Injection mold for utility knife shell

Abstract

The invention discloses an injection mold for a utility knife shell, relates to the technical field of utility knife shell injection molding, and aims to solve the technical problem of the single function of the injection mold for the utility knife shell, including an upper module, a lower module, a rotating groove, a rotating column, a rotating shaft, an intermittent rotating mechanism, a lifting mechanism, a forward rotating mechanism, and a reverse rotating mechanism. The invention provides a rotating column, and respectively provides a handle injection molding half groove, a knife shell injection molding half groove, an adjustment block injection molding half groove, and a tail block injection molding half groove on four injection molding surfaces of the rotating column, so that two handle injection molding half grooves, two knife shell injection molding half grooves, two adjustment block injection molding half grooves, and two tail block injection molding half grooves respectively located on the upper module and the lower module constitute a handle injection molding cavity, a knife shell injection molding cavity, an adjustment block injection molding cavity, and a tail block injection molding cavity, and through the intermittent rotating mechanism adjustment, the device can perform injection molding on all parts of the utility knife shell, thereby improving the functionality of the utility knife shell injection mold.

Description

Technical Field

[0001] The invention relates to the technical field of utility knife shell injection molding, and more specifically, to an injection molding mold for a utility knife shell. Background Art

[0002] Utility knife, also known as carving knife or wallpaper knife, is a kind of knife used for art and handicrafts. It is mainly used to cut soft things. It is mostly composed of shell and blade, and is a pull-out structure. There are also a few with metal handles. The blade is mostly beveled. It can be broken along the line of the blade body when blunt, and a new blade will appear, which is convenient for use.

[0003] The shell is also called the plastic knife handle 01, which is mostly produced by injection molding. The existing utility knife shell structure is as follows Figure 1 As shown, it includes a knife handle 01, a knife shell 02, an adjusting block 03 and a tail block 04. A knife groove 05 is opened on the tail block 04. When the blade is blunt, the tail block 04 can be taken out, and the knife groove 05 is inserted into the blade to assist the blade to break. It can be seen that when producing a utility knife, it is necessary to separately injection mold the knife handle 01, the knife shell 02, the adjusting block 03 and the tail block 04 and then assemble them. However, most of the existing injection molds can only inject a single part with a single function. When producing a utility knife, four sets of injection molds are required, resulting in high production costs. In addition, the replacement of the mold also takes time, which affects the production efficiency. In view of this, we propose an injection mold for the outer shell of a utility knife. Summary of the invention

[0004] The purpose of the present invention is to provide an injection mold for a utility knife shell to solve the technical problem that the injection mold for the utility knife shell has a single function.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an injection mold for a utility knife shell, comprising an upper module and a lower module, wherein the upper module and the lower module are provided with rotation grooves at opposite ends, the rotation grooves are rotatably connected to a rotating column, a rotating shaft is fixed on the rotating column, the rotating shaft is rotatably connected to the rotation grooves, the rotating column is provided with four injection molding surfaces in an indirect structure with equal spacing in a ring, the four injection molding surfaces are respectively provided with a handle injection molding half groove, a knife shell injection molding half groove, an adjustment block injection molding half groove and a tail block injection molding half groove, a feeding port is provided at the top end of one side of the lower module, the handle injection molding half groove, the knife shell injection molding half groove, the adjustment block injection molding half groove and the tail block injection molding half groove on the lower module are all connected and coordinated with the feeding port, and an intermittent rotation mechanism is provided at one end of the upper module and the lower module away from the feeding port;

[0006] Among them, the intermittent rotating mechanism located on the upper module is fixedly connected to the rotating column located on the upper module, a lifting mechanism is arranged in the rotating column located on the lower module, the input end of the lifting mechanism is located on the intermittent rotating mechanism output end of the lower module and is fixedly connected, the lower module is provided with a mounting circular groove relative to the output end of the lifting mechanism, a forward rotating mechanism is fixedly arranged on the mounting circular groove, a reverse rotating mechanism is arranged on the forward rotating mechanism, and the reverse rotating mechanism is fixedly connected to the output end of the intermittent rotating mechanism. The present invention arranges a rotating column, and arranges a knife handle injection half groove, a knife shell injection half groove, an adjustment block injection half groove and a tail block injection half groove on four injection molding surfaces of the rotating column respectively, so that two knife handle injection half grooves, two knife shell injection half grooves, two adjustment block injection half grooves and two tail block injection half grooves respectively located on the upper module and the lower module constitute a knife handle injection molding cavity, a knife shell injection molding cavity, an adjustment block injection molding cavity and a tail block injection molding cavity respectively, and through adjustment by an intermittent rotating mechanism, the device can perform injection molding on all parts of the utility knife shell, thereby reducing the device cost, reducing the time for replacing the injection mold of the utility knife shell, and improving the functionality of the injection mold of the utility knife shell, thereby solving the technical problem of the single function of the injection mold of the utility knife shell.

