Maintenance-free air chamber and preparation process and device thereof

Abstract

The invention discloses a maintenance-free air chamber and a preparation process and device thereof, and belongs to the technical field of slurry pumps. The maintenance-free air chamber comprises a shell, a buffer inner container, a buffer block and a flange cover. An annular groove is formed in the buffering inner container, a groove is formed in the bottom of the buffering inner container, the outer wall of the buffering inner container is in a drum shape, and a spiral channel is formed in a damping hole of the buffering inner container. The spiral channel is formed in the damping hole, when fluid flows through the channel, the fluid is forced to move along the spiral track, the remarkable centrifugal force and the secondary flow effect are generated, the scouring effect on the hole wall is enhanced, self-cleaning is achieved through fluid power, and the blocking risk is reduced; and meanwhile, fluid turbulence destroys impurity attachment, blockage is prevented, the probability that the damping holes are blocked is reduced, and the maintenance frequency of the air chamber is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the field of mud pumps, in particular to a maintenance-free air pack and a preparation process and device thereof. BACKGROUND

[0002] The air pack is a key auxiliary device in reciprocating fluid machines such as mud pumps, concrete pumps and diaphragm pumps, and can absorb periodic pressure pulsations generated in the pumping process through the elastic deformation of the buffer inner container, so as to stabilize the displacement and effectively protect the pump body.

[0003] The buffer inner container of the existing air pack is usually made of high-elastic rubber material (such as nitrile rubber NBR, hydrogenated nitrile rubber HNBR or fluororubber FKM) through a mold pressing vulcanization process; in actual use, under the working condition of high sand content and many impurities (such as mud pump operation), solid particles, colloid or precipitates in the mud are easy to enter and block the damping holes, destroy the dynamic balance of the inner and outer pressures of the inner container, and cause frequent maintenance; in addition, the buffer inner container is subjected to uneven stress during work, and local stress concentration is easy to occur, resulting in short service life of the buffer inner container, frequent replacement and high maintenance cost. During the preparation of the buffer inner container, due to the setting of the damping holes, there are protruding areas on the mold in the damping holes of the buffer inner container, and the traditional way is to use a simple ejector pin or manual prying method for demolding, which is easy to cause damage to the buffer inner container and affect its service life. SUMMARY

[0004] The application aims to provide a maintenance-free air pack and a preparation process and device thereof, which solve the problems existing in the buffer inner container of the existing air pack.

[0005] The application achieves the above-mentioned purpose through the following technical scheme: a maintenance-free air pack, comprising a shell, a buffer inner container, a buffer block and a flange cover. The buffer inner container is provided with an annular groove, the bottom of the buffer inner container is provided with a groove, the outer wall of the buffer inner container is drum-shaped, and the damping hole of the buffer inner container is provided with a spiral channel.

[0006] Preferably, the annular grooves are arranged on the inner side wall of the buffer inner container in a spaced manner from top to bottom.

[0007] Preferably, the maximum inclination angle of the outer wall of the buffer inner container is 15-25°.

[0008] Preferably, a preparation device of a maintenance-free air pack is used for processing the buffer inner container of the maintenance-free air pack, and comprises a vulcanization equipment main body and an upper mold and a lower mold arranged on the vulcanization equipment main body. The lower mold comprises two sub-molds and a driving member for driving the two sub-molds to move close to or away from each other. The upper mold comprises a mold body, an annular protrusion detachably arranged on the mold body, and a protrusion movably arranged on the mold body.

[0009] Preferably, a mounting hole is arranged on the side wall of the mold body, the protrusion is slidably arranged in the mounting hole, a gas guide hole is arranged on the mold body, and a first channel is arranged on the mold body for connecting the gas guide hole and the mounting hole.

[0010] Preferably, the protrusion comprises a moving block, an insertion block, and a magnetic block arranged on the moving block and the insertion block, an opening is arranged on the moving block, a limiting insertion block and a spring member connected with the limiting insertion block are slidably arranged in the opening, and an insertion slot is arranged on the insertion block.

[0011] Preferably, a mark block is arranged on the insertion block.

[0012] Preferably, the annular protrusion is sleeved on the outer wall of the mold body, a fixing slot is arranged on the inner wall of the annular protrusion, a mounting slot is arranged on the outer side wall of the mold body, a fixing block for being inserted into the fixing slot and an elastic member connected with the fixing block are slidably arranged in the mounting slot, and the mounting slot is connected with the gas guide hole through a second channel.

[0013] Preferably, the annular protrusion comprises two arc-shaped blocks, a first connecting block is arranged at one end of the arc-shaped block, and a second connecting block is arranged at the other end of the arc-shaped block.

