Injection mechanism of injection molding machine

Abstract

The utility model discloses an injection mechanism of an injection molding machine, which comprises an injection charging barrel and a charging barrel seat, and is characterized in that a concave positioning and mounting cavity is arranged in the charging barrel seat, the injection charging barrel is positioned and mounted in the positioning and mounting cavity, and an annular limiting ring is arranged on the injection charging barrel; the annular limiting ring is arranged behind the front supporting wall of the charging barrel base and fixedly connected with the front supporting wall of the charging barrel base, and a heat insulation plate is arranged between the annular limiting ring and the front supporting wall of the charging barrel base. The injection charging barrel has the advantages of simple structure and capability of effectively reducing heat loss of the injection charging barrel.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to an injection mechanism of an injection molding machine. Background Art

[0002] The injection mechanism of the currently existing injection molding machine is conventionally composed of an injection barrel and a barrel seat. The injection barrel is arranged on the barrel seat and supported by the barrel seat. A positioning ring and a positioning block are arranged on the barrel seat. A limiting protrusion is arranged on the injection barrel. The positioning ring and the positioning block are respectively arranged in front and behind the limiting protrusion to play a limiting role. The positioning ring is sleeved on the injection barrel and limitedly arranged in front of the limiting protrusion, and is fixedly connected to the barrel seat by screws. In order to minimize the heat loss of the injection barrel, a heat insulation structure is usually arranged between the positioning ring and the limiting protrusion of the injection barrel, and a heat insulation plate is usually installed between the two. For the injection mechanism of this structure, firstly, during operation, the injection pressure will be transmitted to the positioning ring through the injection barrel. The positioning ring is prone to bending and deformation under long-term impact load, and the heat insulation plate will also be deformed and bent, and then damaged, and cannot play a heat insulation effect. In addition, this heat insulation structure cannot isolate the heat conduction between the contact surface of the positioning ring and the injection barrel in the circumferential direction. Since the positioning ring is fixedly installed on the barrel seat, the heat will be transmitted to the barrel seat through the positioning ring, resulting in faster heat dissipation, which cannot effectively reduce the heat loss of the injection barrel. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide an injection mechanism of an injection molding machine which has a simple structure and can effectively reduce the heat loss of an injection barrel.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] An injection mechanism of an injection molding machine includes an injection barrel and a barrel seat, wherein a concave positioning and mounting cavity is arranged in the barrel seat, and the injection barrel is positioned and mounted in the positioning and mounting cavity. An annular limiting ring is arranged on the injection barrel, and the annular limiting ring is arranged behind the front supporting wall of the barrel seat and fixedly connected to the front supporting wall of the barrel seat, and a heat insulation plate is arranged between the annular limiting ring and the front supporting wall of the barrel seat.

[0006] The outer wall of the annular limiting ring does not contact the inner wall of the positioning and installation cavity, which can further reduce the heat loss.

[0007] The heat insulation board is an annular structure, and is sleeved on the injection barrel. There is an annular gap between the inner wall of the heat insulation board and the outer wall of the injection barrel, and the outer wall of the heat insulation board does not contact the inner wall of the positioning and mounting cavity, which can further reduce heat loss.

[0008] The injection barrel is a two-stage structure, including a front barrel and a rear barrel. The rear end of the front barrel is provided with a circular first connecting flange, and the front end of the rear barrel is provided with a circular second connecting flange. The first connecting flange and the second connecting flange are butted to realize the connection between the front barrel and the rear barrel and form a limiting convex portion. The annular limiting ring is arranged between the limiting convex portion and the heat insulation board. The structure is simple, and the segmented barrel can be used for products made of magnesium alloy. The limiting convex portion is formed by butting the first connecting flange and the second connecting flange. The limiting convex portion constitutes a limiting structure for the installation of the injection barrel, which does not require additional setting and manufacturing, saving costs.

[0009] The barrel seat and the heat insulation board are pre-positioned and connected by pins, and the front support wall of the barrel seat, the heat insulation board, the annular limiting ring and the limiting convex part are locked and fixed by screws. The structure is simple, and the above-mentioned components are stably connected, and the assembly and disassembly are convenient.

[0010] The bottom end faces of the annular limiting ring and the heat insulation board are flat end faces, the bottoms of the two flat end faces are supported by a support plate, a vertical support screw is screwed and installed at the position of the bottom of the barrel seat corresponding to the support plate, and the rod end of the support screw is against the bottom of the support plate to form support. The support plate forms a stable support for the bottom of the annular limiting ring and the heat insulation board.

