A hot runner valve needle drive

Abstract

The application relates to the technical field of hot runner equipment, and discloses a hot runner valve needle driving device, which comprises an equipment main body, a valve needle body movably connected to the bottom of the equipment main body, square blocks arranged at the two sides of the top of the equipment main body, driving rods fixedly connected to the bottoms of the square blocks, pistons fixedly connected to the bottoms of the driving rods, the valve needle body and the square blocks being fixedly connected, an oil injection port arranged at the top of the driving rod, an oil discharge hole arranged at the bottom of the driving rod, and round plates fixedly connected to the inner side walls of the driving rods. By pulling the pull block to separate the plug block from the stop block, the lubricating oil is accurately discharged from the oil discharge hole and acts on the piston, the whole process is convenient for storing and releasing the lubricating oil as required, the lubricating oil can be accurately guided to the piston part, the part wear is effectively reduced, the service life of the piston is prolonged, the operation is relatively simple, and the daily maintenance and stable operation of the equipment are facilitated.

Description

Technical Field

[0001] This application relates to the field of hot runner equipment technology, and in particular to a hot runner valve needle drive device. Background Technology

[0002] The hot runner valve needle drive device is an important component used in the field of injection molding. It drives the valve needle to reciprocate linearly through the drive mechanism, thereby closing or opening the flow channel, controlling the flow of plastic melt during the injection process, and realizing the opening and closing of the gate during the injection process.

[0003] When compressed air is input into the drive cylinder through the air inlet, the air pressure pushes the piston upward, causing the valve needle, which is rigidly connected to it, to move upward synchronously, opening the gate channel and allowing molten plastic to be injected into the mold cavity; conversely, when the system switches to the suction state, the air pressure inside the cylinder drops, and the piston returns to its original position under the spring return force or external negative pressure, driving the valve needle to move downward to close the gate and cut off the flow of plastic.

[0004] Since the working environment of the drive unit is usually at a high temperature, traditional lubricating oil will gradually evaporate, resulting in dry friction between the piston and the cylinder. However, due to the limitations of the device structure, it is difficult to increase the amount of lubricating oil to lubricate, which aggravates the wear and tear of the components. Utility Model Content

[0005] To address the aforementioned problem of increased dry friction between the piston and cylinder, this application provides a hot runner valve needle drive device.

[0006] The hot runner valve needle driving device provided in this application adopts the following technical solution:

[0007] A hot runner valve needle drive device includes a main body, a valve needle body movably connected to the bottom of the main body, square blocks on both sides of the top of the main body, a drive rod fixedly connected to the bottom of the square blocks, a piston fixedly connected to the bottom of the drive rod, the valve needle body fixedly connected to the square blocks, an oil inlet at the top of the drive rod, an oil outlet at the bottom of the drive rod, a circular plate fixedly connected to the inner wall of the drive rod, a stopper fixedly connected to the bottom of the inner wall of the drive rod, a lifting rod slidably connected to the middle of the circular plate, a stopper fixedly connected to the bottom of the lifting rod, a baffle fixedly connected to the top of the stopper, a lifting rod fixedly connected to the top of the baffle, a spring sleeved on the surface of the lifting rod, the top of the spring fixedly connected to the baffle, and a lifting block fixedly connected to the top of the lifting rod.

[0008] Preferably, the interior of the stop block fits into the plug block, the interior of the stop block is configured with a groove structure that matches the shape of the plug block, and the plug block is made of wear-resistant rubber material.

[0009] Preferably, the bottom of the spring is fixedly connected to the top of the baffle, and the bottom of the baffle is in contact with the top of the block.

[0010] Preferably, a guide block is fixedly connected to the top of the piston, and the top of the guide block is provided with multiple drainage grooves, which are located at the bottom of the oil drain hole.

[0011] Preferably, the top of the block is bolted to a sealing cap, and the bottom of the sealing cap has an mounting surface that matches the top of the block.

[0012] Preferably, the guide block has a frustum-shaped structure with a top diameter smaller than the bottom diameter, and the depth of the drainage groove gradually decreases from the center to the outer periphery to form a guiding slope.

[0013] Preferably, the surface of the disc is provided with multiple oil leakage through holes.

[0014] In summary, this application includes the following beneficial technical effects:

[0015] 1. When lubrication is required, pull the lifting block to separate the stop block from the stop block, allowing the lubricating oil to be discharged through the oil drain hole and accurately applied to the piston. The whole process is convenient for storing and releasing the lubricating oil as needed, and ensures that the lubricating oil accurately reaches the piston, effectively reducing component wear, extending the service life of the piston, and the operation is relatively simple, which is conducive to the daily maintenance and stable operation of the equipment.