[0014] Preferably, a preparation process of the maintenance-free air bag utilizes the preparation device of the maintenance-free air bag, and comprises the following steps: S1: placing raw materials into a cavity of a lower mold, moving an upper mold downward to combine with the lower mold, pressurizing the raw materials, and preparing a buffer inner container; S2: after a preset time, a driving member drives two sub-molds to move apart, the outer part of the formed buffer inner container is demolded, the annular protrusion is disconnected from the mold body, and the protrusion is moved, so that the formed buffer inner container is separated from the upper mold; S3: after placing a buffer block in the interior of the buffer inner container, the buffer inner container is installed into a shell, a flange cover is connected with the shell, and the air bag is assembled.

[0015] The present application has the following advantages: 1. By setting a spiral channel in the damping hole, when the fluid (mud or liquid) flows through the channel, it is forced to move along a spiral trajectory, generating significant centrifugal force and secondary flow (vortex) effect, enhancing the scouring effect on the hole wall, using fluid power to achieve self-cleaning, reducing the risk of blockage, spiral through which impurities move outward under the action of centrifugal force, while fluid turbulence destroys impurities attachment, preventing blockage, reducing the probability of blockage of the damping hole, reducing the frequency of air bag maintenance; 2. The outer wall of the buffer liner is changed to an arc shape, which is approximately elliptical or spherical, so that the circumferential and axial stress distribution of the buffer liner is more uniform during pressure charging and pressure relief, effectively avoiding stress concentration at the neck, transition zone and other parts. A plurality of annular grooves are formed in the inner side wall of the buffer liner, and a recess is formed in the bottom wall of the buffer liner, so that the buffer liner produces uniform elastic deformation and releases local stress, preventing wrinkles, delamination or crack initiation, so that the fatigue life of the buffer liner is longer and the frequency of air bag maintenance and replacement is reduced; 3. The driving member drives the split module to move, so that the lower mold is divided into two parts, the wrapping constraint of the buffer liner outer wall is released, and stress-free demolding of complex curved surface structures such as approximately elliptical or spherical shapes is realized. The annular protrusion is fixed and the protrusion is moved, the upper mold external protrusion is removed, the buffer liner is conveniently taken down, the whole process does not need manual prying or forced traction, significantly reducing the risk of product surface scratches, edge tears, structural deformation and other defects, prolonging its service life. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure of the maintenance-free air bag of the present application is shown in the figure; Figure 2 The structure of the buffer liner of the present application is shown in the figure; Figure 3 The structure of the preparation device of the present application is shown in the figure; Figure 4 The structure of the mold body of the present application is shown in the figure; Figure 5 The structure of the present application Figure 4 The structure of the present application is shown in the figure; Figure 6 The structure of the present application is shown in the figure; Figure 7 The structure of the present application is shown in the figure; Figure 8 The structure of the present application is shown in the figure.

[0017] In the figure: 1, shell; 2, buffer inner container; 201, groove; 202, annular groove; 3, buffer block; 4, flange cover; 5, vulcanization equipment main body; 6, upper mold; 601, mold body; 7, lower mold; 701, mold dividing block; 702, driving piece; 8, annular protrusion; 801, arc block; 802, slot; 803, first connecting block; 804, second connecting block; 9, protrusion; 901, moving block; 902, insertion block; 903, magnetic block; 904, limiting insertion block; 905, spring piece; 906, insertion slot; 907, opening; 908, marker block; 10, mounting hole; 11, first channel; 12, air guide hole; 13, mounting slot; 14, fixing block; 15, fixing slot; 16, elastic piece; 17, second channel. DETAILED DESCRIPTION

[0018] The following further describes the present application in conjunction with the drawings. It is necessary to point out that the following detailed description is only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0019] Embodiment 1 Please refer to Figure 1 and Figure 2 A maintenance-free air bag, comprising: a shell 1, a buffer inner container 2, a buffer block 3, and a flange cover 4; the inner side wall of the buffer inner container 2 is provided with an annular groove 202, the bottom of the buffer inner container 2 is provided with a groove 201, the outer wall of the buffer inner container 2 is drum-shaped, and the inner wall of the damping hole of the buffer inner container 2 is provided with a spiral channel.

[0020] In this embodiment, as a further optimized scheme, please refer to Figure 1 and Figure 2 The annular groove 202 has a plurality of annular grooves 202, and the plurality of annular grooves 202 are sequentially and spaced apart from top to bottom on the inner side wall of the buffer inner container 2; the maximum inclination angle of the outer wall of the buffer inner container 2 is 15°-25°.

