An injection device

Abstract

The present invention provides an injection device, belonging to the field of injection molding technology, comprising: an injection cylinder, a rotary motor and a screw are sequentially arranged along the injection direction, wherein the injection cylinder comprises a cylinder body, a piston rod connected to the screw is built therein, and a wear-resistant belt and a flat key are arranged at one end of the piston rod connected to the screw; the rotary motor comprises a stator and a rotor arranged inside and outside, and a slide groove is arranged on the inner wall of the rotor to form a keyway with the flat key, and the slide groove runs through both ends of the rotor along the axis direction of the rotor, wherein the moving stroke of the flat key is the overall length in the axis direction of the rotor, and the linear movement of the screw is driven by the translation of the piston rod, and the piston rod and the screw are driven to rotate synchronously by the rotor. The present invention expands the injection stroke of the piston rod by increasing the moving stroke of the flat key, thereby increasing the single injection volume, thereby improving work efficiency, and ensuring the concentricity of the piston rod and the screw.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding and relates to an injection device. Background Art

[0002] The injection device includes a heating cylinder for heating the resin to melt it, a screw arranged in the heating cylinder so as to be rotatable and retractable, a metering motor for rotating the screw, and an injection motor for retracting the screw. The screw, metering motor, and injection motor are arranged on the same axis, so the inertia is small and the responsiveness is good.

[0003] The Chinese patent (CN111438903B) discloses an injection device, in which an annular gasket and a sliding ring are arranged at the same end of a coupling, and are separated from the rotor spline at both ends of the coupling, and the movement stroke of the coupling depends on the movement stroke of the rotor spline on the rotor. However, the movement stroke of the rotor spline in the patent is short, resulting in a small single injection volume, which affects work efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to provide an injection device that can increase the stroke and the single injection volume.

[0005] The object of the present invention can be achieved by the following technical solutions: an injection device, comprising:

[0006] An injection cylinder, a rotary motor and a screw are arranged in sequence along the injection direction, wherein:

[0007] The injection cylinder comprises a cylinder body, a piston rod connected to a screw rod is built therein, and a wear-resistant belt and a flat key are arranged on one end of the piston rod connected to the screw rod;

[0008] The rotating motor includes a stator and a rotor which are nested inside and outside, and a slide groove which cooperates with a flat key to form a keyway is provided on the inner wall of the rotor, and the slide groove passes through both ends of the rotor along the axial direction of the rotor, wherein the moving stroke of the flat key is the overall length in the axial direction of the rotor, and the linear movement of the screw is driven by the translation of the piston rod, and the piston rod and the screw are driven to rotate synchronously through the rotor.

[0009] In the above-mentioned injection device, the surface of the piston rod is provided with a first annular groove for installing a wear-resistant belt, and a strip groove for installing a flat key, and the length direction of the strip groove is consistent with the moving direction of the piston rod, wherein the first annular groove is divided into at least one arc groove by the strip groove.

[0010] In the above-mentioned injection equipment, the groove depth of the strip groove is greater than the groove depth of the arc groove. When the wear-resistant belt is embedded in the arc groove and the flat key is embedded in the strip groove, the upper surface of the wear-resistant layer is higher than the surface of the piston rod and fits with the inner surface of the rotor. The upper surface of the flat key is higher than the surface of the piston rod and is embedded in the slide groove, wherein there is a gap between the upper surface of the flat key and the bottom of the slide groove.

[0011] In the above-mentioned injection device, a second annular groove is provided on the end of the piston rod connected to the screw, and the second annular groove serves as the installation position of the dust ring, wherein an annular flange is provided on the dust ring, and when the dust ring is embedded in the second annular groove, the annular flange is higher than the surface of the piston rod and fits with the inner surface of the rotor.

[0012] The present invention also provides an injection device, comprising: an injection cylinder, a rotary motor and a screw are sequentially arranged along the injection direction, wherein:

[0013] The injection cylinder comprises a cylinder body, a piston rod is built therein, and the piston rod is connected to the screw rod through a coupling, wherein the coupling is provided with a wear-resistant belt and a flat key;

[0014] The rotating motor includes a stator and a rotor which are nested inside and outside, and a slide groove which cooperates with a flat key to form a keyway is arranged on the inner wall of the rotor, and the slide groove passes through both ends of the rotor along the axial direction of the rotor, wherein the moving stroke of the flat key is the overall length in the axial direction of the rotor, and the linear movement of the screw is driven by the translation of the piston rod, and the screw is driven to rotate through the rotor via a coupling.

[0015] In the above-mentioned injection equipment, the surface of the coupling is provided with a first annular groove for installing a wear-resistant belt, and a strip groove for installing a flat key, and the length direction of the strip groove is consistent with the moving direction of the coupling, wherein the first annular groove is divided into at least one arc groove by the strip groove.

