Anti-cracking valve ball for slurry delivery device one-way valve

Abstract

The utility model relates to a kind of valve ball for anti-cracking slurry conveying device check valve, belong to valve fittings technical field.The valve ball is hollow ball structure, including first half ball and second half ball, the butt joint end face of the first half ball and second half ball is respectively machined to form with the child-mother platform of mutual cooperation, the surface of the child-mother platform of both is respectively machined to form with thread, the child-mother platform of the first half ball and second half ball is fastened by thread connection.The two half balls of valve ball designed in the utility model are connected and fastened by thread, avoid the problem that the valve ball using process is prone to cracking in the interference assembly of traditional use temperature difference method.

Description

Technical Field

[0001] This utility model relates to the technical field of accessories for check valves used in slurry conveying devices, specifically to a valve ball for a check valve in a crack-resistant slurry conveying device. Background Technology

[0002] In the coal chemical production process, the coal slurry preparation section requires multiple plunger diaphragm pumps to form the discharge trough pumps of the coal mill. Their main function is to transport the qualified coal-water slurry ground by the coal mill from the "coal mill discharge trough" to the "coal slurry trough." The valve ball of the one-way valve used in the discharge trough pump is generally designed as a "hollow ball" structure, assembled from two hemispherical shells. Currently, the two hemispheres of the valve ball are cast separately, with a "mother-daughter platform" machined on the mating end faces of the two hemispheres, and then an interference fit is achieved using a temperature difference method. This assembly method has the following main drawbacks: the interference fit "mother-daughter platform" requires high tolerance and machining accuracy, and dimensional fit is prone to exceeding the deviation range. The two hemispheres, when heat-fitted, cannot achieve the required interference amount. As the surface of the valve ball gradually wears down, the valve ball increases in operation due to wear and increased clearance (including positioning and guidance), and the impact force and strength of the valve ball also increase accordingly. After a certain degree of wear, the valve ball will crack or even split into two halves. Summary of the Invention

[0003] To address the problems in the existing technology, this utility model patent designs a valve ball for a one-way valve of a slurry conveying device that is resistant to cracking, thereby solving the problem that valve balls using the existing temperature difference interference assembly method are prone to cracking during long-term use.

[0004] The technical solution adopted by this utility model is as follows: the valve ball is a hollow ball structure, including a first hemisphere and a second hemisphere. The mating end faces of the first hemisphere and the second hemisphere are respectively machined to form mutually cooperating concave and convex male and female platforms. The horizontal mating surfaces of the male and female platforms are respectively machined to form threads. The male and female platforms of the first hemisphere and the second hemisphere are fastened by threaded connection.

[0005] Furthermore, the outer facades of the first and second hemispheres have welding bevels along the joint, and the two are welded together along the welding bevels.

[0006] Furthermore, the inner facades of the first and second hemispheres are respectively machined into pre-tightening surfaces for the contact surfaces of the joints.

[0007] Furthermore, the threaded connection surfaces of the male and female platforms of the first and second hemispheres are coated with anti-loosening adhesive.

[0008] Compared to existing technologies, the advancement of this utility model patent in designing a crack-resistant check valve ball for a slurry conveying device lies in the following: the assembly method of the first and second hemispheres of the valve ball is changed from the traditional temperature difference interference connection to a threaded connection. This reduces the precision requirements for machining the mating terminals of the two hemispheres, simplifies machining, and, since the two hemispheres do not use an interference connection, they are not affected by the high-temperature environment during application, thus extending the service life of the valve ball. The first and second hemispheres are protected by a triple anti-loosening method, including threads, pre-tightening surfaces, and thread anti-loosening adhesive, ensuring the integrity of the assembled valve ball. Welding is performed along the welding bevel opened along the outer joint to fix the ball, solving problems such as valve ball cracking, splitting, and reduced operating cycle in the check valve of the coal mill discharge trough pump. This extends the equipment operating cycle, reduces unplanned shutdowns, eliminates operational hazards, and saves maintenance costs. Attached Figure Description

[0009] Figure 1 This is a cross-sectional schematic diagram of the valve ball used in a one-way valve of a crack-resistant slurry conveying device.

[0010] In the diagram, 1 is the first hemisphere, 2 is the second hemisphere, 3 is the mother-daughter platform, 4 is the thread, 5 is the pre-tightening surface, and 6 is the welding bevel. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0012] like Figure 1 As shown, this utility model patent designs an embodiment of a valve ball for a one-way valve of a crack-resistant slurry conveying device. In this embodiment, the valve ball is a hollow spherical structure. The spherical shell of the valve ball is assembled from a first hemisphere 1 and a second hemisphere 2. The mating end faces of the first hemisphere 1 and the second hemisphere 2 are respectively machined with mutually mating concave-convex male and female platforms 3, and threads 4 are respectively machined on the horizontal mating surfaces of the male and female platforms 3. The male and female platforms 3 of the first hemisphere 1 and the second hemisphere 2 are connected and fastened by the threads 4. Before connection, anti-loosening adhesive is applied to the threads 4 of the male and female platforms 3 of the first hemisphere 1 and the second hemisphere 2.

[0013] In addition, to achieve a better relaxation effect, the inner facades of the first hemisphere 1 and the second hemisphere 2 are respectively machined into pre-tightening surfaces 5 at the joint. The outer facades of the first hemisphere 1 and the second hemisphere 2 are respectively provided with welding bevels 6 along the joint, and the two are welded and fixed along the welding bevels.

[0014] This utility model patent discloses a valve ball for a one-way valve of a crack-resistant slurry conveying device. First, the mating ends of the two hemispheres are respectively machined into concave-convex male and female platforms 3 that can cooperate with each other. Then, connecting threads are machined on the horizontal mating surfaces of the two male and female platforms 3 according to a certain tooth angle (to achieve better self-locking). The inner mating end faces of the male and female platforms 3 are machined into contact pre-tightening surfaces 5 of the two hemispheres (the two hemispheres of the valve ball are fastened by threaded connection, and the end faces of the male and female platforms 3 contact and press tightly to prevent loosening). During the connection of the two hemispheres, anti-loosening glue can be added to the threads 4 to further achieve the purpose of preventing loosening. After the valve ball is connected, a suitable welding bevel 6 is machined along the outer joint. The entire assembly is welded along the welding bevel 5, and the outer surface of the valve ball is ground round and precision machined.

[0015] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A valve ball for a one-way valve in a crack-resistant slurry conveying device, characterized in that, The valve ball is a hollow ball structure, including a first hemisphere and a second hemisphere. The mating end faces of the first hemisphere and the second hemisphere are respectively machined to form mutually mating concave and convex male and female platforms. The horizontal mating surfaces of the male and female platforms are respectively machined to form threads. The male and female platforms of the first hemisphere and the second hemisphere are fastened together by the threaded connection.

2. The valve ball for the one-way valve of the anti-cracking slurry conveying device according to claim 1, characterized in that, The outer facades of the first and second hemispheres have welding bevels along the joint, and the two are welded together along the welding bevels.

3. The valve ball for the one-way valve of the anti-cracking slurry conveying device according to claim 2, characterized in that, The inner facades of the first and second hemispheres are respectively machined into pre-tightening surfaces for the contact surfaces of the joints.

4. The valve ball for the one-way valve of the anti-cracking slurry conveying device according to claim 3, characterized in that, The threaded connection surfaces of the first and second hemispheres are coated with anti-loosening adhesive.

Images