[0011] A bottom heat insulation board is arranged between the annular limiting ring, the bottom end surface of the heat insulation board and the support board, and the bottom heat insulation board is fixedly connected to the support board, thereby preventing heat from being lost from the support board and further reducing heat loss.

[0012] The support plate is provided with a supporting recess at a position corresponding to the supporting screw, and the end of the rod of the supporting screw is embedded in the supporting recess, so as to achieve stable support.

[0013] A positioning recess with an upper opening is recessed on the front support wall of the barrel seat, and the injection end of the injection barrel extends from the positioning recess and is arranged outside the barrel seat, so as to facilitate the installation of the injection barrel.

[0014] The positioning and installation cavity is provided with a positioning seat for positioning and supporting the tail end of the injection barrel. The tail of the injection barrel is arranged in the positioning seat. A pressure plate is detachably arranged on the positioning seat. The pressure plate is pressed above the tail of the injection barrel. The positioning seat is used to stably support the tail of the injection barrel, and the pressure plate is used to stably install the injection barrel in the barrel seat.

[0015] Compared with the prior art, the advantages of the utility model are: simple structure. First, the injection barrel is directly installed in the barrel seat. The front support wall of the barrel seat cooperates with the annular limit ring on the injection connection to limit the injection barrel. In the actual working process, the axial thrust borne by the injection barrel is directly transmitted to the barrel seat, and the barrel seat takes and digests the transmitted axial thrust. In this way, the heat insulation plate arranged between the front support wall of the barrel seat and the annular limit ring will not bend and deform, which effectively improves the service life. At the same time, the injection barrel is isolated from the barrel seat by the heat insulation plate, so that heat will not be transmitted to the barrel seat, effectively reducing the heat loss of the injection barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0018] Figure 3 This is a first cross-sectional structural schematic diagram of the utility model;

[0019] Figure 4 This is a second cross-sectional structural schematic diagram of the present utility model. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] As shown in the figure, an injection mechanism of an injection molding machine includes an injection barrel 1 and a barrel seat 2. A concave positioning and mounting cavity 21 is provided in the barrel seat 2. The injection barrel 1 is positioned and mounted in the positioning and mounting cavity 21. An annular limiting ring 3 is provided on the injection barrel 1. The annular limiting ring 3 is arranged behind the front supporting wall 22 of the barrel seat 2 and is fixedly connected to the front supporting wall 22 of the barrel seat 2. A heat insulation plate 4 is provided between the annular limiting ring 3 and the front supporting wall 22 of the barrel seat 2.

[0022] In this specific embodiment, the outer wall of the annular limiting ring 3 does not contact the inner wall of the positioning and mounting cavity 21, which can further reduce the heat loss.

[0023] In this specific embodiment, the heat insulation board 4 is an annular structure, and the heat insulation board 4 is sleeved on the injection barrel 1. There is an annular gap 41 between the inner wall of the heat insulation board 4 and the outer wall of the injection barrel 1, and the outer wall of the heat insulation board 4 does not contact the inner wall of the positioning installation cavity 21. The heat loss can be further reduced.

[0024] In this specific embodiment, the injection barrel 1 is a two-stage structure, including a front barrel 101 and a rear barrel 102. The rear end of the front barrel 101 is provided with a circular first connecting flange 11, and the front end of the rear barrel 102 is provided with a circular second connecting flange 12. The first connecting flange 11 and the second connecting flange 12 are butted to realize the connection between the front barrel 101 and the rear barrel 102 and form a limiting convex portion 103. The annular limiting ring 3 is arranged between the limiting convex portion 103 and the heat insulation board 4. The structure is simple, and the segmented barrel can be used for products made of magnesium alloy. The first connecting flange 11 and the second connecting flange 12 are butted to form the limiting convex portion 103. The limiting convex portion 103 constitutes a limiting structure for installing the injection barrel 1, and does not require additional setting and manufacturing, saving costs.

[0025] In this specific embodiment, the barrel seat 2 and the heat shield 4 are pre-positioned and connected by pins 15, and the front support wall 22 of the barrel seat 2, the heat shield 4, the annular limiting ring 3 and the limiting protrusion 103 are locked and fixed by screws 10. The structure is simple, and the above-mentioned components are stably connected, and the assembly and disassembly are convenient.

[0026] In this specific embodiment, the bottom end faces of the annular limiting ring 3 and the heat insulation plate 4 are flat end faces, and the bottoms of the two flat end faces are supported by a support plate 5. A vertical support screw 100 is screwed and installed at the position of the bottom of the barrel seat 2 corresponding to the support plate 5, and the rod end of the support screw 100 is against the bottom of the support plate 5 to form a support. The support plate 5 forms a stable support for the bottom of the annular limiting ring 3 and the heat insulation plate 4.