[0016] In the above-mentioned injection equipment, the groove depth of the strip groove is greater than the groove depth of the arc groove. When the wear-resistant belt is embedded in the arc groove and the flat key is embedded in the strip groove, the upper surface of the wear-resistant layer is higher than the surface of the coupling and fits with the inner surface of the rotor. The upper surface of the flat key is higher than the surface of the coupling and is embedded in the slide groove, wherein there is a gap between the upper surface of the flat key and the bottom of the slide groove.

[0017] In the above-mentioned injection equipment, a push seat, a coupling sleeve and a motor push seat pad are arranged on the coupling in sequence along the injection direction, and a thrust spherical roller bearing is arranged between the push seat and the coupling sleeve. The coupling sleeve and the motor push seat pad are connected by fasteners, wherein one end of the piston rod forms a plug-in fit with the push seat and is inserted into the coupling sleeve, and the motor push seat pad is connected to the screw.

[0018] In the above-mentioned injection equipment, a plurality of bearings are arranged on one end of the piston rod which is inserted into the coupling sleeve through the push seat, which are tapered roller bearings and deep groove ball bearings, respectively. The tapered roller bearing is closer to the end of the piston rod than the deep groove ball bearing. The coupling sleeve is provided with a limiting step for limiting the axial movement of one side of the tapered roller bearing and the deep groove ball bearing, and the piston rod is nested with a limiting nut and a limiting retaining ring for limiting the axial movement of the other side of the tapered roller bearing and the deep groove ball bearing.

[0019] In the above-mentioned injection device, a piston ring is provided on the end of the piston rod away from the screw, and the piston ring and the piston rod are coaxially arranged, wherein the diameter of the piston ring is larger than the diameter of the piston rod, and a wear-resistant belt is embedded on the surface of the piston ring.

[0020] In the above-mentioned injection device, one end of the piston rod on which a piston ring is provided has a slot along the axial direction of the piston rod, and an electronic caliper is provided on the cylinder body, wherein one end of the electronic caliper is located outside the cylinder body, and the other end of the electronic caliper is inserted into the slot, and the moving stroke of the piston rod can be accurately calculated by the electronic caliper.

[0021] In the above-mentioned injection device, the notch of the slot is recessed to form a second cavity, and a retaining portion for keeping the electronic caliper coaxially arranged with the piston ring is embedded in the second cavity, wherein one end of the electronic caliper that is plug-fitted with the piston ring is plug-fitted with the retaining portion.

[0022] In the above-mentioned injection device, the piston rod and the screw are locked by a clamp structure, and a first limiting portion and a second limiting portion are respectively provided between the clamp structure and the piston rod and the screw, and the first limiting portion limits the degree of freedom of the clamp structure and the piston rod in the axial direction, and the second limiting portion limits the degree of freedom of the clamp structure and the screw in the axial direction;

[0023] In the above-mentioned injection equipment, the coupling and the screw are locked together by the clamp structure, and the first limiting portion and the second limiting portion are respectively provided between the clamp structure and the coupling and the screw. The first limiting portion limits the degree of freedom of the clamp structure and the coupling in the axial direction, and the second limiting portion limits the degree of freedom of the clamp structure and the screw in the axial direction.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The injection device provided by the present invention increases the injection stroke of the piston rod by increasing the moving stroke of the flat key, thereby increasing the single injection volume, thereby improving work efficiency and ensuring the concentricity of the piston rod and the screw. In addition, no coupling is provided between the piston rod, the rotor and the screw, thereby reducing the weight of the entire device, making the connection between the various components simpler and more reliable, and reducing the rotational inertia and injection inertia of the device;

[0026] (2) By overlapping the strip groove and the first annular groove, the wear-resistant belt and the flat key are integrated at one end of the piston rod, shortening the relative distance between the wear-resistant belt and the flat key, further increasing the moving stroke of the flat key, thereby expanding the injection stroke of the piston rod;

[0027] (3) The wear-resistant belt prevents the surface of the piston rod from contacting the inner surface of the rotor, thereby reducing the wear of the piston rod and the rotor. The flat key is used as a guide structure for the piston rod during movement to ensure the straightness of the piston rod during translation. In addition, the groove depth of the strip groove is greater than the groove depth of the arc groove, so that the two ends of the wear-resistant belt embedded in the arc groove are respectively clamped between two adjacent flat keys, and the two ends of the wear-resistant belt are respectively in contact with the surfaces of the corresponding two flat keys, ensuring that there is no relative sliding between the piston rod and the wear-resistant belt when the piston rod rotates;

[0028] (4) By providing a dustproof ring, and the annular flange on the dustproof ring fits against the inner surface of the rotor, it can block the dust brought by the "suction" generated by the piston rod during the reciprocating movement, and prevent the dust from adhering to the surface of the wear-resistant belt and causing wear on the inner surface of the rotor, thereby improving the service life of the equipment;

[0029] (5) The electronic caliper can accurately calculate the travel of the piston rod, thereby accurately calculating the extrusion amount of the material;

[0030] (6) By setting a thrust spherical roller bearing, the piston rod is self-centering when connected to the coupling, ensuring that the piston rod, coupling and screw are coaxially arranged. In addition, a limit step is provided on the piston rod to form an abutment with the push seat, so as to control the depth of the piston rod extending into the coupling sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an injection device of the present invention.

