Feeding device applied to injection molding machine

Abstract

The utility model provides a feeding device applied to an injection molding machine, which comprises a feeding cylinder, the feeding cylinder comprises a feeding cylinder body and a discharging cylinder body, a material pumping shaft and a connecting ring are arranged in the feeding cylinder body, a limit valve body sleeved on the material pumping shaft penetrates through the middle part of the connecting ring to the inside of the discharging cylinder body, the bottom of the limit valve body is fixedly connected with a connecting block, and the connecting block is fixedly connected with the feeding cylinder body. More than two concave sides are arranged on the outer side of the connecting block, fixing columns extending outwards are arranged in the concave sides, the end, deviating from the center of the swing block, of the swing block is connected to the fixing columns on the concave sides of the connecting block in a sleeving mode and rotationally connected with the fixing columns, and the upper end of a guide column arranged on the outer side of the swing block is embedded into a counter bore of the connecting ring; the lower end of the guide column is fixed through a limiting piece after sleeving the fixed column, a step part is arranged on the side, close to the swing block, of the guide column, and one end of the concave side of the connecting block protrudes outwards to form a supporting part; according to the utility model, materials can be continuously conveyed, the conveying interruption phenomenon is avoided, the structural reliability is good, and the practicability is realized.

Description

Technical Field

[0001] This utility model relates to the field of injection molding material feeding technology, specifically to a feeding device applied to an injection molding machine. Background Technology

[0002] In the injection molding process, the material is usually heated, extruded, and conveyed into the mold. However, if material is continuously pumped into the cavity using a vacuum pump, the pressure inside the cavity will become excessive and unstable, leading to inconsistent material output. Furthermore, moving the vacuum pump wastes energy. Therefore, existing injection molding machines generally employ a continuous, intermittent, multiple-stage vacuum pumping method to better meet the material requirements. For example, Chinese patent application number 201922049718.0, published on 202... Patent document 0.06.26 discloses a feeding core device, including an axially moving valve, a first check valve, and a driving component; the axially moving valve is slidably disposed at the inlet of the feeding cylinder; the first check valve is fixed in the middle of the inner wall of the feeding cylinder, and the axially moving valve is located on the inlet side of the first check valve; a first cavity is formed in the feeding cylinder between the axially moving valve and the first check valve; a discharge cavity communicating with the discharge port is located on the discharge side of the first check valve in the feeding cylinder, and the volume of the discharge cavity is smaller than the volume of the first cavity; the driving component drives the axially moving valve.

[0003] In the aforementioned patent document, when the silica material enters the first cavity, since the volume of the first cavity is larger than that of the discharge cavity, the silica material is compressed through the one-way action of the one-way valve, thereby reducing the generation of air bubbles and improving the discharge quality. However, after the first one-way valve opens the second one-way valve, the first one-way valve does not have a buffering effect during its descent. Under the action of the material and its own gravity, it will quickly close the channel between the first and second cavities. Therefore, it needs to be reopened for storage and discharge in the next feeding process, which may prevent the material from being continuously conveyed. Utility Model Content

[0004] The purpose of this utility model is to provide a feeding device for injection molding machines, which enables continuous material conveying, avoids interruption of feeding, and has good structural reliability and practicality.

[0005] This utility model provides the following technical solution: a feeding device for an injection molding machine, comprising a feeding cylinder, the feeding cylinder including an infeed cylinder and an outlet cylinder, the infeed cylinder being provided with a drawing shaft and a connecting ring, a limiting valve body sleeved on the drawing shaft passing through the middle of the connecting ring to the outlet cylinder, a feeding chamber being formed between the infeed cylinder and the drawing shaft, a switching valve being provided in the outlet cylinder, a storage chamber being formed between the switching valve and the outlet cylinder, one end of the drawing shaft being connected to the switching valve, the bottom of the drawing shaft being elastically connected to a piston, one end of the limiting valve body communicating with the outlet chamber, and a connecting block being fixedly connected to the other end of the limiting valve body, a buffer device being provided on the connecting block, the buffer device generating an upward buffering force on the limiting valve body when the limiting valve body moves downward.