[0027] In this specific embodiment, a bottom heat insulation board 6 is arranged between the annular limiting ring 3 and the bottom end surface of the heat insulation board 4 and the support board 5, and the bottom heat insulation board 6 is fixedly connected to the support board 5. Preventing heat from being lost from the support board 5 can further reduce heat loss.

[0028] In this specific embodiment, a supporting recess 51 is provided on the supporting plate 5 at a position corresponding to the supporting screw 100, and the rod end of the supporting screw 100 is embedded in the supporting recess 51 to achieve stable support.

[0029] In this specific embodiment, a positioning recess 221 with an upper opening is recessed on the front support wall 22 of the cartridge seat 2, and the injection tip of the injection cartridge 1 extends from the positioning recess 221 and is disposed outside the cartridge seat 2, so as to facilitate the installation of the injection cartridge 1.

[0030] In this specific embodiment, a positioning seat 23 for positioning and supporting the tail end of the injection barrel 1 is provided in the positioning and installation cavity 21, and the tail of the injection barrel 1 is arranged in the positioning seat 23. A pressing plate 7 is detachably provided on the positioning seat 23, and the pressing plate 7 is pressed above the tail of the injection barrel 1. The positioning seat 23 is used to stably support the tail of the injection barrel 1, and the pressing plate 7 is used to realize the stable installation of the injection barrel 1 in the barrel seat 2.

Claims

1. An injection mechanism of an injection molding machine, comprising an injection barrel and a barrel seat, characterized in that A concave positioning and mounting cavity is provided in the barrel seat, and the injection barrel is positioned and mounted in the positioning and mounting cavity. An annular limiting ring is provided on the injection barrel, and the annular limiting ring is provided behind the front supporting wall of the barrel seat and fixedly connected to the front supporting wall of the barrel seat. A heat insulation plate is provided between the annular limiting ring and the front supporting wall of the barrel seat.

2. An injection mechanism of an injection molding machine as claimed in claim 1, characterized in that The outer wall of the annular limiting ring does not contact the inner wall of the positioning and mounting cavity.

3. An injection mechanism of an injection molding machine as claimed in claim 1, characterized in that The heat insulation plate is an annular structure, and is sleeved on the injection barrel. There is an annular gap between the inner wall of the heat insulation plate and the outer wall of the injection barrel, and the outer wall of the heat insulation plate does not contact the inner wall of the positioning and mounting cavity.

4. An injection mechanism of an injection molding machine as claimed in claim 1 or 3, characterized in that The injection barrel is a two-stage structure, including a front barrel and a rear barrel. The rear end of the front barrel is provided with a circular first connecting flange, and the front end of the rear barrel is provided with a circular second connecting flange. The first connecting flange and the second connecting flange are butt-jointed to realize the connection between the front barrel and the rear barrel and form a limiting protrusion. The annular limiting ring is arranged between the limiting protrusion and the heat insulation plate.

5. An injection mechanism of an injection molding machine as claimed in claim 4, characterized in that The barrel seat is pre-positioned and connected with the heat insulation plate by pins, and the front support wall of the barrel seat, the heat insulation plate, the annular limiting ring and the limiting protrusion are locked and fixed by screws.

6. An injection mechanism of an injection molding machine as claimed in claim 1, characterized in that The annular limit ring and the bottom end surface of the heat insulation plate are flat end surfaces, the bottoms of the two flat end surfaces are supported by a support plate, and a vertical support screw is screwed on the bottom of the barrel seat corresponding to the position of the support plate, and the rod end of the support screw is against the bottom of the support plate to form support.

7. An injection mechanism of an injection molding machine as claimed in claim 6, characterized in that A bottom heat insulation board is arranged between the annular limiting ring, the bottom end surface of the heat insulation board and the support board, and the bottom heat insulation board is fixedly connected to the support board.

8. An injection mechanism of an injection molding machine as claimed in claim 6 or 7, characterized in that A supporting recess is arranged on the supporting plate at a position corresponding to the supporting screw, and the end of the rod of the supporting screw is embedded in the supporting recess.

9. An injection mechanism of an injection molding machine as claimed in claim 1, characterized in that A positioning recess with an upper opening is recessed on the front support wall of the barrel seat, and the injection end of the injection barrel extends out from the positioning recess and is arranged outside the barrel seat.

10. An injection mechanism of an injection molding machine as claimed in claim 1, characterized in that A positioning seat for positioning and supporting the tail end of the injection barrel is arranged in the positioning installation cavity, the tail of the injection barrel is arranged in the positioning seat, and a pressure plate is detachably arranged on the positioning seat, and the pressure plate is pressed above the tail of the injection barrel.

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