[0032] Figure 2 It is a cross-sectional view of an injection device of the present invention.

[0033] Figure 3 yes Figure 2 Enlarged view of part A.

[0034] Figure 4 yes Figure 2 Enlarged view of part B.

[0035] Figure 5 It is a structural schematic diagram of a piston rod in a preferred embodiment of the present invention.

[0036] Figure 6 It is a schematic diagram of the partial structure of the piston rod in a preferred embodiment of the present invention.

[0037] Figure 7 It is a structural schematic diagram of a clamp structure in a preferred embodiment of the present invention.

[0038] Figure 8 It is a structural schematic diagram of a rotating motor in a preferred embodiment of the present invention.

[0039] Fig. 9 It is a schematic structural diagram of another embodiment of an injection device of the present invention.

[0040] Fig.10 yes Fig. 9 A cross-sectional view of the injection device shown.

[0041] Fig.11 yes Fig.10 Magnified view of part C.

[0042] Fig.12 yes Fig.10 Enlarged view of part D.

[0043] Fig.13 yes Fig. 9 Schematic diagram of the structure of the coupling.

[0044] Fig.14 yes Fig. 9 Schematic diagram of the partial structure of the middle coupling.

[0045] In the figure, 10, injection cylinder; 11, cylinder body; 111, storage chamber; 112, rear end cover; 113, front end cover; 12, piston rod; 121, strip groove; 122, arc groove; 123, second annular groove; 124, annular protrusion; 125, slot; 126, second concave cavity; 127, first concave cavity; 13, wear-resistant belt; 14, flat key; 15, dust ring; 151, annular flange; 16, piston ring; 17, piston sealing ring; 18, electronic caliper; 19, retaining part;

[0046] 20. Rotating motor; 21. Stator; 22. Rotor; 221. Slideway;

[0047] 30. screw rod; 31. annular boss;

[0048] 40. Clamp structure; 41. Mounting cavity; 42. First through hole; 43. Second through hole; 44. Block;

[0049] 50. injection seat; 51. cavity;

[0050] 60. Coupling; 61. Push seat; 62. Coupling sleeve; 621. Limit step; 63. Motor push seat pad; 64. Thrust spherical roller bearing; 65. Tapered roller bearing; 66. Deep groove ball bearing; 67. Limit nut. DETAILED DESCRIPTION

[0051] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0052] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. Embodiment 1

[0053] like Figures 1 to 8 As shown, the present invention provides an injection device, comprising:

[0054] An injection cylinder 10, a rotary motor 20 and a screw 30 are sequentially arranged along the injection direction, wherein:

[0055] The injection cylinder 10 includes a cylinder body 11, a piston rod 12 connected to the screw rod 30 is built therein, and a wear-resistant belt 13 and a flat key 14 are arranged on one end of the piston rod 12 connected to the screw rod 30;

[0056] The rotating electric machine 20 includes a stator 21 and a rotor 22 which are nested inside and outside, and a slide groove 221 which cooperates with the flat key 14 to form a keyway is provided on the inner wall of the rotor 22, and the slide groove 221 passes through both ends of the rotor 22 along the axis direction of the rotor 22, so that the moving stroke of the flat key 14 is the entire length of the rotor 22 in the axis direction;

[0057] The screw rod 30 is driven to move linearly by the translation of the piston rod 12 , and the piston rod 12 and the screw rod 30 are driven to rotate synchronously by the rotor 22 .

[0058] The present invention provides an injection device, which increases the injection stroke of the piston rod 12 by increasing the moving stroke of the flat key 14, thereby increasing the single injection volume, thereby improving work efficiency and ensuring the concentricity of the piston rod 12 and the screw 30. In addition, no coupling 60 is provided between the piston rod 12, the rotor 22 and the screw 30, which reduces the weight of the entire device, makes the connection between the various components simpler and more reliable, and reduces the rotational inertia and injection inertia of the device.

[0059] In addition, the single oil cylinder structure for injection of the present invention uses electric melting of glue, which is more in line with actual application scenarios.

[0060] Preferably, the surface of the piston rod 12 is provided with a first annular groove for installing the wear-resistant belt 13, and a strip groove 121 for installing the flat key 14, and the length direction of the strip groove 121 is consistent with the moving direction of the piston rod 12, wherein the first annular groove is divided into at least one arc groove 122 by the strip groove 121.

[0061] In this embodiment, by overlapping the strip groove 121 and the first annular groove, the wear-resistant belt 13 and the flat key 14 are integrated at one end of the piston rod 12, thereby shortening the relative distance between the wear-resistant belt 13 and the flat key 14 and further increasing the moving stroke of the flat key 14, thereby expanding the injection stroke of the piston rod 12.

