Single-cylinder injection device

Abstract

The single-cylinder injection device comprises a driving motor, a motor flange and an injection cylinder barrel, an injection cylinder piston is arranged in the injection cylinder barrel, an injection structure is arranged on the side, away from the driving motor, of the injection cylinder barrel, a rotating structure is arranged in the injection cylinder piston and comprises a spline barrel, and a transmission shaft is arranged on the inner wall of the spline barrel; according to the injection device, the corresponding rotating structure is arranged in the piston of the injection cylinder, the spline barrel can drive the transmission shaft to rotate through the rotating part arranged in the rotating structure, and therefore the driving action of the injection device is achieved; meanwhile, a corresponding fixing structure is arranged to fix the radial position of the injection cylinder piston, the injection cylinder piston is prevented from synchronously rotating along with the transmission shaft, stress is dispersed, and meanwhile, a corresponding liquid display structure is arranged, so that the content of lubricating oil is convenient to observe.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, in particular to a single-cylinder injection device. Background Art

[0002] At present, there are two types of injection devices for injection molding machines: single-cylinder injection and double-cylinder injection. The two cylinders of double-cylinder injection are not synchronized and are not in the same straight line with the injection screw, which easily leads to the disadvantages of slow response and uneven force. Compared with double-cylinder injection, the structure of single-cylinder injection is more compact, occupies less space, and the oil intake is more balanced and the force is more uniform. Therefore, it is widely used in high-speed injection occasions. However, in traditional single-cylinder injection, the seals in the hydraulic cylinder must withstand both sliding axial force and rotating radial force when the piston moves. Long-term friction will cause the seals to fail easily, resulting in reduced sealing performance, which will cause leakage in the oil cylinder and greatly reduce the injection effect. Moreover, the oil cylinder is sealed and it is impossible to observe the lubrication condition inside the oil cylinder in a timely and clear manner, resulting in the failure to add lubricating oil in time, affecting the actual injection use. Summary of the invention

[0003] The object of the present invention is to provide a single-cylinder injection device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a single-cylinder injection device, comprising a driving motor and a motor flange arranged on the output side of the driving motor, an injection cylinder barrel is arranged on one side of the motor flange, an injection cylinder piston is arranged inside the injection cylinder barrel, an injection structure for completing the injection action is arranged on the side of the injection cylinder barrel away from the driving motor, a rotating structure for driving the injection structure to rotate is arranged inside the injection cylinder piston, the rotating structure comprises a spline barrel, a transmission shaft is arranged on the inner wall of the spline barrel, a rotating part is arranged on one side of the transmission shaft, a fixing structure for fixing the radial position of the injection cylinder piston is arranged on the outer wall of the injection structure, and a liquid display structure for displaying the lubricating oil content is arranged on one side of the motor flange.

[0005] Preferably, the injection structure includes an injection seat, and a storage barrel is rotatably connected to the side of the injection seat away from the driving motor, a transmission screw is inserted into the inner wall of the storage barrel, and a screw retaining ring is provided on the side of the transmission screw close to the driving motor.

[0006] Preferably, the output end of the driving motor and the inner wall of the spline cylinder are interlaced and connected, and the rotating part includes bearing one, bearing two, bearing three and bearing four which are horizontally arranged in sequence on the outer wall of the transmission shaft, and a connecting plate is fixedly connected to the outer wall of the injection cylinder piston inside the shell of the injection seat.

[0007] Preferably, the fixed structure includes a symmetrically arranged anti-rotation seat, one side of the anti-rotation seat is fixedly connected to the outer wall of the connecting plate, the other side of the anti-rotation seat is slidably and interlaced with an anti-rotation guide rod, and one side of the anti-rotation guide rod is fixedly connected to the outer wall of the injection seat.