[0016] 2. As the piston moves, the guide block moves accordingly. When lubricating oil is discharged from the drain hole, it first flows through the drainage groove at the top of the guide block. The radial design of the drainage groove guides the lubricating oil evenly to the drain hole, ensuring smooth drainage. The frustum-shaped structure of the guide block helps collect the lubricating oil. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the piston structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the drive rod structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the drive rod of this utility model.

[0021] Figure 5 This is a schematic diagram of the plug structure of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Main body of the equipment; 101. Valve needle body; 102. Block; 103. Drive rod; 104. Piston; 2. Oil inlet; 201. Oil drain hole; 202. Guide block; 203. Drainage groove; 3. Circular piece; 301. Stop block; 302. Plug block; 303. Baffle; 304. Lifting rod; 305. Spring; 306. Lifting block; 4. Sealing cover. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] Reference Figure 1-5 This utility model provides a hot runner valve needle drive device, including a main body 1, a valve needle body 101 movably connected to the bottom of the main body 1, blocks 102 on both sides of the top of the main body 1, a drive rod 103 fixedly connected to the bottom of the blocks 102, a piston 104 fixedly connected to the bottom of the drive rod 103, the valve needle body 101 and the blocks 102 fixedly connected, an oil inlet 2 on the top of the drive rod 103, an oil outlet 201 on the bottom of the drive rod 103, and an oil drain hole 201 on the inner side of the drive rod 103. A circular plate 3 is fixedly connected to the wall. A stopper 302 is fixedly connected to the bottom of the inner wall of the drive rod 103. A lifting rod 304 is slidably connected to the middle of the circular plate 3. A stopper 302 is fixedly connected to the bottom of the lifting rod 304. A baffle 303 is fixedly connected to the top of the stopper 302. A lifting rod 304 is fixedly connected to the top of the baffle 303. A spring 305 is sleeved on the surface of the lifting rod 304. The top of the spring 305 is fixedly connected to the baffle 301. A lifting block 306 is fixedly connected to the top of the lifting rod 304.

[0025] When the hot runner valve needle drive device is working, the main body 1 of the device provides basic support and installation space for the entire device. When it is necessary to drive the valve needle body 101 to move, the air pressure pushes the piston 104 to move upward, which drives the valve needle body 101, which is rigidly connected to it, to move upward in sync, opening the gate channel and allowing molten plastic to be injected into the mold cavity.

[0026] When lubrication of piston 104 is required, the bolts on sealing cover 4 are removed, and lubricating oil is injected into the drive rod 103 through oil inlet 2. The lubricating oil flows into the space formed by the baffle 303 and the inner wall of drive rod 103 through the through hole on disc 3. Under the action of spring 305, baffle 301 and plug 302 remain in contact to form a seal. When lubrication is required, external pulling of lifting block 306 drives lifting rod 304 to move upward, causing plug 302 to separate from baffle 301. Lubricating oil is discharged through oil drain hole 201 to lubricate piston 104.

[0027] When lubrication is required, pulling the lifting block 306 separates the stop block 302 from the retainer block 301, allowing lubricating oil to be discharged through the drain hole 201 and precisely applied to the piston 104. This process facilitates the storage and on-demand release of lubricating oil, ensures accurate delivery of lubricating oil to the piston 104, effectively reduces component wear, extends the service life of the piston 104, and is relatively simple to operate, thus aiding in daily maintenance and stable operation of the equipment.

[0028] In a preferred embodiment, the interior of the stop 301 fits into the plug 302, the interior of the stop 301 is configured with a groove structure that matches the shape of the plug 302, and the plug 302 is made of wear-resistant rubber material.

[0029] The groove structure inside the stop block 301 and the tight fit between the stop block 302 and the plug block 302 form a reliable sealing interface. When the lifting rod 304 is not subjected to external force, the spring 305 presses the plug block 302 tightly into the groove of the stop block 301 to prevent lubricating oil leakage. The plug block 302 is made of wear-resistant rubber material, which can maintain good sealing performance.

[0030] In a preferred embodiment, the bottom of the spring 305 is fixedly connected to the top of the baffle 303, and the bottom of the baffle 303 is in contact with the top of the stop 301.