[0062] It is worth mentioning that there are four strip grooves 121, and the four strip grooves 121 are distributed in a ring shape on the surface of the piston rod 12, wherein the angle between any two adjacent strip grooves 121 is the same, and the first annular groove is divided into four arc grooves 122 of equal arc length by the four strip grooves 121.

[0063] It is further pointed out that the groove depth of the strip groove 121 is greater than the groove depth of the arc groove 122. When the wear-resistant belt 13 is embedded in the arc groove 122 and the flat key 14 is embedded in the strip groove 121, the upper surface of the wear-resistant layer is higher than the surface of the piston rod 12 and fits with the inner surface of the rotor 22. The upper surface of the flat key 14 is higher than the surface of the piston rod 12 and is embedded in the slide groove 221, wherein there is a gap between the upper surface of the flat key 14 and the bottom of the slide groove 221.

[0064] In this embodiment, the wear-resistant belt 13 is used to prevent the surface of the piston rod 12 from contacting the inner surface of the rotor 22, thereby reducing the wear of the piston rod 12 and the rotor 22. The flat key 14 is used as a guiding structure for the piston rod 12 during movement to ensure the straightness of the piston rod 12 during translation. In addition, the groove depth of the strip groove 121 is greater than the groove depth of the arc groove 122, so that the two ends of the wear-resistant belt 13 embedded in the arc groove 122 are respectively clamped between two adjacent flat keys 14, and the two ends of the wear-resistant belt 13 are respectively abutted against the surfaces of the corresponding two flat keys 14, ensuring that there is no relative sliding between the piston rod 12 and the wear-resistant belt 13 during rotation.

[0065] Preferably, a second annular groove 123 is provided on the end of the piston rod 12 connected to the screw 30, and the second annular groove 123 serves as the installation position of the dust ring 15, wherein an annular flange 151 is provided on the dust ring 15, and when the dust ring 15 is embedded in the second annular groove 123, the annular flange 151 is higher than the surface of the piston rod 12 and fits with the inner surface of the rotor 22.

[0066] In this embodiment, by providing a dust ring 15, and the annular flange 151 on the dust ring 15 is in contact with the inner surface of the rotor 22, it is possible to block the dust brought by the "suction force" generated by the piston rod 12 during the reciprocating movement, and prevent dust from adhering to the surface of the wear-resistant belt 13 and causing wear on the inner surface of the rotor 22, thereby improving the service life of the equipment.

[0067] Preferably, the piston rod 12 and the screw rod 30 are locked by a clamp structure 40 to ensure the coaxiality between the piston rod 12 and the screw rod 30 and enable synchronous rotation and movement between the piston rod 12 and the screw rod 30, wherein the clamp structure 40 is respectively provided with a first limiting portion and a second limiting portion between the piston rod 12 and the screw rod 30, wherein the first limiting portion limits the degree of freedom of the clamp structure 40 and the piston rod 12 in the axial direction, and the second limiting portion limits the degree of freedom of the clamp structure 40 and the screw rod 30 in the axial direction.

[0068] It is worth mentioning that an installation cavity 41 is provided in the clamp structure 40, and a first through hole 42 which is nested and matched with the piston rod 12 is provided on one side of the installation cavity 41, and a second through hole 43 which is nested and matched with the screw 30 is provided on the other side of the installation cavity 41, wherein an annular protrusion 124 is provided on the piston rod 12, and an annular boss 31 is provided on the screw 30, and the annular protrusion 124 is snap-fitted with a cavity wall on one side of the installation cavity 41 where the first through hole 42 is provided to form a first limiting portion, and the annular boss 31 is snap-fitted with a cavity wall on one side of the installation cavity 41 where the second through hole 43 is provided to form a second limiting portion.

[0069] Further preferably, the annular boss 31 passes through the first through hole 42 and is inserted into the first concave cavity 127 on the piston rod 12 that matches the first concave cavity 127 .

[0070] In the present embodiment, the first limiting portion and the second limiting portion both achieve the limitation in the axial direction between the clamp structure 40 and the piston rod 12, and between the clamp structure 40 and the screw 30 through a snap fit, wherein one side of the annular protrusion 124 forms a snap fit with one side wall of the mounting cavity 41, the other side of the annular protrusion 124 forms an abutment fit with the other side wall of the mounting cavity 41 (the side wall that forms a snap fit with the annular boss 31), one side of the annular boss 31 forms a snap fit with one side wall of the mounting cavity 41, and the other side of the annular boss 31 forms an abutment fit with the bottom of the first concave cavity 127, thereby ensuring that during the reciprocating movement of the piston rod 12, no relative movement occurs between the piston rod 12 and the screw 30, thereby being able to accurately calculate the movement of the screw 30 and the extrusion amount of the material.