[0007] Preferably, the upper module and the lower module are both provided with a mounting groove at one end away from the feed inlet, and the upper module and the lower module are both provided with a cavity at a position relative to the gap between the mounting groove and the mounting circular groove.

[0008] Preferably, a column groove is opened in the rotating column located on the lower module, and a plurality of groups of movable hole grooves are opened on the column groove in a linear and equidistant structure, each group of the movable hole grooves includes four arranged in a ring-shaped structure, and the four movable hole grooves are respectively connected with the knife handle injection half groove, the knife shell injection half groove, the adjustment block injection half groove and the tail block injection half groove located on the lower module.

[0009] Preferably, the adjustment block injection half-groove includes a plurality of injection half-grooves A arranged in a linear and equidistant structure, and any two adjacent injection half-grooves A are connected through a connecting groove A; the tail block injection half-groove includes a plurality of injection half-grooves B arranged in a linear and equidistant structure, and any two adjacent injection half-grooves B are connected through a connecting groove B.

[0010] Preferably, the intermittent rotating mechanism comprises a servo motor, a coupling shaft A and a coupling shaft B, the servo motor is fixedly mounted on the mounting groove, the coupling shaft A and the coupling shaft B are both rotatably mounted in the cavity, the coupling shaft A passes through the cavity and extends into the mounting groove and is fixedly connected to the output shaft of the servo motor, a disc A is fixedly mounted on the coupling shaft A, a movable column is fixedly mounted on the disc A, a disc B is fixedly mounted on the coupling shaft B, the disc B is staggered with the disc A, four centripetal grooves are formed in an annular structure with equal spacing on the disc B, and the movable column cooperates with the centripetal groove movable disc;

[0011] The connecting shaft B located on the upper module penetrates into the rotating groove and is fixedly connected to the corresponding rotating column, and the connecting shaft B located on the lower module near one end of the lifting mechanism penetrates into the wall of the lower module and is fixedly connected to the input end of the lifting mechanism.

[0012] Preferably, the disk B is provided with a limiting arc groove relative to any two of the centripetal grooves, and the disk A is fixedly provided with a circular notch block at one end close to the limiting arc groove, and the circular notch block is movably matched with the limiting arc groove.

[0013] Preferably, the lifting mechanism includes a main shaft, which is rotatably arranged in the column groove, and the main shaft is provided with four grooves in an annular equidistant structure, the grooves are in a trapezoidal structure, and the centripetal end faces of the grooves are in a circular arc structure, and chamfers are provided at both ends of the eccentric side of the grooves, and the main shaft surface is provided with a plurality of adapting guide grooves relative to the positions of the plurality of groups of movable hole grooves, and the adapting guide grooves are movably connected with four ball blocks, and the ball blocks are fixed with a push rod, and the plurality of push rods are movably connected with the plurality of movable hole grooves respectively.

[0014] Preferably, connecting rods are provided at both ends of the main shaft, and the connecting rods are rotatably connected to the column grooves. The connecting shaft B penetrates into the wall of the lower module near one end of the main shaft and is fixedly connected to the corresponding connecting rod.

[0015] Preferably, the forward rotation mechanism includes an outer ring, which is fixed in the mounting circular groove, and a limiting protrusion A is integrally connected to the inner edge surface of the outer ring, and a positive swivel ring is rotatably connected to the limiting protrusion A, and the positive swivel ring is fixedly connected to the rotating column located on the lower module, and a plurality of positive arc grooves are provided in a circular equidistant structure on the outer edge surface of the positive swivel ring, and the depth of the positive arc grooves gradually decreases in the clockwise direction, and the positive arc grooves are adapted in shape to the limiting protrusion A, and the gap between the positive arc grooves and the limiting protrusion A constitutes a reverse limiting cavity, and a limiting column A is movably connected in the reverse limiting cavity, and the limiting column A is adapted in shape to the reverse limiting cavity, and the limiting column A is elastically connected to the wide part of the positive arc groove through a spring A, and a limiting protrusion B is integrally connected to the inner edge surface of the positive swivel ring.