[0021] It should be noted that when the fluid (mud or liquid) flows through the spiral channel of the damping hole, it is forced to move along the spiral track, generating significant centrifugal force and secondary flow (vortex) effect, achieving self-cleaning by lengthening the fluid path and increasing the turbulence intensity, reducing the probability of damping hole blockage, reducing the frequency of air bag maintenance, and achieving the effect of maintenance-free. Through the setting of the groove 201, the annular groove 202, and the drum-shaped outer wall of the buffer inner container 2, the buffer inner container 2 is more balanced when it is extruded, and there is no stress concentration point, so that the fatigue life of the buffer inner container 2 is longer, and the frequency of maintenance and replacement is reduced; the shell 1 is ellipsoidal, combined with the cylindrical buffer inner container 2, reducing the fluid impact force, reducing the stress concentration of the inner container, and reducing the frequency of air bag maintenance.

[0022] Embodiment 2 As a further optimized solution of Embodiment 1, please refer to Figure 3 A device for preparing a maintenance-free air bag, which is used for processing the buffer inner container 2 in the air bag, comprising: a vulcanization equipment body 5, and an upper mold 6 and a lower mold 7 arranged on the vulcanization equipment body 5.

[0023] It should be noted that the vulcanization equipment body 5 is also provided with a heating system (such as an electric heating rod (heating pipe): inserted into a heating hole of the mold, providing heat required for vulcanization), an exhaust groove (a small groove opened at a parting surface or an edge of a cavity, which is used for discharging air, water vapor and low-molecular volatile substances in the rubber compound at the initial stage of vulcanization, preventing the product from generating bubbles, lack of glue and other defects), and other components. The vulcanization mold equipment belongs to the prior art, and will not be described in detail here.

[0024] As shown in Figure 3 The lower mold 7 comprises two mold blocks 701 and two driving members 702 (such as hydraulic cylinders), and the moving ends of the driving members 702 are connected with the mold blocks 701, which are used for driving the two mold blocks 701 to move close to or away from each other. The cavity inside the lower mold 7 is drum-shaped, which matches the shape of the outer wall of the buffer inner container 2.

[0025] As shown in Figure 4 The upper mold 6 comprises a mold body 601, and an annular protrusion 8 and a protrusion 9 arranged on the mold body 601. The annular protrusion 8 is used for forming an annular groove 202 inside the buffer inner container 2, and the protrusion 9 is used for forming a damping hole with a spiral channel on the buffer inner container 2. As shown in Figure 4 and Figure 5 A plurality of mounting holes 10 are arranged on the outer side wall of the mold body 601, the protrusion 9 is slidingly arranged in the inner cavity of the mounting hole 10, a gas guide hole 12 is arranged on the mold body 601, the gas guide hole 12 is connected with an external gas injection and exhaust device (such as a gas pump), a first channel 11 is arranged on the mold body 601, and the gas guide hole 12 and the mounting hole 10 are communicated through the first channel 11. As shown in Figure 4 and Figure 5 The annular protrusion 8 is sleeved on the outer wall of the mold body 601, a fixing groove 15 is arranged on the inner side wall of the annular protrusion 8, a mounting groove 13 is arranged on the outer side wall of the mold body 601, a fixing block 14 is slidingly arranged in the inner cavity of the mounting groove 13, one end of the fixing block 14 away from the mold body 601 is inserted into the fixing groove 15, and the fixing block 14 is used for fixing the annular protrusion 8 on the outer wall of the mold body 601. An elastic member 16 (such as a spring) is arranged between the mounting groove 13 and the fixing block 14, the spring provides a supporting force to the fixing block 14, so that the fixing block 14 is inserted into the fixing groove 15, and the mounting groove 13 is communicated with the gas guide hole 12 through a second channel 17. In order to avoid the first channel 11 and the second channel 17 interfering with each other, the gas guide hole 12 is separated into two parts, and the two parts are respectively communicated with two gas pumps.

