Pre-unloading valve rod with high tensile strength

Abstract

The utility model relates to the technical field of hydraulic equipment, and discloses a high-tensile pre-unloading valve rod which comprises a prefill valve body, an installation groove is formed in the upper surface of the prefill valve body, the pre-unloading valve rod is arranged in the installation groove, and a movable valve element is fixedly installed at the bottom end of the pre-unloading valve rod. And the inner wall of the mounting groove is fixedly connected with a positioning seat. The positioning sleeve is arranged on the surface of the pre-unloading valve rod, and the first buffering thread and the second buffering thread are respectively arranged on the surface of the positioning sleeve of the pre-unloading valve rod box, so that the positioning sleeve can be in threaded connection with the top of the pre-unloading valve rod; the pre-unloading valve rod drives the positioning sleeve to move downwards, then impact force generated when the positioning sleeve collides with the positioning seat is dispersed to the threaded surface on the pre-unloading valve rod, the tensile strength of the pre-unloading valve rod is improved through the structure, and valve element falling caused by breakage of the pre-unloading valve rod is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, and more specifically to a high-tensile-resistance pre-unloading valve stem. Background Art

[0002] Pre-pressure relief filling valves are used in fast forging machines and are mainly imported. There is an urgent need for domestic replacements. At present, when the pre-unloading valve stem of the domestic filling valve opens at high speed for self-priming, the valve stem inside the valve is subjected to a certain pulling force when the filling valve is self-priming. Under the action of the pulling force, the valve stem is prone to cracks and breakage, causing the valve core to separate from the valve body and fall into the oil cylinder, causing damage to the oil cylinder.

[0003] To this end, we designed a high-tensile pre-release valve stem to improve the tensile strength of the valve stem and significantly reduce the valve core from falling off due to valve stem breakage. Second, the liquid filling device used in the fast forging machine provides reliable pressure-maintaining performance. Third, the structure is simple, which reduces the difficulty of production and manufacturing and is conducive to mass production. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a pre-release valve stem with high tensile strength, which has the advantages of simple structure and high pressure-maintaining performance, so as to solve the problems existing in the above-mentioned background technology.

[0005] The utility model provides the following technical solution: a high-tensile pre-release valve stem, comprising a filling valve body, an upper surface of which is provided with a mounting groove, a pre-release valve stem is arranged inside the mounting groove, and a movable valve core is fixedly installed at the bottom end of the pre-release valve stem;

[0006] The inner wall of the installation groove is fixedly connected with a positioning seat, the positioning seat is a sleeve-shaped structure, the pre-relief valve stem is inserted and installed inside the positioning seat, and the pre-relief valve stem is slidably connected to the inner wall of the positioning seat;

[0007] A plurality of first buffer threads are fixedly provided on the surface of the pre-relief valve stem, the first buffer threads are close to the top of the pre-relief valve stem, a positioning sleeve is provided on the top of the pre-relief valve stem, a plurality of second buffer threads are fixedly provided on the inner wall of the positioning sleeve, the first buffer threads match the second buffer threads, the positioning sleeve is threadedly connected to the surface of the pre-relief valve stem, and the positioning seat is used to limit the positioning sleeve.

[0008] Furthermore, the positioning sleeve is composed of a limiting nut and an upper and lower part of a limiting sleeve.

[0009] Furthermore, a compression spring is sleeved on the surface of the pre-relief valve stem, the top end of the compression spring is fixedly connected to the lower surface of the limiting sleeve, and the bottom end of the compression spring is fixedly connected to the surface of the positioning seat.

[0010] Furthermore, a limiting groove is provided on the inner wall of the limiting groove, a limiting top ring is fixedly provided on the inner wall of the limiting groove, and a wire retaining ring is installed between the limiting top ring and the first buffer thread.

[0011] Furthermore, the wire retaining ring and the limiting top ring are used to fix the positioning sleeve tightly against the surface of the pre-relief valve stem.

[0012] Furthermore, the compression spring is used to automatically reset the pre-relief valve stem.

[0013] Technical effects and advantages of the utility model:

[0014] The utility model provides a positioning sleeve on the surface of the pre-relief valve stem, and respectively provides a first buffer thread and a second buffer thread on the surface of the pre-relief valve stem and inside the positioning sleeve, so that the positioning sleeve can be threadedly connected to the top of the pre-relief valve stem. When the pre-relief valve stem is subjected to tension during self-priming of the filling valve, the pre-relief valve stem drives the positioning sleeve to move downward, thereby dispersing the impact force generated by the positioning sleeve hitting the positioning seat to the threaded surface of the pre-relief valve stem. This structure improves the tensile strength of the pre-relief valve stem and greatly reduces the falling off of the valve core caused by the breakage of the pre-relief valve stem. Therefore, under the condition of equal impact force, the tensile fatigue life of the pre-relief valve stem is longer than that of the traditional structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the front section structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the pre-release valve stem structure of the utility model;

[0018] Figure 4 for Figure 2 Enlarged structural diagram at A in the middle.