[0006] The above setup allows the piston to move upward under the thrust of the material after it enters the feed cylinder. This upward movement of the limit valve connects one end of the limit valve to the discharge chamber. The upward movement of the piston also causes the feed axial force to open the switch valve, allowing the material to enter the discharge chamber from the storage chamber. When the first feeding is completed, the limit valve moves downward under gravity. The buffer device generates an upward buffering force on the limit valve as it moves downward, ensuring that the limit valve remains connected to the storage chamber for material storage during the buffering period. The switch valve does not close instantly. When the second feeding begins, the switch valve opens, allowing the material in the storage chamber to be discharged without interruption during the first input and second feeding periods. This ensures better continuous feeding.

[0007] Furthermore, the buffer device includes a swing block, and the outer side of the connecting block is provided with two or more recessed sides. The recessed sides are provided with outwardly extending fixed posts. One end of the swing block that is off-center from the center of the swing block is sleeved on the fixed post on the recessed side of the connecting block and is rotatably connected to the fixed post. The upper end of the guide post on the outer side of the swing block is embedded in the countersunk hole of the connecting ring. The lower end of the guide post is sleeved on the fixed post and fixed by a limiting member. The side of the guide post near the swing block is provided with a stepped part. One end of the recessed side of the connecting block protrudes outward to form a support part.

[0008] The above setup, after the material enters the feed cylinder, under the thrust of the material and the guidance of the guide column, pushes the limit valve body and connecting block upward along the axial direction. At this time, the feed cylinder and the discharge cylinder are connected. Since the swing block is eccentrically connected to the fixed column, when not in use, one end of the swing block tends to swing downward due to gravity. When the material enters, the material in the feed cylinder enters the discharge cylinder through the connecting ring, and the swing block is subjected to the upward force of the material. After the swing block swings, it abuts against the support part on the concave side of the connecting block, and the material enters the discharge cylinder through the gap between the swing block and the concave side. After the material enters the discharge cylinder, the limit valve body and the connecting block, under their own gravity, move upward. When the device is used, it moves downward along the axis to reset. Since the swing block is off-center and sleeved on the fixed column, the swing block swings downward around the fixed column. At the same time, the end of the swing block near the support swings upward and abuts against the stepped part of the guide column, generating an upward force on the guide column. This creates a buffering tendency to prevent the limit valve body from moving downward, avoiding the instantaneous closure of the limit valve body and the connecting ring when the limit valve body moves downward instantly. This allows the material in the feed cylinder to be fed again before the limit valve body and the connecting ring close, thus avoiding the interruption of material feeding in the discharge cylinder. Then, the material is fed a second time during the buffer time, allowing the material to enter the storage chamber for conveying, thereby achieving continuous conveying.

[0009] Furthermore, the limiting valve body includes a first connector, a second connector, and a third connector. The two ends of the second connector are connected to the first connector and the third connector, respectively. The outer edge of the first connector is chamfered and abuts against the upper end of the connecting ring. The connecting ring is provided with a second through hole that matches the second connector. The third connector is connected to the connecting block.

[0010] The above settings enable the connecting block and the limit valve body to be connected as one unit, achieving synchronous lifting and lowering.

[0011] Furthermore, the outer side of the second connecting body is provided with two or more recessed sides that are recessed inward along the radial direction of the feeding shaft to form a second recessed side, and a second protrusion is formed between adjacent second recessed sides. The inner side of the second through hole is provided with a sliding groove that matches the second protrusion, and the second protrusion is slidably connected to the sliding groove.

[0012] The above settings can guide the second connector to move up and down in the second through hole through the slide groove. At the same time, when the first connector separates from the upper end of the connecting ring, the material in the feed cylinder can pass through the second through hole through the second recessed side and enter the discharge cylinder.