[0008] Preferably, hydraulic structures for pushing the injection cylinder piston to move are provided on both sides of the injection cylinder barrel, the hydraulic structure includes an injection cylinder rear cover, the outer wall of the injection cylinder rear cover and the inner wall of the injection cylinder piston are slidably and interlacedly connected, a rear oil port is provided at the top of the injection cylinder rear cover, an injection cylinder front cover is provided on the side of the injection cylinder barrel away from the injection cylinder rear cover, a front oil port is provided at the top of the injection cylinder front cover, the inner wall of the injection cylinder front cover and the outer wall of the injection cylinder piston are slidably and interlacedly connected, and a bearing five is provided at the connection between the injection cylinder rear cover and the spline barrel and on the side close to the driving motor.

[0009] Preferably, the liquid display structure includes a pressure-resistant oil pipe, which is arranged on the outer wall of the rear cover of the injection cylinder. The outer wall of the rear cover of the injection cylinder is symmetrically provided with oil filling ports, and the oil filling port input end is fixedly connected to the side of the pressure-resistant oil pipe.

[0010] Technical effects and advantages of the present invention:

[0011] The present invention arranges a corresponding rotating structure in the injection cylinder piston, and utilizes the rotating part arranged therein to enable the spline cylinder to drive the transmission shaft to rotate, so as to realize the driving action of the injection device. At the same time, a corresponding fixed structure is arranged to fix the radial position of the injection cylinder piston to prevent it from rotating synchronously with the transmission shaft, so that the stress is dispersed. At the same time, a corresponding liquid display structure is arranged to facilitate the observation of the lubricating oil content. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the overall structure of the present invention.

[0013] Figure 2 For the present invention Figure 1 A magnified view of the structure in the middle.

[0014] Figure 3 It is a schematic diagram of the truncated anti-rotation structure of the present invention.

[0015] Figure 4 It is a side sectional view of the liquid display structure of the present invention.

[0016] In the figure: 1. driving motor; 2. motor flange; 3. injection cylinder rear cover; 301. oil filling port; 4. rear oil port; 5. injection cylinder barrel; 6. injection cylinder piston; 7. spline cylinder; 8. transmission shaft; 9. front oil port; 10. injection cylinder front cover; 11. connecting plate; 12. injection seat; 13. screw retaining ring; 14. transmission screw; 15. storage machine barrel; 16. bearing one; 17. bearing two; 18. bearing three; 19. bearing four; 20. bearing five; 21. pressure-resistant oil pipe; 22. anti-rotation guide rod; 23. anti-rotation seat. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The present invention provides Figure 1-4 A single-cylinder injection device is shown, comprising a driving motor 1 and a motor flange 2 arranged on the output side of the driving motor 1, an injection cylinder 5 is arranged on one side of the motor flange 2, an injection cylinder piston 6 is arranged inside the injection cylinder 5, an injection structure for completing the injection action is arranged on the side of the injection cylinder 5 away from the driving motor 1, a rotating structure for driving the injection structure to rotate is arranged inside the injection cylinder piston 6, the rotating structure comprises a spline cylinder 7, a transmission shaft 8 is arranged on the inner wall of the spline cylinder 7, a rotating part is arranged on one side of the transmission shaft 8, a fixing structure for fixing the radial position of the injection cylinder piston 6 is arranged on the outer wall of the injection structure, and a liquid display structure for displaying the lubricating oil content is arranged on one side of the motor flange 2.

[0019] It should be noted that, by arranging a corresponding rotating structure in the injection cylinder piston 6, the rotating part arranged therein is used to enable the spline cylinder 7 to drive the transmission shaft 8 to rotate, so as to realize the driving action of the injection device. At the same time, a corresponding fixed structure is arranged to fix the radial position of the injection cylinder piston 6 to prevent it from rotating synchronously with the transmission shaft 8, so that the stress is dispersed. At the same time, a corresponding liquid display structure is arranged to facilitate the observation of the lubricating oil content. Furthermore, the drive motor 1 is installed on the motor flange 2, and the spline cylinder 7 is connected to the drive motor 1 in transmission.

[0020] The injection structure includes an injection seat 12, and a storage barrel 15 is rotatably connected to the side of the injection seat 12 away from the driving motor 1. A transmission screw 14 is inserted into the inner wall of the storage barrel 15, and a screw retaining ring 13 is sleeved on the side of the transmission screw 14 close to the driving motor 1.