[0016] Preferably, the reverse rotation mechanism includes a reverse rotating ring, which is rotatably arranged on the limiting protrusion B, and is fixedly connected to the connecting shaft B located on the lower module. A plurality of reverse arc grooves are provided on the outer edge surface of the reverse rotating ring in a circular equidistant structure, and the depth of the reverse arc grooves gradually decreases in the counterclockwise direction. The reverse arc grooves are adapted to the shape of the limiting protrusion B, and the gap between the reverse arc grooves and the limiting protrusion B constitutes a forward limiting cavity. A limiting column B is movably connected in the forward limiting cavity, and the limiting column B is adapted to the shape of the forward limiting cavity, and the limiting column B is elastically connected to the wide part of the reverse arc groove through a spring B.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention sets a rotating column, and sets a knife handle injection half groove, a knife shell injection half groove, an adjustment block injection half groove and a tail block injection half groove on the four injection molding surfaces of the rotating column respectively, so that the two knife handle injection half grooves, two knife shell injection half grooves, two adjustment block injection half grooves and two tail block injection half grooves respectively located on the upper module and the lower module constitute the knife handle injection molding cavity, the knife shell injection molding cavity, the adjustment block injection molding cavity and the tail block injection molding cavity respectively, and through the adjustment of the intermittent rotating mechanism, the device can perform injection molding on all parts of the utility knife shell, reduce the device cost, and reduce the time for replacing the injection mold of the utility knife shell, improve the functionality of the injection mold of the utility knife shell, thereby solving the technical problem of the single function of the injection mold of the utility knife shell.

[0019] 2. The present invention adopts the structural design of the intermittent rotating mechanism, so that the output shaft of the servo motor is controlled by the external control mechanism to rotate one circle, the connecting shaft A rotates, and the disc A and the movable column rotate with the connecting shaft A as the axis. When the connecting shaft A is connected, the movable column moves in one of the centripetal grooves and enters the eccentric end of the other centripetal groove after being disengaged. When the movable column moves in the centripetal groove, the disc B drives the connecting shaft B to rotate. The number of the centripetal grooves is set to four in a circular structure with equal spacing, so that the disc B rotates exactly 90 degrees, and the connecting shaft B located on the upper module drives the corresponding rotating column Rotating 90 degrees just completes the change of the injection cavity. The connecting shaft B on the lower module drives the lifting mechanism to rotate 90 degrees, and the disc A rotates, and the circular block rotates relative to the limiting arc groove. The notch of the circular block does not affect the rotation of the disc B. After the movable column enters one of the centripetal grooves and moves out, the outer edge of the circular block is limited to the limiting arc groove, so that the disc B will not rotate under the inertia factor, ensuring the stability of the intermittent rotation mechanism of 90 degrees, and facilitating the adjustment between the injection molding cavity of the tool handle, the injection molding cavity of the tool shell, the injection molding cavity of the adjustment block and the injection molding cavity of the tail block.

[0020] 3. The present invention adopts the structural design of the lifting mechanism, so that when the connecting shaft B rotates, it drives the connecting rod and the main shaft to rotate, so that the ball block moves relative to the adaptive guide groove. When the ball block moves relative to the adaptive guide groove located at the centripetal end surface of the groove, the position of the push rod remains stationary. When the ball block moves relative to the adaptive guide groove located at the gap between the two grooves, the ball block drives the push rod to move along the corresponding active hole groove in the eccentric direction first. After a short stay, the ball block drives the push rod to interactively move along the centripetal direction of the corresponding active hole groove to complete the lifting and return to the original position, which is used for demolding of utility knife shell parts after injection molding.

[0021] 4. The present invention, through the structural design of the forward rotation mechanism and the reverse rotation mechanism, makes the connecting shaft B located on the lower module rotate forward, the reverse swivel rotate forward and drive the forward swivel to rotate forward through the limiting column B, so that the swivel column and the lifting mechanism rotate forward as a whole, which is used for adjustment between the injection cavity, the tool handle injection cavity, the knife shell injection cavity, the adjustment block injection cavity and the tail block injection cavity. The connecting shaft B located on the lower module rotates reversely, the reverse swivel rotates reversely relative to the forward swivel, and the forward swivel remains stationary, causing the connecting rod and the main shaft to rotate. It can be seen from the lifting mechanism that the ejector rod moves back and forth in the centripetal direction, which is used for demolding of the utility knife shell parts after injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility knife of the present invention.

[0023] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 3 It is a schematic diagram of the overall structure explosion of the present invention.

[0025] Figure 4 It is a schematic diagram of the explosion structure of the upper module and the lower module of the present invention.

[0026] Figure 5 for Figure 3 Schematic diagram of part of the structure.

[0027] Figure 6 for Figure 5 A magnified schematic diagram of the local structure.