[0013] Furthermore, the connecting body three is fixedly connected to the connecting block, and the outer side of the connecting body three is provided with two or more recessed sides that are recessed inward along the radial direction of the feeding shaft to form a third recessed side, and a third protrusion is formed between the third recessed sides.

[0014] The above design facilitates the accommodation of the guide post on the third recessed side, allowing the guide post to be embedded in the connecting ring and preventing the limit valve body and connecting block from interfering with the up-and-down movement of the guide post.

[0015] Furthermore, the recessed side is recessed inward along the radial direction of the feeding shaft, a washer is sleeved on the fixed column, the swing block is located between the washer and the guide column, and a notch is provided at one end of the swing block near the connection between the swing block and the fixed column. When the swing block is in a horizontal state, the notch abuts against the support.

[0016] With the above settings, as the material flows from the feed cylinder to the discharge cylinder, it can push the swing block to rotate to a horizontal state. Then, the support part supports the swing block, so that the swing block is in a horizontal state. During the descent of the limit valve body and the connecting block, the swing block can rotate on its own due to the offset of the center of gravity.

[0017] Furthermore, the guide post has a first step on the side away from the swing block, and the limiting member is sleeved on the first step after being attached to the fixed post.

[0018] With the above settings, after the washer ring, swing block, and guide post are fitted onto the fixed post, they can be locked by the limiting component.

[0019] Furthermore, the discharge cylinder is provided with a fixed shaft, and the switching valve includes a one-way valve body. The lower end of the fixed shaft, which is sleeved with a spring, is embedded in the upper cavity of the one-way valve body and connected to the upper end of the one-way valve body. A valve core is provided on the spring. The lower end of the one-way valve body abuts against the connecting body. The lower end of the one-way valve body is provided with a lower cavity, and the valve core abuts against the connection between the upper cavity and the lower cavity.

[0020] The above configuration allows the material extraction shaft to move upward along the axial direction and embed itself into the lower cavity of the one-way valve body, thereby lifting the valve core at the connection between the upper and lower cavities, thus connecting the upper and lower cavities. After the material extraction shaft moves downward along the axial direction, the valve core is reset by the action of the spring.

[0021] Furthermore, the outer side of the upper cavity is provided with two or more circumferentially arranged upper cavity openings. After the fixed shaft is connected to the upper end of the one-way valve body, a discharge cavity is formed between it and the discharge cylinder. The discharge cavity is connected to the upper cavity through the upper cavity openings. The upper end of the discharge cavity is provided with a discharge port. The outer side of the lower cavity is provided with two or more circumferentially arranged lower cavity openings. A storage cavity is formed between the lower end of the one-way valve body and the discharge cylinder. The storage cavity is connected to the lower cavity through the lower cavity openings.

[0022] The above configuration allows the material to enter the storage chamber from the feed cylinder through the connecting ring, and then enter the lower chamber through the lower opening. After the valve core is lifted by the feeding shaft, the material can flow from the lower chamber to the upper chamber, and then flow through the upper opening to the discharge chamber, and finally flow out from the discharge port, thus realizing material extrusion and conveying.

[0023] Furthermore, the upper end of the fixed shaft is connected to the connection port, one end of the connection port is connected to the storage chamber, and the other end of the connection port is connected to an external vacuuming device.

[0024] The above settings facilitate vacuuming, thereby extracting the material.

[0025] Furthermore, a feeding chamber is formed between the feeding cylinder and the feeding shaft. A piston is provided at the lower end of the feeding shaft, and an opening is provided on the piston. A cover plate is provided at the upper end of the opening, and the cover plate is connected to a spring sleeved on the feeding shaft.

[0026] The above configuration allows the material extraction shaft to extend into the material barrel through the barrel cover, and after vacuuming, the material in the material barrel is squeezed into the feeding chamber by the piston. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0029] Figure 3 This is a partial structure of the present invention.