[0019] The accompanying drawings are marked as follows: 1. valve body of the filling valve; 2. movable valve core; 3. compression spring; 4. pre-discharge valve stem; 5. positioning seat; 6. positioning sleeve; 7. steel wire retaining ring;

[0020] 401, first buffer thread;

[0021] 601, second buffer thread; 602, limiting top ring; 603, limiting groove; 604, limiting nut; 605, limiting sleeve. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the high-tensile pre-relief valve stem involved in the present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0023] Reference Figure 1-4 The utility model provides a high-tensile pre-release valve stem 4, comprising a filling valve body 1, a mounting groove is provided on the upper surface of the filling valve body 1, a pre-release valve stem 4 is provided inside the mounting groove, and a movable valve core 2 is fixedly installed at the bottom end of the pre-release valve stem 4;

[0024] The inner wall of the installation groove is fixedly connected with a positioning seat 5, the positioning seat 5 is a sleeve-shaped structure, the pre-unloading valve stem 4 is inserted and installed inside the positioning seat 5, and the pre-unloading valve stem 4 is slidably connected with the inner wall of the positioning seat 5;

[0025] A plurality of first buffer threads 401 are fixedly arranged on the surface of the pre-relief valve stem 4, and the first buffer threads 401 are close to the top of the pre-relief valve stem 4. A positioning sleeve 6 is sleeved on the top of the pre-relief valve stem 4, and the positioning sleeve 6 is composed of an upper and lower part of a limit nut 604 and a limit sleeve 605.

[0026] It is worth noting that by providing a positioning sleeve 6 on the surface of the pre-relief valve stem 4, and providing a first buffer thread 401 and a second buffer thread 601 on the surface of the pre-relief valve stem 4 and inside the positioning sleeve 6 respectively, the positioning sleeve 6 can be threadedly connected to the top of the pre-relief valve stem 4. When the pre-relief valve stem 4 is subjected to tension when the filling valve is self-priming, this structure improves the tensile strength of the valve stem and greatly reduces the valve core falling off caused by valve stem breakage.

[0027] A limiting groove 603 is provided on the inner wall of the limiting groove 603, and a limiting top ring 602 is fixedly arranged on the inner wall of the limiting groove 603. A wire retaining ring 7 is installed between the limiting top ring 602 and the first buffer thread 401. The wire retaining ring 7 and the limiting top ring 602 are used to fix the positioning sleeve 6 tightly against the surface of the pre-relief valve stem 4.

[0028] A compression spring 3 is sleeved on the surface of the pre-relief valve stem 4, the top end of the compression spring 3 is fixedly connected to the lower surface of the limit sleeve 605, and the bottom end of the compression spring 3 is fixedly connected to the surface of the positioning seat 5, and the compression spring 3 is used to automatically reset the pre-relief valve stem 4.

[0029] The inner wall of the positioning sleeve 6 is fixedly provided with a plurality of second buffer threads 601 , the first buffer threads 401 and the second buffer threads 601 match each other, the positioning sleeve 6 is threadedly connected to the surface of the pre-unloading valve stem 4 , and the positioning seat 5 is used to limit the positioning sleeve 6 .

[0030] When the pre-release valve stem 4 is subjected to tension during the self-priming of the filling valve, the pre-release valve stem 4 drives the positioning sleeve 6 to move downward, and then disperses the impact force generated by the positioning sleeve 6 hitting the positioning seat 5 to the first buffer thread 401 on the pre-release valve stem 4 and the second buffer thread 601 surface on the inner wall of the positioning sleeve 6. This structure improves the tensile strength of the pre-release valve stem 4 and greatly reduces the valve core falling off caused by the breakage of the pre-release valve stem 4. Therefore, under the same impact force, the tensile fatigue life of the pre-release valve stem 4 is longer than that of the traditional structure. At the same time, the pre-release valve stem 4 structure is used in the filling device of the fast forging machine tool, providing reliable pressure-maintaining performance. In addition, the valve stem structure is simple, which reduces the difficulty of production and manufacturing, and is conducive to mass production.

[0031] The installation steps of the pre-relief valve stem 4 are specifically as follows: first, screw the positioning sleeve 6 as a whole into the bottom of the first buffer thread 401 on the pre-relief valve stem 4, and then insert the wire retaining ring 7 into the second buffer thread 601 groove on the pre-relief valve stem 4, and then reversely rotate the positioning sleeve 6 out of the limiting groove 603 of the limiting nut 604, and use the limiting top ring 602 in the limiting groove 603 to tighten and lock the wire retaining ring 7, so as to complete the installation of the overall structure of the pre-relief valve stem 4, pass the pre-relief valve stem 4 through the positioning seat 5, and limit the compression spring 3 between the positioning sleeve 6 and the positioning seat 5, the second buffer thread 601 of the positioning sleeve 6 is connected to the pre-relief valve stem 4, and install the wire retaining ring 7 at the valve stem groove to prevent loosening.