[0028] Figure 7 for Figure 5 Schematic diagram of partial structure explosion.

[0029] Figure 8 It is an exploded schematic diagram of the rotating column structure located on the lower module of the present invention.

[0030] Fig. 9 for Figure 7 Schematic diagram of the partial structure of the intermittent rotating mechanism.

[0031] Fig.10 It is a partial structural schematic diagram of the intermittent rotating mechanism of the present invention.

[0032] Fig.11 for Figure 7 A partial structural diagram of the lifting mechanism.

[0033] Fig.12 It is a schematic cross-sectional structure diagram of the jacking mechanism of the present invention.

[0034] Fig.13 It is a schematic diagram of the exploded structure of the forward rotating mechanism and the reverse rotating mechanism of the present invention.

[0035] Fig.14 It is a schematic cross-sectional structure diagram of the forward rotating mechanism and the reverse rotating mechanism of the present invention.

[0036] Fig.15 for Fig.14 A magnified schematic diagram of the local structure.

[0037] Description of the numbers in the figure:

[0038] 01. Knife handle; 02. Knife shell; 03. Adjustment block; 04. Tail block; 05. Knife groove;

[0039] 1. Upper module; 2. Lower module; 3. Rotating slot; 4. Rotating column; 5. Rotating shaft; 6. Intermittent rotating mechanism; 7. Lifting mechanism; 8. Forward rotating mechanism; 9. Reverse rotating mechanism;

[0040] 21. Feeding port; 22. Installation circular groove; 23. Installation groove; 24. Cavity;

[0041] 41. Injection molding surface; 42. Injection molding half groove of knife handle; 43. Injection molding half groove of knife shell; 44. Injection molding half groove of adjustment block; 45. Injection molding half groove of tail block; 46. Column groove; 47. Activity hole groove;

[0042] 441, injection molding half groove A; 442, through groove A;

[0043] 451, injection molding half groove B; 452, connecting groove B;

[0044] 61. servo motor; 62. coupling A; 63. coupling B; 64. disc A; 65. disc B; 66. movable column; 67. limit arc groove; 68. circular block; 69. centripetal groove;

[0045] 71. spindle; 72. groove; 73. adaptor guide groove; 74. ball block; 75. ejector rod; 76. connecting rod;

[0046] 81. outer ring; 82. limiting protrusion A; 83. positive rotating ring; 84. positive arc groove; 85. limiting cylinder A; 86. spring A; 87. limiting protrusion B;

[0047] 91. Reverse swivel; 92. Reverse arc groove; 93. Limiting cylinder B; 94. Spring B. DETAILED DESCRIPTION

[0048] like Figures 1 to 15 As shown, the present invention relates to an injection mold for a utility knife shell, comprising an upper module 1 and a lower module 2, wherein the upper module 1 and the lower module 2 have opposite ends provided with a rotating groove 3, the rotating groove 3 is rotatably connected to a rotating column 4, a rotating shaft 5 is fixedly provided on the rotating column 4, the rotating shaft 5 is rotatably connected to the rotating groove 3, the rotating column 4 is provided with four injection molding surfaces 41 in a ring-shaped equally spaced indirect structure, the four injection molding surfaces 41 are respectively provided with a handle injection molding half groove 42, a knife shell injection molding half groove 43, an adjustment block injection molding half groove 44 and a tail block injection molding half groove 45, a feeding port 21 is provided at the top of one side of the lower module 2, the handle injection molding half groove 42, the knife shell injection molding half groove 43, the adjustment block injection molding half groove 44 and the tail block injection molding half groove 45 on the lower module 2 The tail block injection molding half groove 45 is connected and cooperated with the feed port 21, and an intermittent rotating mechanism 6 is provided at one end of the upper module 1 and the lower module 2 away from the feed port 21; the intermittent rotating mechanism 6 located on the upper module 1 is fixedly connected to the rotating column 4 located on the upper module 1, and a lifting mechanism 7 is arranged in the rotating column 4 located on the lower module 2, and the input end of the lifting mechanism 7 is fixedly connected to the output end of the intermittent rotating mechanism 6 on the lower module 2, and the lower module 2 is provided with an installation circular groove 22 relative to the output end of the lifting mechanism 7, and a forward rotating mechanism 8 is fixedly provided on the installation circular groove 22, and a reverse rotating mechanism 9 is provided on the forward rotating mechanism 8, and the reverse rotating mechanism 9 is fixedly connected to the output end of the intermittent rotating mechanism 6.

[0049] In the embodiment of the present invention, the upper module 1 and the lower module 2 are both provided with a mounting groove 23 at one end away from the feed port 21 , and the upper module 1 and the lower module 2 are both provided with a cavity 24 at a gap position relative to the mounting groove 23 and the mounting circular groove 22 .