[0030] Figure 4 This is a partial exploded view of the present invention.

[0031] Figure 5 for Figure 3 A magnified view of a portion of the image.

[0032] Figure 6 for Figure 4 A magnified view of a portion of the image. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1-6As shown, this utility model provides a feeding device for an injection molding machine, including a feeding cylinder connected to the lid z1 of a material barrel (not shown in the figure). The feeding cylinder includes an infeed cylinder body z2 and an outlet cylinder body z3. The infeed cylinder body z2 contains a suction shaft z4 and a connecting ring z5, forming an infeed chamber z6 between the infeed cylinder body z2 and the suction shaft z4. An on / off valve is installed inside the outlet cylinder body z2, forming a storage chamber between the on / off valve and the outlet cylinder body z3. One end of the suction shaft z4 is connected to the on / off valve, and the bottom of the suction shaft z4 is elastically connected to a piston. One end of a limit valve body communicates with the outlet chamber, and the other end of the limit valve body is fixedly connected to a connecting block z7. A buffer device is installed on the connecting block z7, which generates an upward buffering force on the limit valve body when it moves downward. In this embodiment, the on / off valve is a one-way valve, and the buffer device is a swing block.

[0035] A feeding chamber z6 is formed between the feeding cylinder z2 and the extraction shaft z4. The lower end of the connecting ring z5 abuts against the second step (not shown in the figure) on the inner side of the feeding cylinder z2. The upper end of the connecting ring z5 abuts against the lower end of the discharge cylinder z3. A sealing ring is sleeved on the outer side of the connecting ring z5. A limit valve body is sleeved on the upper end of the extraction shaft z4. The limit valve body passes through the middle of the connecting ring z5 to the discharge cylinder z3. A connecting block z7 is fixedly connected to the bottom of the limit valve body. The limit valve body includes a first connecting body z11, a second connecting body z12, and a third connecting body z13. The first connecting body z11, the second connecting body z12, and the third connecting body z13 are connected to the second connecting body z13. Each of the three connecting bodies z13 has a through hole (not shown in the figure) that matches the material extraction shaft z4. The two ends of the second connecting body z12 are connected to the first connecting body z11 and the third connecting body z13 respectively. The outer edge of the first connecting body z11 forms a chamfer that abuts against the upper end of the connecting ring z5. The connecting ring z5 has a second through hole (not shown in the figure) that matches the second connecting body z12. The third connecting body z13 is fixedly connected to the connecting block z7, thereby connecting the connecting block z7 to the limit valve body to form an integral unit. The outer side of the connecting block z7 has two or more recessed sides z71. In this embodiment, the recessed sides z71 are set as... Three recessed sides, Z71 and Z8, are recessed inward along the radial direction of the feeding shaft Z4. One end of the recessed side Z71 protrudes outward to form a support Z9. There is a gap between the recessed side Z71 and the swing block. A washer Z10 is fitted onto the fixed column Z8. One end of the swing block Z21, which is off-center from the center of the swing block Z21, is fitted onto the fixed column Z8 and is rotatably connected to the fixed column Z8. The upper end of the guide column Z22, which is located outside the swing block Z21, is embedded in the countersunk hole (not shown in the figure) of the connecting ring Z5. The lower end of the guide column Z22 is fitted onto the fixed column Z8 and fixed by the limiting member Z23. This makes the swing block Z21... Located between the gasket ring z10 and the guide post z22, the swing block z21 has a notch z211 at one end near the connection between the swing block z21 and the fixed post z8. When the swing block z21 is in a horizontal state, the notch abuts against the support part z9. In this way, when the material flows from the feed cylinder z2 to the discharge cylinder z3, it can push the swing block z21 to rotate to a horizontal state. Then, the support part z9 supports the swing block z21, so that the swing block z21 is in a horizontal state. During the descent of the limit valve body and the connecting block z7, the swing block z21 can rotate on its own due to the offset of the center of gravity.