[0021] Furthermore, the injection cylinder piston 6 is moved horizontally on the spline cylinder 7, and the transmission screw 14 is driven to perform the injection action through the engagement between the transmission shaft 8 and the screw retaining ring 13.

[0022] The output end of the driving motor 1 and the inner wall of the spline cylinder 7 are interlaced and connected, and the rotating part includes bearing 16, bearing 2 17, bearing 3 18 and bearing 4 19 which are horizontally arranged in sequence on the outer wall of the transmission shaft 8. A connecting plate 11 is fixedly connected to the outer wall of the injection cylinder piston 6 inside the shell of the injection seat 12.

[0023] Furthermore, a step hole is provided at the front end face of the injection cylinder piston 6, and a connecting plate 11 is provided at the rear end of the injection cylinder piston 6, wherein the inner side face of the bearing abuts against the step surface of the step hole, and the outer side face of the bearing abuts against the inner side face of the connecting plate 11 and is used in conjunction with a seal.

[0024] The fixed structure includes a symmetrically arranged anti-rotation seat 23, one side of which is fixedly connected to the outer wall of the connecting plate 11, and the other side of the anti-rotation seat 23 is slidably connected with an anti-rotation guide rod 22, one side of the anti-rotation guide rod 22 is fixedly connected to the outer wall of the injection seat 12.

[0025] Furthermore, the anti-rotation seat 23 is fixedly connected to the outer wall of the connecting plate 11 by bolts, and a sliding hole is provided on the side of the anti-rotation seat 23 away from the connecting plate 11, so that the anti-rotation seat 23 can be horizontally moved along the anti-rotation guide rod 22 through the sliding hole, and the anti-rotation guide rod 22 is also fixed to the outer wall of the injection seat 12 by fixing bolts, so the radial rotation of the injection cylinder piston 6 can be effectively limited by the anti-rotation guide rod 22, but its horizontal position movement will not be affected.

[0026] Hydraulic structures for pushing the injection cylinder piston 6 to move are arranged on both sides of the injection cylinder barrel 5, and the hydraulic structure includes an injection cylinder rear cover 3, the outer wall of the injection cylinder rear cover 3 and the inner wall of the injection cylinder piston 6 are slidably and interlacedly connected, and a rear oil port 4 is arranged at the top of the injection cylinder rear cover 3, and an injection cylinder front cover 10 is arranged on the side of the injection cylinder barrel 5 away from the injection cylinder rear cover 3, and a front oil port 9 is arranged at the top of the injection cylinder front cover 10, and the inner wall of the injection cylinder front cover 10 and the outer wall of the injection cylinder piston 6 are slidably and interlacedly connected, and a bearing 5 20 is arranged at the connection between the injection cylinder rear cover 3 and the spline barrel 7 and on the side close to the drive motor 1.

[0027] Furthermore, when the injection molding machine is melting the plastic, the drive motor 1 rotates, and the splines on the output shaft extending into the spline barrel 7 cooperate with the spline holes, driving the spline barrel 7 to rotate, and the spline barrel 7 then drives the transmission shaft 8 to rotate. The transmission screw 14 is fixed to the rear end of the transmission shaft 8 by the screw retaining ring 13, so the transmission shaft 8 drives the transmission screw 14 to rotate, and the plastic particles enter as the transmission screw 14 rotates, and gradually become a molten state; during injection, the hydraulic oil enters the injection cylinder barrel 5 from the rear oil port 4, pushing the injection cylinder piston 6 to slide forward in the spline barrel 7, driving the transmission screw 14 to move forward together, and completing the injection action.

[0028] The liquid display structure includes a pressure-resistant oil pipe 21, which is arranged on the outer wall of the injection cylinder rear cover 3. The outer wall of the injection cylinder rear cover 3 is symmetrically provided with oil filling ports 301, and the input end of the oil filling port 301 is fixedly connected to the side of the pressure-resistant oil pipe 21.