[0050] In an embodiment of the present invention, a column groove 46 is opened in the rotating column 4 located on the lower module 2, and a plurality of groups of movable hole grooves 47 are opened on the column groove 46 in a linear and evenly spaced structure. Each group of movable hole grooves 47 includes four arranged in a ring-shaped structure. The four movable hole grooves 47 are respectively connected with the handle injection half groove 42, the knife shell injection half groove 43, the adjustment block injection half groove 44 and the tail block injection half groove 45 located on the lower module 2.

[0051] In an embodiment of the present invention, the adjustment block injection molding half groove 44 includes a plurality of injection molding half grooves A441 arranged in a linear and equidistant structure, and any two adjacent injection molding half grooves A441 are connected through a connecting groove A442, and the tail block injection molding half groove 45 includes a plurality of injection molding half grooves B451 arranged in a linear and equidistant structure, and any two adjacent injection molding half grooves B451 are connected through a connecting groove B452. The adjustment block 03 and the tail block 04 of the tool are relatively small in volume relative to the handle 01 and the tool housing 02, so multiple pieces are provided. After the injection molding is completed, they are subsequently separated. This step is a prior art and will not be described in detail here.

[0052] In an embodiment of the present invention, the intermittent rotating mechanism 6 includes a servo motor 61, a connecting shaft A62 and a connecting shaft B63. The servo motor 61 is fixed on the mounting groove 23. The connecting shaft A62 and the connecting shaft B63 are both rotatably arranged in the cavity 24. The connecting shaft A62 passes through the cavity 24 and extends into the mounting groove 23 and is fixedly connected to the output shaft of the servo motor 61. A disc A64 is fixedly provided on the connecting shaft A62, and a movable column 66 is fixedly provided on the disc A64. A disc B65 is fixedly provided on the connecting shaft B63. The disc B65 and the disc A64 are arranged alternately. Four centripetal grooves 69 are provided in an annular equidistant structure on the disc B65, and the movable column 66 cooperates with the movable disc of the centripetal groove 69; the connecting shaft B63 located on the upper module 1 penetrates into the rotating groove 3 and is fixedly connected to the corresponding rotating column 4, and the connecting shaft B63 located on the lower module 2 penetrates into the wall of the lower module 2 close to the lifting mechanism 7 at one end and is fixedly connected to the input end of the lifting mechanism 7. The present invention, through the structural design of the intermittent rotating mechanism 6, makes it possible to control the output shaft of the servo motor 61 to rotate one circle through the external control mechanism, and the connecting shaft A62 rotates, so that the disk A64 and the movable column 66 rotate with the connecting shaft A62 as the axis. When the connecting shaft A62 is connected, the movable column 66 moves into one of the centripetal grooves 69 and then enters the eccentric end of the other centripetal groove 69 after being disengaged. When the movable column 66 moves in the centripetal groove 69, the disk B65 drives the connecting shaft B63 to rotate. The number of the centripetal grooves 69 is set to four in a circular equidistant structure, so that the disk B65 rotates exactly 90 degrees, and the connecting shaft B63 located on the upper module 1 drives the corresponding rotating column 4 to rotate 90 degrees, just completing the change of the injection cavity, and the connecting shaft B63 located on the lower module 2 drives the lifting mechanism 7 to rotate 90 degrees.

[0053] In the embodiment of the present invention, the disc B65 is provided with a limit arc groove 67 at the position relative to any two centripetal grooves 69, and the disc A64 is fixed with a circular notch block 68 at one end close to the limit arc groove 67, and the circular notch block 68 is movably matched with the limit arc groove 67. Through the above arrangement, the present invention allows the disc A64 to rotate, and the circular notch block 68 to rotate relative to the limit arc groove 67. The notch of the circular notch block 68 does not affect the rotation of the disc B65, and after the movable column 66 enters one of the centripetal grooves 69 and moves and disengages, the outer edge of the circular notch block 68 faces the limit arc groove 67 to limit the disc B65, so that the disc B65 will not rotate under the inertia factor, ensuring the stability of the 90-degree rotation of the intermittent rotating mechanism 6, and facilitating the adjustment between the injection molding cavity of the knife handle, the injection molding cavity of the knife shell, the injection molding cavity of the adjustment block, and the injection molding cavity of the tail block.

