can be achieved for the upper valve seat 1 and the lower valve seat 2.

[0020] There are four double-headed screws 4, which well realize the connection between the upper valve seat 1 and the lower valve seat 2 and ensure the stability of the overall structure.

[0021] The valve body of the utility model adopts a flange-screw-guide sleeve structure. Compared with the original cast one-piece valve body structure, the area of ​​the oil inlet and outlet holes is increased by nearly 1.5 times, which basically solves the problem of excessive instantaneous pressure and reduces vibration. In addition, the guide sleeve 5 structure is adopted to improve maintainability. That is, when a double-headed screw 4 is loose, it is only necessary to tighten or replace the double-headed screw 4 alone during maintenance, and there is no need to disassemble all the double-headed screws 4 of the valve body. The valve body has a simple structure and is relatively convenient to install and disassemble. It can be repaired and maintained by itself when damaged, without the need to purchase accessories from the original factory, which greatly reduces maintenance time and cost.

Claims

1. A valve body structure of a hydraulic press filling valve, comprising an upper valve seat (1) and a lower valve seat (2), wherein a valve core (3) is installed between the upper valve seat (1) and the lower valve seat (2), characterized in that: The surface of the lower valve seat (2) outside the valve core (3) is provided with a plurality of threaded countersunk holes, one end of the double-headed screw (4) is threadedly screwed into the threaded countersunk hole, and the rod thereof passes through the through hole on the upper valve seat (1) and extends into the upper part thereof. A guide sleeve (5) is sleeved on the double-headed screw (4) between the upper valve seat (1) and the lower valve seat (2), and the two ends of the guide sleeve (5) are respectively supported on the top and bottom surfaces of the upper valve seat (1) and the lower valve seat (2), and the end of the double-headed screw (4) extending above the upper valve seat (1) is also threadedly connected with a locking nut (6).

2. The valve body structure of a hydraulic press filling valve according to claim 1, characterized in that: The bottom surface of the upper valve seat (1) and the top surface of the lower valve seat (2) are each provided with an upper flange (7) and a lower flange (8). A large hole for the valve core (3) to pass through is provided in the center of the upper flange (7) and the lower flange (8). A plurality of limiting holes (9) are arranged on the edge thereof. The double-headed screw (4) passes through the limiting holes (9). The two ends of the guide sleeve (5) respectively abut against the bottom surface of the upper flange (7) and the top surface of the lower flange (8).

3. The valve body structure of a hydraulic press filling valve according to claim 2, characterized in that: Both ends of the guide sleeve (5) are stepped structures, with the two ends being small-diameter structures and the middle being large-diameter structures. The small-diameter sections at both ends of the guide sleeve (5) extend into the limiting holes (9) of the upper flange (7) and the lower flange (8), and the stepped surfaces thereof respectively abut against the bottom surface of the upper flange (7) and the top surface of the lower flange (8).

4. The valve body structure of a hydraulic press filling valve according to claim 1, characterized in that: Four double-headed screws (4) are provided.

Images