[0029] Furthermore, the liquid display structure connects the upper and lower lubricating oil ports of the injection cylinder rear cover 3 through a pressure-resistant oil pipe 21 made of an oil-resistant transparent rubber hose, so that the lubricating oil level in the injection cylinder 5 is clearly visible. At the same time, lubricating oil is injected through the two lubricating oil ports to lubricate and cool the transmission parts, that is, to lubricate and cool the connection between the drive motor 1 and the transmission parts.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-cylinder injection device, comprising a drive motor (1) and a motor flange (2) arranged on the output side of the drive motor (1), an injection cylinder (5) being arranged on one side of the motor flange (2), an injection cylinder piston (6) being arranged inside the injection cylinder (5), characterized in that: An injection structure for completing the injection action is arranged on the side of the injection cylinder (5) away from the drive motor (1), a rotating structure for driving the injection structure to rotate is arranged inside the injection cylinder piston (6), the rotating structure comprises a spline cylinder (7), a transmission shaft (8) is arranged on the inner wall of the spline cylinder (7), a rotating part is arranged on one side of the transmission shaft (8), a fixing structure for fixing the radial position of the injection cylinder piston (6) is arranged on the outer wall of the injection structure, and a liquid display structure for displaying the lubricating oil content is arranged on one side of the motor flange (2).

2. A single-cylinder injection device according to claim 1, characterized in that: The injection structure comprises an injection seat (12), a side of the injection seat (12) away from the driving motor (1) is rotatably connected with a storage barrel (15), an inner wall of the storage barrel (15) is connected with a transmission screw (14), and a screw retaining ring (13) is sleeved on the side of the transmission screw (14) close to the driving motor (1).

3. A single-cylinder injection device according to claim 2, characterized in that: The output end of the drive motor (1) and the inner wall of the spline cylinder (7) are interlaced and connected, and the rotating member includes a bearing 1 (16), a bearing 2 (17), a bearing 3 (18) and a bearing 4 (19) which are arranged horizontally and laterally in sequence on the outer wall of the transmission shaft (8), and a connecting plate (11) is fixedly connected to the outer wall of the injection cylinder piston (6) inside the shell of the injection seat (12).

4. A single-cylinder injection device according to claim 2, characterized in that: The fixed structure comprises a symmetrically arranged anti-rotation seat (23), one side of the anti-rotation seat (23) being fixedly connected to the outer wall of the connecting plate (11), and the other side of the anti-rotation seat (23) being slidably interlaced with an anti-rotation guide rod (22), one side of the anti-rotation guide rod (22) being fixedly connected to the outer wall of the injection seat (12).

5. A single-cylinder injection device according to claim 1, characterized in that: A hydraulic structure for pushing the injection cylinder piston (6) to move is arranged on both sides of the injection cylinder barrel (5), and the hydraulic structure includes an injection cylinder rear cover (3), the outer wall of the injection cylinder rear cover (3) and the inner wall of the injection cylinder piston (6) are slidably connected, and a rear oil port (4) is arranged at the top of the injection cylinder rear cover (3), and an injection cylinder front cover (10) is arranged on the side of the injection cylinder barrel (5) away from the injection cylinder rear cover (3), and a front oil port (9) is arranged on the top of the injection cylinder front cover (10), and the inner wall of the injection cylinder front cover (10) and the outer wall of the injection cylinder piston (6) are slidably connected, and a bearing five (20) is arranged at the connection between the injection cylinder rear cover (3) and the spline barrel (7) and the side close to the drive motor (1).

6. A single-cylinder injection device according to claim 5, characterized in that: The liquid display structure comprises a pressure-resistant oil pipe (21), the pressure-resistant oil pipe (21) being arranged on the outer wall of the injection cylinder rear cover (3), the outer wall of the injection cylinder rear cover (3) being symmetrically provided with oil filling ports (301), the input end of the oil filling port (301) being fixedly connected to the side of the pressure-resistant oil pipe (21).

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