[0071] Preferably, the clamp structure 40 includes two clamping blocks 44 connected in an embracing manner, and the two clamping blocks 44 are locked by fasteners, wherein the first through hole 42, the second through hole 43 and a part of the installation cavity 41 are arranged on one of the clamping blocks 44, and the first through hole 42, the second through hole 43 and another part of the installation cavity 41 are arranged on the other clamping block 44. It is further pointed out that the first through hole 42, the second through hole 43 and the installation cavity 41 are symmetrically arranged on the two clamping blocks 44.

[0072] Preferably, a piston ring 16 is provided at the other end of the piston rod 12 (the end away from the screw rod 30 ), and the piston ring 16 is coaxially arranged with the piston rod 12 , wherein the diameter of the piston ring 16 is larger than the diameter of the piston rod 12 , and a wear-resistant belt 13 is also embedded on the surface of the piston ring 16 .

[0073] It is worth mentioning that two wear-resistant belts 13 arranged side by side are embedded on the surface of one end of the piston rod 12 connected to the screw 30, and two wear-resistant belts 13 arranged side by side are also embedded on the surface of the piston ring 16, wherein a piston sealing ring 17 is arranged between the two wear-resistant belts 13 on the piston ring 16, and the piston sealing ring 17 and the piston ring 16 are nested.

[0074] It is further pointed out that the surface of the wear-resistant belt 13 on the piston ring 16 is also higher than the surface of the piston ring 16 and fits with the inner surface of the cylinder body 11. The surface of the piston sealing ring 17 is also higher than the surface of the piston ring 16 and fits with the inner surface of the cylinder body 11. In this embodiment, the wear-resistant ring on the piston ring 16 not only improves the wear resistance between the piston ring 16 and the cylinder body 11, but also cooperates with the piston sealing ring 17 to avoid oil leakage in the cylinder.

[0075] Preferably, one end of a piston ring 16 is provided on the piston rod 12 and a slot 125 is provided along the axial direction of the piston rod 12, and an electronic caliper 18 is provided on the cylinder body 11, wherein one end of the electronic caliper 18 is located outside the cylinder body 11, and the other end of the electronic caliper 18 is inserted into the slot 125. The electronic caliper 18 can accurately calculate the moving stroke of the piston rod 12, thereby accurately calculating the extrusion amount of the material.

[0076] In this embodiment, the embedded electronic caliper structure inside the injection cylinder realizes high-precision feedback even when the measured end of the injection stroke rotates.

[0077] It is worth mentioning that a storage chamber 111 for storing oil is provided in the cylinder body 11, and the storage chamber 111 runs through both ends of the cylinder body 11, and end covers are respectively connected to the two ends of the cylinder body 11, namely the rear end cover 112 and the front end cover 113, wherein one end of the electronic caliper 18 is installed on the rear end cover 112, and the other end of the electronic caliper 18 runs through the rear end cover 112 and is inserted into the slot 125.

[0078] Further preferably, the notch of the slot 125 is recessed to form a second cavity 126, and a retaining portion 19 for keeping the electronic caliper 18 coaxially arranged with the piston ring 16 is embedded in the second cavity 126, wherein one end of the electronic caliper 18 that is plug-fitted with the piston ring 16 is plug-fitted with the retaining portion 19.

[0079] It is worth mentioning that the retaining portion 19 is a magnetic ring, which is connected to the bottom of the second cavity 126 through a fastener, wherein the magnetic ring is coaxially arranged with one end of the electronic caliper 18 inserted into the magnetic ring, thereby improving the accuracy of the electronic caliper 18 in measuring the travel of the piston rod 12.

[0080] Preferably, an injection seat 50 is also included, and a hollow cavity 51 is provided in the injection seat 50, wherein the rotating motor 20 is located in the cavity 51, the injection cylinder 10 is located outside the cavity 51, and the stator 21 in the rotating motor 20 is connected to the injection seat 50, and the cylinder body 11 of the injection cylinder 10 is connected to the injection seat 50. Embodiment 2

[0081] like Figures 9 to 14 As shown, an injection device provided by the present invention comprises: an injection cylinder 10, a rotary motor 20 and a screw 30 are sequentially arranged along the injection direction, wherein:

[0082] The injection cylinder 10 includes a cylinder body 11, a piston rod 12 is built therein, and the piston rod 12 is connected to the screw 30 through a coupling 60, wherein the coupling 60 is provided with a wear-resistant belt 13 and a flat key 14;

[0083] The rotating electric machine 20 includes a stator 21 and a rotor 22 which are nested inside and outside, and a slide groove 221 which cooperates with the flat key 14 to form a keyway is provided on the inner wall of the rotor 22, and the slide groove 221 passes through both ends of the rotor 22 along the axis direction of the rotor 22, so that the moving stroke of the flat key 14 is the entire length of the rotor 22 in the axis direction;

[0084] The screw rod 30 is driven to move linearly by the translation of the piston rod 12 , and the screw rod 30 is driven to rotate by the rotor 22 via the coupling 60 .