[0054] In an embodiment of the present invention, the lifting mechanism 7 includes a main shaft 71, which is rotatably arranged in the column groove 46. Four grooves 72 are provided on the main shaft 71 in an annular equidistant structure. The grooves 72 are trapezoidal in structure, and the centripetal end faces of the grooves 72 are in an arc structure. Both ends of the eccentric side of the grooves 72 are chamfered. A plurality of adapting guide grooves 73 are provided on the surface of the main shaft 71 relative to the positions of the plurality of movable hole grooves 47. Four ball blocks 74 are movably connected to the adapting guide grooves 73. The ball blocks 74 are fixed with push rods 75, and the plurality of push rods 75 are movably connected to the plurality of movable hole grooves 47 respectively. Connecting rods 76 are provided at both ends of the main shaft 71. The connecting rods 76 are rotatably connected to the column grooves 46. The connecting shaft B63 penetrates into the wall of the lower module 2 close to one end of the main shaft 71 and is fixedly connected to the corresponding connecting rods 76. The present invention adopts the structural design of the lifting mechanism 7, so that when the connecting shaft B63 rotates 90 degrees, it drives the connecting rod 76 and the main shaft 71 to rotate, so that the ball block 74 moves relative to the adapting guide groove 73. When the ball block 74 moves relative to the adapting guide groove 73 located at the centripetal end surface of the groove 72, the position of the push rod 75 remains unchanged. When the ball block 74 moves relative to the adapting guide groove 73 located at the gap between the two grooves 72, the ball block 74 drives the push rod 75 to move along the corresponding active hole groove 47 in the eccentric direction first. After a short stay, the ball block 74 drives the push rod 75 to interactively complete the lifting and return to the original position along the centripetal direction of the corresponding active hole groove 47, which is used for demolding of the utility knife shell parts after injection molding.

[0055] In an embodiment of the present invention, the forward rotation mechanism 8 includes an outer ring 81, which is fixed in the mounting circular groove 22. A limiting protrusion A82 is integrally connected to the inner edge surface of the outer ring 81. A forward swivel ring 83 is rotatably connected to the limiting protrusion A82. The forward swivel ring 83 is fixedly connected to the rotating column 4 located on the lower module 2. A plurality of positive arc grooves 84 are provided in a circular equidistant structure on the outer edge surface of the forward swivel ring 83. The depth of the positive arc grooves 84 gradually decreases in the clockwise direction. The positive arc grooves 84 are adapted in shape to the limiting protrusion A82, and the gap between the positive arc grooves 84 and the limiting protrusion A82 constitutes a reverse limiting cavity. A limiting column A85 is movably connected in the reverse limiting cavity. The limiting column A85 is adapted in shape to the reverse limiting cavity, and the limiting column A85 is elastically connected to the wide part of the positive arc groove 84 through a spring A86. A limiting protrusion B87 is integrally connected to the inner edge surface of the forward swivel ring 83. Through the structural design of the forward rotation mechanism 8, the present invention ensures that the limit column A85 is always located in the middle position of the reverse limit cavity under the elastic force of the spring A86, so that when the forward swivel ring 83 rotates forward, the limit column A85 has a force to move toward the wide part of the forward arc groove 84, which has little effect on the rotation of the forward swivel ring 83. When the forward swivel ring 83 rotates reversely, the limit column A85 has a force to move toward the narrow part of the forward arc groove 84, causing the limit protrusion A82 to lock the forward swivel ring 83 through the limit column A85, so that the forward swivel ring 83 cannot rotate forward and can only rotate forward.

[0056] In an embodiment of the present invention, the reverse rotation mechanism 9 includes a reverse rotating ring 91, which is rotatably arranged on the limiting protrusion B87. The reverse rotating ring 91 is fixedly connected to the connecting shaft B63 located on the lower module 2. A plurality of reverse arc grooves 92 are provided in a circular equidistant structure on the outer edge surface of the reverse rotating ring 91. The depth of the reverse arc grooves 92 gradually decreases in the counterclockwise direction. The reverse arc grooves 92 are adapted to the shape of the limiting protrusion B87, and the gap between the reverse arc grooves 92 and the limiting protrusion B87 constitutes a forward limiting cavity. A limiting column B93 is movably connected in the forward limiting cavity. The limiting column B93 is adapted to the shape of the forward limiting cavity, and the limiting column B93 is elastically connected to the wide part of the reverse arc groove 92 through a spring B94. The present invention has a structural design for the reverse rotation mechanism 9. Through the principle of the forward rotation mechanism 8, it can be known that the connecting shaft B63 located on the lower module 2 rotates forward, the reverse swivel 91 rotates forward and drives the forward swivel 83 to rotate forward through the limiting column B93, causing the rotating column 4 and the lifting mechanism 7 to rotate forward as a whole, which is used for adjustment between the injection cavity, the tool handle injection cavity, the knife shell injection cavity, the adjustment block injection cavity and the tail block injection cavity. The connecting shaft B63 located on the lower module 2 rotates reversely, the reverse swivel 91 rotates reversely relative to the forward swivel 83, and the forward swivel 83 remains stationary, causing the connecting rod 76 and the main shaft 71 to rotate. It can be known from the lifting mechanism 7 that the ejector rod 75 moves back and forth in the centripetal direction, which is used for demolding of the utility knife shell parts after injection molding.