[0036] The outer side of the connecting body z12 has two or more recessed sides z122 that are recessed inward along the radial direction of the feeding shaft z4. A second protrusion z1222 is formed between adjacent second recessed sides z122. The inner side of the second through hole has a sliding groove (not shown in the figure) that matches the second protrusion z1222. The second protrusion z1222 is slidably connected to the sliding groove. In this way, the sliding groove can guide the connecting body z12 as it moves up and down in the second through hole. At the same time, when the connecting body z11 is separated from the upper end of the connecting ring z5, the material in the feeding cylinder z2 can pass through the second recessed side z1222 and the second through hole into the discharge cylinder z3.

[0037] The upper end of the connecting body three z13 is fixedly connected to the connecting body two z12, and the lower end of the connecting body three z13 is fixedly connected to the connecting block z7. The outer side of the connecting body three z13 is provided with two or more recessed sides z133 that are recessed inward along the radial direction of the feeding shaft z4. A third protrusion z1333 is formed between adjacent third recessed sides z133, so that the third recessed side z133 can accommodate the guide post z22, so that the guide post z22 can be embedded in the connecting ring z5, avoiding the limit valve body and the connecting block z7 from interfering with the up and down movement of the guide post z22.

[0038] In this embodiment, there are three of each of the second recessed side z122 and the third recessed side z133. The distance from the outer side of the third protrusion z1333 to the center of the connecting body z13 is greater than the diameter of the second through hole. In this way, when the limiting valve body moves upward along the axial direction, the third protrusion z1333 can limit the limiting valve body.

[0039] In this embodiment, the guide post z22 has a stepped portion z20 on the side near the swing block z21, and a first stepped portion z24 on the side away from the swing block z21. The limiting member z23 is sleeved on the fixed post z8 and located on the first stepped portion z24. The fixed post z8 has a thread on the end away from the recessed side z71. The limiting member z23 is screwed onto the fixed post z8. The limiting member is a nut. In this way, after the washer z10, the swing block z21 and the guide post z22 are sleeved on the fixed post z8, they can be locked by the limiting member z23.

[0040] The discharge cylinder z3 is equipped with a fixed shaft z31 and a one-way valve body z32. The lower end of the fixed shaft z31, which is fitted with a spring z33, is embedded in the upper cavity of the one-way valve body z32 and connected to the upper end of the one-way valve body z32. A valve core z34 is provided on the spring z33. The lower end of the one-way valve body z32 abuts against the connecting body z11. The lower end of the one-way valve body z32 is provided with a lower cavity. The valve core z34 abuts against the connection between the upper cavity and the lower cavity. This facilitates the upward movement of the extraction shaft z4 along the axial direction to embed into the lower cavity of the one-way valve body z32, thereby lifting the valve core z34 at the connection between the upper cavity and the lower cavity, so that the upper cavity and the lower cavity are connected. After the extraction shaft z4 moves downward along the axial direction, the valve core z34 is reset under the action of the spring z33.

[0041] The outer side of the upper cavity is provided with two or more circumferentially arranged upper cavity openings z35. After the fixed shaft z31 is connected to the upper end of the one-way valve body z32, a discharge cavity z36 is formed between it and the discharge cylinder z3. The discharge cavity z36 is connected to the upper cavity through the upper cavity openings z35. The upper end of the discharge cavity z36 is provided with a discharge port z37. The outer side of the lower cavity is provided with two or more circumferentially arranged lower cavity openings z38. The lower end of the one-way valve body z32 forms a gap between it and the discharge cylinder z3. The storage chamber z39 is connected to the lower chamber via the lower opening z38. Material enters the storage chamber z39 from the feed cylinder z2 through the connecting ring z5, and then enters the lower chamber through the lower opening z38. After the valve core z34 is lifted by the extraction shaft z4, the material flows from the lower chamber to the upper chamber, then through the upper opening z35 to the discharge chamber z36, and finally out through the discharge port z37, thus achieving material extrusion and conveying. In this embodiment, the volume of the feed chamber z6 is larger than that of the storage chamber z39, ensuring that the material drawn into the feed chamber z6 during each feeding process fills the storage chamber z39 after passing through the connecting ring z5. The volume of the storage chamber z39 is larger than that of the discharge chamber z36, thus ensuring that the material from the storage chamber z39 can fill the discharge chamber z36 after passing through the one-way valve body z32 during each discharge process, thereby ensuring that the material in the discharge chamber z36 can be output from the discharge port z37.