[0032] Working principle: When the high-speed forging machine tool descends rapidly, the machine tool cylinder generates a vacuum. Under the vacuum effect of the cylinder, the valve core is self-priming and opened, and the hydraulic oil flows from the oil tank through the filling valve to the cylinder. The pre-relief valve stem 4 is driven by the movable valve core 2 and the positioning sleeve 6 and the compression spring 3 to move downward rapidly. When the positioning sleeve 6 hits the positioning seat 5, a huge impact is generated and transmitted to the valve stem 4 through the first buffer thread 401 and the second buffer thread 601. Under the reaction force of the movable valve core 2 driving the pre-relief valve stem 4 downward, the positioning sleeve 6 generates a pulling force on the pre-relief valve stem 4 through the thread, and the pulling force is jointly borne by all the threads on the pre-relief valve stem 4. The force borne by the wire retaining ring 7 is also equivalent to the force of one thread in the positioning sleeve 6. The weakest part of the pre-relief valve stem 4 is the groove. Therefore, the pulling force of the wire retaining ring 7 on the valve stem groove is only the force of one thread. Compared with the traditional structure, there is no threaded limit stop column and retaining ring to generate pulling force on the valve stem groove. The mechanism of the present invention avoids the valve stem from cracking in the groove, and further breaking, which causes the movable valve core 2 to fall off from the filling valve body 1 and fall into the oil cylinder. At the same time, the wire retaining ring 7 is subjected to very little force, which prevents the positioning sleeve 6 from withdrawing from the pre-unloading valve stem 4, avoiding the occurrence of a gap between the movable valve core 2 and the valve body 1 of the filling valve, thereby affecting the pressure maintenance of the filling valve.

[0033] Finally, it should be noted that the drawings of the embodiments disclosed in the present utility model only involve structures related to the embodiments disclosed in the present utility model. The above description is only a preferred embodiment of the present utility model and is not used to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A high tensile strength pre-release valve stem, comprising a filling valve body (1), characterized in that: The upper surface of the filling valve body (1) is provided with a mounting groove, a pre-relief valve stem (4) is arranged inside the mounting groove, and a movable valve core (2) is fixedly mounted at the bottom end of the pre-relief valve stem (4); The inner wall of the installation groove is fixedly connected with a positioning seat (5), the positioning seat (5) is a sleeve-shaped structure, the pre-relief valve stem (4) is inserted and installed inside the positioning seat (5), and the pre-relief valve stem (4) is slidably connected to the inner wall of the positioning seat (5); A plurality of first buffer threads (401) are fixedly arranged on the surface of the pre-relief valve stem (4), the first buffer threads (401) are close to the top of the pre-relief valve stem (4), a positioning sleeve (6) is sleeved on the top of the pre-relief valve stem (4), a plurality of second buffer threads (601) are fixedly arranged on the inner wall of the positioning sleeve (6), the first buffer threads (401) and the second buffer threads (601) match each other, the positioning sleeve (6) is threadedly connected to the surface of the pre-relief valve stem (4), and the positioning seat (5) is used to limit the positioning sleeve (6).

2. The high tensile strength pre-release valve stem according to claim 1, characterized in that: The positioning sleeve (6) is composed of a limiting nut (604) and a limiting clamping sleeve (605), which are composed of an upper and a lower part.

3. The high tensile strength pre-release valve stem according to claim 2, characterized in that: The surface of the pre-relief valve stem (4) is sleeved with a compression spring (3), the top end of the compression spring (3) is fixedly connected to the lower surface of the limiting sleeve (605), and the bottom end of the compression spring (3) is fixedly connected to the surface of the positioning seat (5).

4. The high tensile strength pre-release valve stem according to claim 3, characterized in that: The inner wall of the limiting nut (604) is provided with a limiting groove (603), the inner wall of the limiting groove (603) is fixedly provided with a limiting top ring (602), and a wire retaining ring (7) is installed between the limiting top ring (602) and the first buffer thread (401).

5. The high tensile strength pre-release valve stem according to claim 4, characterized in that: The wire retaining ring (7) and the limiting top ring (602) are used to fix the positioning sleeve (6) tightly against the surface of the pre-relief valve stem (4).

6. The high tensile strength pre-release valve stem according to claim 5, characterized in that: The compression spring (3) is used to automatically reset the pre-release valve stem (4).

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