[0026] The method for preparing the buffer liner 2 by using the preparation device is as follows: Firstly, raw materials are selected, the upper and lower molds are heated to a preset vulcanization temperature (usually between 150℃-180℃ according to the formula of the rubber material), and tools such as air guns and cotton cloths are used to clean the mold cavity thoroughly to ensure that there is no dust, oil stains or flash left over from the previous production, and then the mold cavity is uniformly sprayed or wiped with a release agent (so that the product can be smoothly demolded after vulcanization); Secondly, the raw materials are placed into the cavity of the lower mold 7, the vulcanization equipment main body 5 is started, the upper mold 6 is lowered, and the mold is quickly closed (the machine applies high pressure to the raw materials, forcing the rubber material to flow, filling every corner of the cavity, excluding air contained in the rubber material, preventing the product from producing defects such as bubbles and bright scars, and ensuring that the rubber is tightly attached to the metal insert and the mold cavity under high pressure, ensuring accurate size and firm bonding), after the mold is closed, the air pump injects air into the installation hole 10 through the air guide hole 12, increases the internal air pressure of the installation hole 10, and pushes the protrusion 9 to move to the outside of the installation hole 10, forming a protrusion on the outside of the mold body 601 (so that the prepared buffer liner 2 has a damping hole), and the buffer liner 2 is prepared; It should be noted that the raw materials are semi-finished products that have been uniformly mixed with vulcanizing agents in advance (the raw materials are processed by mixing during the preparation process, which belongs to the prior art and will not be described in detail); the raw materials are weighed and pre-formed according to the weight requirements of the product, and are usually pressed into a blank similar in shape to the mold cavity, such as a cylindrical or ring shape, which helps the rubber material to quickly and uniformly fill the cavity.

[0027] Thirdly, after a preset time, demolding is started, the driving part 702 drives the two mold blocks 701 to move apart, the molded buffer liner 2 is demolded from the outside, the air pump draws air through the air guide hole 12, generates negative pressure in the installation groove 13 and the installation hole 10, pulls the fixing block 14 to move to the inside of the installation groove 13, and the protrusion 9 moves to the inside of the installation hole 10, eliminating the protrusion area on the outside of the mold body 601, and disconnecting the ring-shaped protrusion 8 from the mold body 601, so that the buffer liner 2 can be pulled down from the upper mold 6; Fourthly, after the prepared buffer liner 2 is cooled and trimmed, the required buffer liner 2 is obtained.

[0028] In this embodiment, as a further optimized scheme, please refer to Figure 4 、 Figure 5 and Figure 6The protrusion 9 includes a movable block 901 and an insert block 902. The outer wall of the insert block 902 has a spiral protrusion, which creates a spiral channel inside the damping hole of the buffer liner 2 after processing. Magnets 903 are provided on the sides of the movable block 901 and the insert block 902 that are close to each other. The magnetic poles of the two magnets 903 are opposite on the sides that are close to each other, and they generate an attraction force to attract the insert block 902 onto the movable block 901. The side wall of the movable block 901 fits tightly against the inner wall of the mounting hole 10 (a sealing ring can be fitted on the outer wall of the movable block 901) to prevent gas leakage inside the mounting hole 10. An opening 907 is provided through the side wall of the movable block 901 facing the insert block 902. A limiting insert 904 is slidably provided in the inner cavity of the opening 907 (the outer wall of the limiting insert 904 fits tightly against the inner wall of the opening 907, so that no gap is generated between them). Gas is supplied through the opening 907. A spring 905 is provided between the opening 907 and the limiting plug 904. The plug 902 has a slot 906 on the side wall facing the moving block 901. When the air pressure inside the mounting hole 10 increases, the moving block 901 moves the plug 902 to the outside of the mounting hole 10. The external air pressure will also squeeze the limiting plug 904 into the cavity of the slot 906, so that the plug 902 will not fall down when it moves to the outside of the mounting hole 10. When it is necessary to pull the protrusion 9 back into the mounting hole 10, if the plug 902 is stuck in the damping hole of the buffer liner 2, the air pressure inside the mounting hole 10 will decrease, which will separate the moving block 901 from the plug 902 and separate the plug 902 from the mold body 601. This will not affect the normal demolding of the buffer liner 2. After demolding, the plug 902 will be removed from the inside of the damping hole.

[0029] It should be noted that the diameter of the insert 902 is smaller than the diameter of the moving block 901, and there is a gap between the insert 902 and the mounting hole 10.

[0030] In this embodiment, as a further optimization, please refer to... Figure 6 The plug 902 is provided with a marking block 908, which is used to mark each plug 902 to distinguish each plug 902, so as to facilitate the later installation of each plug 902 into the corresponding mounting hole 10.

[0031] In this embodiment, as a further optimization, please refer to... Figure 7 and Figure 8 The annular protrusion 8 includes two arc-shaped blocks 801. One end of each arc-shaped block 801 has a slot 802, and the other end has a first connecting block 803. A second connecting block 804 is located within the slot 802. The first connecting block 803 and the second connecting block 804 are L-shaped. The two arc-shaped blocks 801 face each other, and their ends fit together. The first connecting block 803 enters the inner cavity of the slot 802 and hooks with the second connecting block 804, so that the two arc-shaped blocks 801 can only be horizontally offset and separated (to...Figure 7 For example, the left arc-shaped block 801 is stationary or moves forward, and the right arc-shaped block 801 moves backward or is stationary, so that the annular convex block 8 is divided into two arc-shaped blocks 801, facilitating the removal of the arc-shaped blocks 801 from the inside of the buffer liner 2.