[0042] The upper end of the fixed shaft z31 is connected to the connection port z40. The contact point between the connection port z40 and the discharge cylinder z3 is sealed. One end of the connection port z40 is connected to the discharge chamber z36, and the other end of the connection port z40 is connected to an external vacuuming device to achieve vacuuming and extract the material.

[0043] The lower end of the material extraction shaft z4 is provided with a piston z41, and the piston z41 has an opening (not shown in the figure). The upper end of the opening is provided with a cover plate z42, and the cover plate z42 is connected to a spring z43 sleeved on the material extraction shaft z4. A sealing ring is provided at the connection between the feed cylinder z2 and the barrel cover z1, so that the material extraction shaft z4 can extend into the material barrel through the barrel cover z1. After vacuuming, the material in the material barrel is squeezed into the feed chamber z6 through the piston z41.

[0044] The working principle of this utility model is as follows: After the material is drawn into the feed cylinder z2 by the piston z41, under the thrust of the material, the limit valve body and the connecting block z7 are pushed upward along the axial direction. At the same time, the feeding shaft z4 pushes up the valve core z34, so that the material in the feed cylinder enters the storage chamber z39 through the connecting ring, and then flows to the discharge chamber z36 through the one-way valve body z32. Since the swing block is eccentrically connected to the fixed column, when not in use, one end of the swing block tends to swing downward due to gravity. When the material enters, the swing block z21 is subjected to the upward force of the material. After the swing block z21 swings, it abuts against the support part on the concave side. The material enters the discharge cylinder through the gap between the swing block and the concave side. After the material enters the discharge cylinder, the limit valve body... Under its own weight, the connecting block z7 moves downward along the axis and resets. Since the swing block z21 is off-center and sleeved on the fixed column, the swing block z21 swings downward around the fixed column z8. At the same time, the end of the swing block z21 near the support swings upward and abuts against the stepped part of the guide column, generating an upward force on the guide column z22. This creates a buffering tendency to prevent the limit valve body from moving downward, thus preventing the limit valve body from closing instantly with the connecting ring when it moves downward instantly. This allows the material in the feeding cylinder to be fed again before the limit valve body and the connecting ring close, thereby preventing the material in the discharging cylinder from being interrupted. Then, the material is conveyed a second time during the buffer time, allowing the material to enter the storage chamber for conveying, thus achieving continuous conveying.

Claims

1. A feeding device for an injection molding machine, comprising a feeding cylinder, the feeding cylinder including an infeed cylinder and an outlet cylinder, characterized in that: The feed cylinder is equipped with a feeding shaft and a connecting ring. A limit valve body sleeved on the feeding shaft passes through the middle of the connecting ring to the discharge cylinder. A feeding chamber is formed between the feed cylinder and the feeding shaft. A switch valve is installed in the discharge cylinder. A storage chamber is formed between the switch valve and the discharge cylinder. One end of the feeding shaft is connected to the switch valve. The bottom of the feeding shaft is elastically connected to a piston. One end of the limit valve body communicates with the discharge chamber. A connecting block is fixedly connected to the other end of the limit valve body. A buffer device is installed on the connecting block. The buffer device generates an upward buffering force on the limit valve body when it moves downward.