[0085] The injection device provided by the present invention increases the injection stroke of the piston rod 12 by increasing the stroke of the flat key 14, thereby increasing the single injection volume, thereby improving work efficiency and ensuring the concentricity of the piston rod 12 and the screw 30.

[0086] Preferably, the surface of the coupling 60 is provided with a first annular groove for installing the wear-resistant belt 13, and a strip groove 121 for installing the flat key 14, and the length direction of the strip groove 121 is consistent with the moving direction of the coupling 60, wherein the first annular groove is divided into at least one arc groove 122 by the strip groove 121.

[0087] In this embodiment, by overlapping the strip groove 121 and the first annular groove, the wear-resistant belt 13 and the flat key 14 are integrated at one end of the coupling 60, shortening the relative distance between the wear-resistant belt 13 and the flat key 14, and further increasing the moving stroke of the flat key 14, thereby expanding the injection stroke of the piston rod 12.

[0088] It is worth mentioning that there are four strip grooves 121, and the four strip grooves 121 are distributed in a ring shape on the surface of the coupling 60, wherein the angle between any two adjacent strip grooves 121 is the same, and the first annular groove is divided into four arc grooves 122 of equal arc length by the four strip grooves 121.

[0089] It is further pointed out that the groove depth of the strip groove 121 is greater than the groove depth of the arc groove 122. When the wear-resistant belt 13 is embedded in the arc groove 122 and the flat key 14 is embedded in the strip groove 121, the upper surface of the wear-resistant layer is higher than the surface of the coupling 60 and fits with the inner surface of the rotor 22. The upper surface of the flat key 14 is higher than the surface of the coupling 60 and is embedded in the slide groove 221, wherein there is a gap between the upper surface of the flat key 14 and the bottom of the slide groove 221.

[0090] In this embodiment, the wear-resistant belt 13 is used to prevent the surface of the coupling 60 from contacting the inner surface of the rotor 22, thereby reducing the wear of the coupling 60 and the rotor 22. The flat key 14 is used as a guiding structure for the coupling 60 during movement to ensure the straightness of the coupling 60 during translation, thereby ensuring the straightness of the piston rod 12 and the screw 30 during translation. In addition, the groove depth of the strip groove 121 is greater than the groove depth of the arc groove 122, so that the two ends of the wear-resistant belt 13 embedded in the arc groove 122 are respectively clamped between two adjacent flat keys 14, and the two ends of the wear-resistant belt 13 are respectively abutted against the surfaces of the corresponding two flat keys 14, thereby ensuring that there is no relative sliding between the coupling 60 and the wear-resistant belt 13 during rotation.

[0091] Preferably, a push seat 61, a coupling sleeve 62 and a motor push seat pad 63 are sequentially arranged on the coupling 60 along the injection direction, and a thrust spherical roller bearing 64 is arranged between the push seat 61 and the coupling sleeve 62, and the coupling sleeve 62 and the motor push seat pad 63 are connected by fasteners, wherein one end of the piston rod 12 forms a plug-in fit with the push seat 61 and is inserted into the coupling sleeve 62, and the motor push seat pad 63 is connected to the screw 30.

[0092] In this embodiment, a thrust spherical roller bearing 64 is provided to realize self-centering when the piston rod 12 is connected to the coupling 60, so as to ensure that the piston rod 12, the coupling 60 and the screw 30 are coaxially arranged. In addition, a limiting step 621 is provided on the piston rod 12 to form an abutment with the push seat 61, so as to control the depth of the piston rod 12 extending into the coupling sleeve 62.

[0093] Further preferably, a plurality of bearings are provided on one end of the piston rod 12 which is inserted into the coupling sleeve 62 through the push seat 61, which are respectively a tapered roller bearing 65 and a deep groove ball bearing 66, and the tapered roller bearing 65 is closer to the end of the piston rod 12 than the deep groove ball bearing 66, wherein a limiting step 621 is provided on the coupling sleeve 62 for limiting the axial movement of one side of the tapered roller bearing 65 and the deep groove ball bearing 66, and a limiting nut 67 and a limiting retaining ring (not shown in the figure) are nested on the piston rod 12 for limiting the axial movement of the other side of the tapered roller bearing 65 and the deep groove ball bearing 66.

[0094] In this embodiment, when the rotor 22 drives the screw 30 to rotate axially through the coupling sleeve 62, the piston rod 12 does not rotate synchronously. Therefore, in order to ensure that the coupling sleeve 62 rotates smoothly under the action of the rotor 22, a deep groove ball bearing 66 and a tapered roller bearing 65 are arranged between the piston rod 12 and the connecting sleeve. In order to limit the axial freedom of the deep groove ball bearing 66 and the tapered roller bearing 65, a limit step 621, a limit nut 67 and a limit retaining ring are provided.