[0057] Working principle: This embodiment provides an injection mold for a utility knife shell. The injection molding process is a prior art and will not be described in detail here. When adjustment is required between the knife handle injection molding cavity, the knife shell injection molding cavity, the adjustment block injection molding cavity and the tail block injection molding cavity; the servo motor 61 output shaft is controlled by an external control mechanism to rotate one circle in the positive direction, and the connecting shaft A62 rotates, so that the disk A64 and the movable column 66 rotate with the connecting shaft A62 as the axis. The connecting shaft A62 rotates, and the movable column 66 moves in one of the centripetal grooves 69 and disengages and then enters the eccentric end of the other centripetal groove 69. When the movable column 66 moves in the centripetal groove 69, the disk B65 drives the connecting shaft B63 to rotate, and the setting The number of the centripetal grooves 69 is four and they are arranged in a circular structure with equal spacing, so that the disc B65 rotates exactly 90 degrees, and the connecting shaft B63 on the upper module 1 drives the corresponding rotating column 4 to rotate 90 degrees, just completing the change of the injection cavity. The number of rotations of the output shaft of the servo motor 61 can be determined according to the required injection cavity. The connecting shaft B63 on the lower module 2 rotates one circle, and the reverse rotating ring 91 rotates forward and drives the forward rotating ring 83 to rotate forward through the limiting cylinder B93, so that the rotating column 4 and the lifting mechanism 7 rotate forward as a whole. The number of rotations of the output shaft of the servo motor 61 is determined according to the required injection cavity, and the injection cavity on the rotating column 4 on the lower module 2 is adjusted;

[0058] After injection molding, the output shaft of the servo motor 61 is controlled by an external control mechanism to rotate in the opposite direction for one circle, and the reverse swivel ring 91 rotates in the opposite direction relative to the forward swivel ring 83, while the forward swivel ring 83 remains stationary, causing the connecting rod 76 and the main shaft 71 to rotate, thereby driving the connecting rod 76 and the main shaft 71 to rotate, so that the ball block 74 moves relative to the adapting guide groove 73. When the ball block 74 moves relative to the adapting guide groove 73 located at the centripetal end surface of the groove 72, the position of the ejector rod 75 remains stationary. When the ball block 74 moves relative to the adapting guide groove 73 located at the gap position between the two grooves 72, the ball block 74 drives the ejector rod 75 to move along the corresponding active hole groove 47 in the eccentric direction first. After a short stay, the ball block 74 drives the ejector rod 75 to interactively complete the ejection and return to the original position along the centripetal direction of the corresponding active hole groove 47. When the ejector rod 75 is ejected, the plastic knife shell parts after injection molding in the injection molding cavity are demolded.