2. The feeding device for an injection molding machine according to claim 1, characterized in that: The buffer device includes a swing block, and the outer side of the connecting block has two or more recessed sides. The recessed sides are provided with outwardly extending fixed posts. One end of the swing block that is off-center from the center of the swing block is sleeved on the fixed post on the recessed side of the connecting block and is rotatably connected to the fixed post. The upper end of the guide post set on the outer side of the swing block is embedded in the countersunk hole of the connecting ring. The lower end of the guide post is sleeved on the fixed post and fixed by a limiting member. The side of the guide post near the swing block is provided with a stepped part. One end of the recessed side of the connecting block protrudes outward to form a support part.

3. The feeding device for an injection molding machine according to claim 1, characterized in that: The limiting valve body includes a first connector, a second connector, and a third connector. The two ends of the second connector are connected to the first connector and the third connector, respectively. The outer edge of the first connector is chamfered and abuts against the upper end of the connecting ring. The connecting ring is provided with a second through hole that matches the second connector. The third connector is connected to the connecting block.

4. A feeding device for an injection molding machine according to claim 3, characterized in that: The outer side of the second connector is provided with two or more recessed sides that are recessed inward along the radial direction of the feeding shaft to form a second recessed side. A second protrusion is formed between the second recessed sides. The inner side of the second through hole is provided with a sliding groove that matches the second protrusion. The second protrusion is slidably connected to the sliding groove.

5. A feeding device for an injection molding machine according to claim 3, characterized in that: The connecting body three is fixedly connected to the connecting block. The outer side of the connecting body three has two or more recessed sides that are recessed inward along the radial direction of the feeding shaft to form a third recessed side. A third protrusion is formed between the third recessed sides.

6. A feeding device for an injection molding machine according to claim 2, characterized in that: The recessed side is recessed inward along the radial direction of the material extraction shaft. A washer is sleeved on the fixed column. The swing block is located between the washer and the guide column. A notch is provided at one end of the swing block near the connection between the swing block and the fixed column. When the swing block is in a horizontal state, the notch abuts against the support.

7. A feeding device for an injection molding machine according to claim 2, characterized in that: The guide post has a first step on the side away from the swing block, and the limiting member is sleeved on the first step after being attached to the fixed post.

8. A feeding device for an injection molding machine according to claim 1, characterized in that: The discharge cylinder is equipped with a fixed shaft and a one-way valve body. The lower end of the fixed shaft, which is fitted with a spring, is embedded in the upper cavity of the one-way valve body and connected to the upper end of the one-way valve body. A valve core is provided on the spring. The lower end of the one-way valve body abuts against the connecting body. The lower end of the one-way valve body is provided with a lower cavity, and the valve core abuts against the connection between the upper cavity and the lower cavity.

9. A feeding device for an injection molding machine according to claim 8, characterized in that: The outer side of the upper cavity is provided with two or more upper cavity openings arranged in a circle. After the fixed shaft is connected to the upper end of the one-way valve body, a discharge cavity is formed between it and the discharge cylinder. The discharge cavity is connected to the upper cavity through the upper cavity opening. The upper end of the discharge cavity is provided with a discharge port. The outer side of the lower cavity is provided with two or more lower cavity openings arranged in a circle. The lower end of the one-way valve body is connected to the discharge cylinder to form a storage cavity. The storage cavity is connected to the lower cavity through the lower cavity opening.

10. A feeding device for an injection molding machine according to claim 8, characterized in that: The upper end of the fixed shaft is connected to the connection port. One end of the connection port is connected to the storage chamber, and the other end of the connection port is connected to the external vacuum equipment. A feeding chamber is formed between the feeding cylinder and the feeding shaft. The lower end of the feeding shaft is provided with a piston. The piston is provided with an opening. The upper end of the opening is provided with a cover plate. The cover plate is connected to a spring sleeved on the feeding shaft.

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