[0095] Preferably, the motor push seat pad 63 and the screw rod 30 are locked by a clamp structure 40 to ensure the coaxiality between the motor push seat pad 63 and the screw rod 30 and enable the motor push seat pad 63 and the screw rod 30 to rotate and move synchronously.

[0096] It is worth mentioning that the connection method between the motor push seat pad 63 and the screw rod 30 in this embodiment is consistent with the connection method between the piston rod 12 and the screw rod 30 in the first embodiment, so it will not be described in detail here.

[0097] Preferably, a piston ring 16 is provided at the other end of the piston rod 12 (the end away from the screw rod 30 ), and the piston ring 16 is coaxially arranged with the piston rod 12 , wherein the diameter of the piston ring 16 is larger than the diameter of the piston rod 12 , and a wear-resistant belt 13 is also embedded on the surface of the piston ring 16 .

[0098] It is worth mentioning that two wear-resistant belts 13 arranged side by side are embedded on the surface of one end of the piston rod 12 connected to the screw 30, and two wear-resistant belts 13 arranged side by side are also embedded on the surface of the piston ring 16, wherein a piston sealing ring 17 is arranged between the two wear-resistant belts 13 on the piston ring 16, and the piston sealing ring 17 and the piston ring 16 are nested.

[0099] It is further pointed out that the surface of the wear-resistant belt 13 on the piston ring 16 is also higher than the surface of the piston ring 16 and fits with the inner surface of the cylinder body 11. The surface of the piston sealing ring 17 is also higher than the surface of the piston ring 16 and fits with the inner surface of the cylinder body 11. In this embodiment, the wear-resistant ring on the piston ring 16 not only improves the wear resistance between the piston ring 16 and the cylinder body 11, but also cooperates with the piston sealing ring 17 to avoid oil leakage in the cylinder.

[0100] Preferably, one end of a piston ring 16 is provided on the piston rod 12 and a slot 125 is provided along the axial direction of the piston rod 12, and an electronic caliper 18 is provided on the cylinder body 11, wherein one end of the electronic caliper 18 is located outside the cylinder body 11, and the other end of the electronic caliper 18 is inserted into the slot 125. The electronic caliper 18 can accurately calculate the moving stroke of the piston rod 12, thereby accurately calculating the extrusion amount of the material.

[0101] It is worth mentioning that a storage chamber 111 for storing oil is provided in the cylinder body 11, and the storage chamber 111 runs through both ends of the cylinder body 11, and end covers are respectively connected to the two ends of the cylinder body 11, namely the rear end cover 112 and the front end cover 113, wherein one end of the electronic caliper 18 is installed on the rear end cover 112, and the other end of the electronic caliper 18 runs through the rear end cover 112 and is inserted into the slot 125.

[0102] Further preferably, the notch of the slot 125 is recessed to form a second cavity 126, and a retaining portion 19 for keeping the electronic caliper 18 coaxially arranged with the piston ring 16 is embedded in the second cavity 126, wherein one end of the electronic caliper 18 that is plug-fitted with the piston ring 16 is plug-fitted with the retaining portion 19.

[0103] It is worth mentioning that the retaining portion 19 is a magnetic ring, which is connected to the bottom of the second cavity 126 through a fastener, wherein the magnetic ring is coaxially arranged with one end of the electronic caliper 18 inserted into the magnetic ring, thereby improving the accuracy of the electronic caliper 18 in measuring the travel of the piston rod 12.

[0104] Preferably, an injection seat 50 is also included, and a hollow cavity 51 is provided in the injection seat 50, wherein the rotating motor 20 is located in the cavity 51, the injection cylinder 10 is located outside the cavity 51, and the stator 21 in the rotating motor 20 is connected to the injection seat 50, and the cylinder body 11 of the injection cylinder 10 is connected to the injection seat 50.

[0105] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0106] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0107] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An injection device, characterized in that include: An injection cylinder, a rotary motor and a screw are arranged in sequence along the injection direction, wherein: The injection cylinder comprises a cylinder body, a piston rod connected to a screw rod is built therein, and a wear-resistant belt and a flat key are arranged on one end of the piston rod connected to the screw rod; The rotary motor comprises a stator and a rotor which are nested inside and outside, and a slide groove which cooperates with a flat key to form a keyway is arranged on the inner wall of the rotor, and the slide groove runs through both ends of the rotor along the axis direction of the rotor, wherein the moving stroke of the flat key is the overall length in the axis direction of the rotor, and the linear movement of the screw is driven by the translation of the piston rod, and the piston rod and the screw are driven to rotate synchronously through the rotor; The surface of the piston rod is provided with a first annular groove for installing a wear-resistant belt and a strip groove for installing a flat key, and the length direction of the strip groove is consistent with the moving direction of the piston rod, wherein the first annular groove is divided into at least one arc groove by the strip groove; The groove depth of the strip groove is greater than that of the arc groove. When the wear-resistant belt is embedded in the arc groove and the flat key is embedded in the strip groove, the upper surface of the wear-resistant layer is higher than the surface of the piston rod and fits with the inner surface of the rotor. The upper surface of the flat key is higher than the surface of the piston rod and embedded in the slide groove. There is a gap between the upper surface of the flat key and the bottom of the slide groove. There are four strip grooves, and the four strip grooves are distributed in an annular shape on the surface of the piston rod, wherein the angle between any two adjacent strip grooves is the same, and the first annular groove is divided into four arc grooves of equal arc length by the four strip grooves; The two ends of the wear-resistant belt embedded in the arc-shaped groove are respectively clamped between two adjacent flat keys, and the two ends of the wear-resistant belt are respectively in contact with the surfaces of the corresponding two flat keys.