[0031] The two ends of the spring 305 are fixed between the stop block 301 and the baffle plate 303, respectively, forming an elastic preload. When the lifting block 306 is pulled upward by an external force, the plug 302 disengages from the stop block 301 and lubricating oil flows out. After the external force disappears, the restoring force of the spring 305 resets the stop block 301 and the plug 302 to re-establish a seal.

[0032] In a preferred embodiment, a guide block 202 is fixedly connected to the top of the piston 104, and the top of the guide block 202 is provided with a plurality of drainage grooves 203, which are located at the bottom of the oil drain hole 201.

[0033] As the piston 104 moves, the guide block 202 moves accordingly. When lubricating oil is discharged from the drain hole 201, it first flows through the drainage groove 203 at the top of the guide block 202. The radial design of the drainage groove 203 guides the lubricating oil evenly to the drain hole 201, ensuring smooth oil discharge. The frustum-shaped structure of the guide block 202 helps to collect the lubricating oil.

[0034] In a preferred embodiment, a sealing cover 4 is bolted to the top of the block 102, and the bottom of the sealing cover 4 has an mounting surface that matches the top of the block 102.

[0035] This sealing structure effectively prevents the leakage of lubricating oil, while also keeping the inside of the drive rod 103 sealed.

[0036] In a preferred embodiment, the guide block 202 has a frustum-shaped structure with a top diameter smaller than the bottom diameter, and the depth of the drainage groove 203 gradually decreases from the center to the outer periphery to form a guiding slope.

[0037] The truncated cone-shaped guide block 202, with its inclined structure, helps guide the lubricating oil to the drain hole 201 when the piston 104 moves. The gradually changing depth design of the drainage groove 203 forms a guiding slope, allowing the lubricating oil to be discharged more smoothly.

[0038] In a preferred embodiment, the surface of the disc 3 is provided with a plurality of oil leakage through holes. When lubricating oil enters from the oil inlet 2, it flows through the through holes to the top of the baffle 303.

[0039] The foregoing description, with reference to preferred embodiments, illustrates an exemplary implementation of a hot runner valve needle drive device provided by this disclosure. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, the protection scope of which is determined by the appended claims.

Claims

1. A hot runner valve needle drive device, comprising a main body (1), characterized in that: A valve needle body (101) is movably connected to the bottom of the main body (1). Two square blocks (102) are provided on the top of the main body (1). A drive rod (103) is fixedly connected to the bottom of each block (102). A piston (104) is fixedly connected to the bottom of the drive rod (103). The valve needle body (101) is fixedly connected to the block (102). An oil inlet (2) is provided at the top of the drive rod (103). An oil drain hole (201) is provided at the bottom of the drive rod (103). A circular piece (3) is fixedly connected to the inner wall of the drive rod (103). A stopper (302) is fixedly connected to the bottom of the inner wall of the rod (103). A lifting rod (304) is slidably connected to the middle of the disc (3). A stopper (302) is fixedly connected to the bottom of the lifting rod (304). A baffle (303) is fixedly connected to the top of the stopper (302). A lifting rod (304) is fixedly connected to the top of the baffle (303). A spring (305) is sleeved on the surface of the lifting rod (304). The top of the spring (305) is fixedly connected to the baffle (301). A lifting block (306) is fixedly connected to the top of the lifting rod (304).

2. The hot runner valve needle driving device according to claim 1, characterized in that: The interior of the stop block (301) fits into the plug block (302), and the interior of the stop block (301) is set with a groove structure that matches the shape of the plug block (302). The plug block (302) is made of wear-resistant rubber material.

3. The hot runner valve needle driving device according to claim 1, characterized in that: The bottom of the spring (305) is fixedly connected to the top of the baffle (303), and the bottom of the baffle (303) is in contact with the top of the block (301).

4. The hot runner valve needle driving device according to claim 1, characterized in that: The piston (104) is fixedly connected to a guide block (202), and the top of the guide block (202) is provided with a plurality of drainage grooves (203), which are located at the bottom of the oil drain hole (201).

5. A hot runner valve needle driving device according to claim 1, characterized in that: The top of the block (102) is connected to a sealing cover (4) by bolts, and the bottom of the sealing cover (4) is provided with an installation surface that matches the top of the block (102).

6. A hot runner valve needle driving device according to claim 4, characterized in that: The guide block (202) has a frustum-shaped structure with a top diameter smaller than the bottom diameter, and the depth of the drainage groove (203) gradually decreases from the center to the outer periphery to form a guiding slope.

7. A hot runner valve needle driving device according to claim 1, characterized in that: The surface of the disc (3) is provided with multiple oil leakage holes.

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