[0032] Embodiment 3 A preparation process of the maintenance-free air pack comprises the following steps: First, the buffer liner 2 is prepared by using the preparation device described above. Second, the buffer block 3 is placed in the buffer liner 2, the buffer liner 2 is installed into the shell 1, the flange cover 4 is connected with the shell 1, and the air pack is assembled.

[0033] The above embodiments only express several embodiments of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A maintenance-free air bag, characterized in that, include: Shell (1), buffer liner (2), buffer block (3), and flange cover (4); The buffer liner (2) has an annular groove (202) inside, the bottom of the buffer liner (2) has a groove (201) and the outer wall of the buffer liner (2) is drum-shaped. The damping hole of the buffer liner (2) has a spiral channel.

2. The maintenance-free air pack according to claim 1, characterized in that, There are several annular grooves (202), and several annular grooves (202) are arranged at intervals from top to bottom on the inner wall of the buffer liner (2).

3. The maintenance-free air pack according to claim 1, characterized in that, The maximum tilt angle of the outer wall of the buffer liner (2) is 15°-25°.

4. A device for preparing a maintenance-free air bag, used to process the buffer liner (2) in a maintenance-free air bag as described in claim 1, characterized in that, include: Vulcanizing equipment body (5) and upper mold (6) and lower mold (7) provided on the vulcanizing equipment body (5); The lower mold (7) includes two sub-modules (701) and a driving component (702) for driving the two sub-modules (701) to move closer or further apart from each other. The upper mold (6) includes a mold body (601) and an annular protrusion (8) detachably disposed on the mold body (601) and a protrusion (9) movably disposed on the mold body (601).

5. The apparatus for preparing a maintenance-free air bag according to claim 4, characterized in that, The side wall of the mold (601) is provided with mounting holes (10), the protrusion (9) is slidably disposed in the mounting holes (10), the mold (601) is provided with air guide holes (12), and the mold (601) is provided with a first channel (11) for connecting the air guide holes (12) and the mounting holes (10).

6. The apparatus for preparing a maintenance-free air bag according to claim 5, characterized in that, The protrusion (9) includes a movable block (901), an insert block (902), and a magnetic block (903) disposed on the movable block (901) and the insert block (902). The movable block (901) is provided with an opening (907). A limiting insert block (904) and a spring member (905) connected to the limiting insert block (904) are slidably disposed in the opening (907). The insert block (902) is provided with a slot (906).

7. The apparatus for preparing a maintenance-free air bag according to claim 6, characterized in that, The insert (902) is provided with a marking block (908).

8. The apparatus for preparing a maintenance-free air bag according to claim 4, characterized in that, The annular protrusion (8) is fitted on the outer wall of the mold body (601). The inner wall of the annular protrusion (8) is provided with a fixing groove (15). The outer wall of the mold body (601) is provided with an installation groove (13). The installation groove (13) is provided with a fixing block (14) for inserting into the fixing groove (15) and an elastic element (16) connected to the fixing block (14). The installation groove (13) is connected to the air guide hole (12) through the second channel (17).

9. The apparatus for preparing a maintenance-free air bag according to claim 8, characterized in that, The annular protrusion (8) includes two arc-shaped blocks (801), one end of which is provided with a slot (802), and the other end of which is provided with a first connecting block (803). A second connecting block (804) is provided in the slot (802).

10. A process for preparing a maintenance-free air bag, utilizing the apparatus for preparing a maintenance-free air bag as described in any one of claims 4-9, characterized in that, Includes the following steps: S1: Place the raw material into the cavity of the lower mold (7), move the upper mold (6) down to close with the lower mold (7), pressurize the raw material, and prepare the buffer liner (2). S2: After the preset time, the drive unit (702) drives the two sub-modules (701) to move and separate, so that the molded buffer liner (2) is demolded from the outside. Then the connection between the annular protrusion (8) and the mold body (601) is released and the protrusion (9) is moved, so that the molded buffer liner (2) is separated from the upper mold (6). S3: After placing the buffer block (3) inside the buffer liner (2), install the buffer liner (2) into the housing (1) and connect the flange cover (4) to the housing (1) to assemble the air bag.

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