2. An injection device according to claim 1, characterized in that: A second annular groove is provided on one end of the piston rod connected to the screw rod, and the second annular groove serves as the installation position of the dust ring, wherein an annular flange is provided on the dust ring. When the dust ring is embedded in the second annular groove, the annular flange is higher than the surface of the piston rod and fits with the inner surface of the rotor.

3. An injection device according to claim 1, characterized in that: A piston ring is arranged on one end of the piston rod away from the screw rod, and the piston ring and the piston rod are arranged coaxially, wherein the diameter of the piston ring is larger than the diameter of the piston rod, and a wear-resistant belt is embedded on the surface of the piston ring.

4. An injection device according to claim 3, characterized in that: One end of the piston rod is provided with a piston ring and a slot is provided along the axial direction of the piston rod, and an electronic caliper is provided on the cylinder body, wherein one end of the electronic caliper is located outside the cylinder body and the other end of the electronic caliper is inserted into the slot, and the moving stroke of the piston rod can be accurately calculated by the electronic caliper.

5. An injection device according to claim 4, characterized in that: The slot is recessed at the notch to form a second cavity, and a retaining portion for keeping the electronic caliper coaxially arranged with the piston ring is embedded in the second cavity, wherein one end of the electronic caliper plug-fitted with the piston ring is plug-fitted with the retaining portion.

6. An injection device, characterized in that: include: An injection cylinder, a rotary motor and a screw are arranged in sequence along the injection direction, wherein: The injection cylinder comprises a cylinder body, a piston rod is built therein, and the piston rod is connected to the screw rod through a coupling, wherein the coupling is provided with a wear-resistant belt and a flat key; The rotary motor comprises a stator and a rotor which are nested inside and outside, and a slide groove which cooperates with a flat key to form a keyway is arranged on the inner wall of the rotor, and the slide groove runs through both ends of the rotor along the axis direction of the rotor, wherein the moving stroke of the flat key is the overall length in the axis direction of the rotor, and the linear movement of the screw is driven by the translation of the piston rod, and the screw is driven to rotate through the rotor via the coupling; The surface of the coupling is provided with a first annular groove for installing the wear-resistant belt and a strip groove for installing the flat key, and the length direction of the strip groove is consistent with the moving direction of the coupling, wherein the first annular groove is divided into at least one arc groove by the strip groove; The groove depth of the strip groove is greater than that of the arc groove. When the wear-resistant belt is embedded in the arc groove and the flat key is embedded in the strip groove, the upper surface of the wear-resistant layer is higher than the surface of the coupling and fits with the inner surface of the rotor. The upper surface of the flat key is higher than the surface of the coupling and embedded in the slide groove. There is a gap between the upper surface of the flat key and the bottom of the slide groove. There are four strip grooves, and the four strip grooves are distributed in an annular shape on the surface of the coupling, wherein the angle between any two adjacent strip grooves is the same, and the first annular groove is divided into four arc grooves of equal arc length by the four strip grooves; The two ends of the wear-resistant belt embedded in the arc-shaped groove are respectively clamped between two adjacent flat keys, and the two ends of the wear-resistant belt are respectively in contact with the surfaces of the corresponding two flat keys.

7. An injection device according to claim 6, characterized in that: A push seat, a coupling sleeve and a motor push seat pad are arranged on the coupling in sequence along the injection direction, and a thrust spherical roller bearing is arranged between the push seat and the coupling sleeve. The coupling sleeve and the motor push seat pad are connected by fasteners, wherein one end of the piston rod forms a plug-in fit with the push seat and is inserted into the coupling sleeve, and the motor push seat pad is connected to the screw.

8. An injection device according to claim 7, characterized in that: A plurality of bearings are arranged on one end of the piston rod which is inserted into the coupling sleeve through the push seat, which are tapered roller bearings and deep groove ball bearings. The tapered roller bearing is closer to the end of the piston rod than the deep groove ball bearing. A limiting step is arranged on the coupling sleeve for limiting the axial movement of one side of the tapered roller bearing and the deep groove ball bearing, and a limiting nut and a limiting retaining ring are nested on the piston rod for limiting the axial movement of the other side of the tapered roller bearing and the deep groove ball bearing.

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