[0059] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. An injection mold for a utility knife housing, characterized in that: The invention comprises an upper module (1) and a lower module (2), wherein the upper module (1) and the lower module (2) are provided with a rotation groove (3) at opposite ends, the rotation groove (3) is rotatably connected to a rotation column (4), a rotation shaft (5) is fixedly provided on the rotation column (4), the rotation shaft (5) is rotatably connected to the rotation groove (3), and the rotation column (4) is provided with four injection molding surfaces (41) in an indirect structure with equal spacing in a ring, and the four injection molding surfaces (41) are respectively provided with a knife handle injection molding half groove (42), a knife shell injection molding half groove (43) and a knife shell injection molding half groove (44). ), an adjustment block injection molding half groove (44) and a tail block injection molding half groove (45), a feed inlet (21) is provided at the top of one side of the lower module (2), the handle injection molding half groove (42), the knife shell injection molding half groove (43), the adjustment block injection molding half groove (44) and the tail block injection molding half groove (45) on the lower module (2) are all connected and cooperate with the feed inlet (21), and an intermittent rotating mechanism (6) is provided at one end of the upper module (1) and the lower module (2) away from the feed inlet (21); The intermittent rotating mechanism (6) on the upper module (1) is fixedly connected to the rotating column (4) on the upper module (1); a lifting mechanism (7) is arranged inside the rotating column (4) on the lower module (2); an input end of the lifting mechanism (7) is fixedly connected to an output end of the intermittent rotating mechanism (6) on the lower module (2); a mounting circular groove (22) is provided on the lower module (2) at a position relative to the output end of the lifting mechanism (7); a forward rotating mechanism (8) is fixedly provided on the mounting circular groove (22); a reverse rotating mechanism (9) is provided on the forward rotating mechanism (8); and the reverse rotating mechanism (9) is fixedly connected to the output end of the intermittent rotating mechanism (6); A column groove (46) is provided in the rotating column (4) located on the lower module (2), and a plurality of groups of movable hole grooves (47) are provided on the column groove (46) in a linear and equidistant structure, each group of the movable hole grooves (47) includes four holes arranged in a ring-shaped structure, and the four movable hole grooves (47) are respectively connected to the knife handle injection molding half groove (42), the knife shell injection molding half groove (43), the adjustment block injection molding half groove (44) and the tail block injection molding half groove (45) located on the lower module (2); The upper module (1) and the lower module (2) are each provided with a mounting groove (23) at one end away from the feed inlet (21), and the upper module (1) and the lower module (2) are each provided with a cavity (24) at a position of the gap between the mounting groove (23) and the mounting circular groove (22); The intermittent rotating mechanism (6) comprises a servo motor (61), a connecting shaft A (62) and a connecting shaft B (63); the servo motor (61) is fixedly mounted on the mounting groove (23); the connecting shaft A (62) and the connecting shaft B (63) are both rotatably mounted in the cavity (24); the connecting shaft A (62) passes through the cavity (24) and extends into the mounting groove (23) and is fixedly connected to the output shaft of the servo motor (61); a disk A (64) is fixedly mounted on the connecting shaft A (62); a movable column (66) is fixedly mounted on the disk A (64); a disk B (65) is fixedly mounted on the connecting shaft B (63); the disk B (65) and the disk A (64) are arranged in an alternating manner; four centripetal grooves (69) are formed on the disk B (65) in an annular structure with equal spacing; the movable column (66) cooperates with the movable disk of the centripetal groove (69); The connecting shaft B (63) located on the upper module (1) penetrates into the rotating groove (3) and is fixedly connected to the corresponding rotating column (4); the connecting shaft B (63) located on the lower module (2) penetrates into the wall of the lower module (2) at one end close to the lifting mechanism (7) and is fixedly connected to the input end of the lifting mechanism (7); The lifting mechanism (7) comprises a main shaft (71), the main shaft (71) is rotatably arranged in the column groove (46), the main shaft (71) is provided with four grooves (72) in an annular structure with equal spacing, the grooves (72) are in a trapezoidal structure, and the centripetal end faces of the grooves (72) are in an arc structure, and both ends of the eccentric side of the grooves (72) are provided with chamfers, the surface of the main shaft (71) is provided with a plurality of adapting guide grooves (73) at positions relative to the plurality of groups of the movable hole grooves (47), the adapting guide grooves (73) are movably connected with four ball blocks (74), the ball blocks (74) are fixedly provided with a push rod (75), and the plurality of push rods (75) are movably connected with the plurality of movable hole grooves (47) respectively; Connecting rods (76) are provided at both ends of the main shaft (71), and the connecting rods (76) are rotatably connected to the column slots (46). The connecting shaft B (63) is inserted into the wall of the lower module (2) at one end close to the main shaft (71) and is fixedly connected to the corresponding connecting rod (76).

2. The injection mold for the utility knife housing according to claim 1, characterized in that: The regulating block injection half groove (44) comprises a plurality of injection half grooves A (441) arranged in a linear and equidistant structure, and any two adjacent injection half grooves A (441) are connected via a connecting groove A (442). The tail block injection half groove (45) comprises a plurality of injection half grooves B (451) arranged in a linear and equidistant structure, and any two adjacent injection half grooves B (451) are connected via a connecting groove B (452).

3. The injection mold for the utility knife housing according to claim 2, characterized in that: The disk B (65) is provided with a limit arc groove (67) at a position relative to any two of the centripetal grooves (69), and a circular notch block (68) is fixedly provided at one end of the disk A (64) close to the limit arc groove (67), and the circular notch block (68) is movably matched with the limit arc groove (67).

4. The injection mold for the utility knife housing according to claim 3, characterized in that: The forward rotation mechanism (8) comprises an outer ring (81), the outer ring (81) being fixedly arranged in the mounting circular groove (22), the inner edge surface of the outer ring (81) being integrally connected with a limiting protrusion A (82), the limiting protrusion A (82) being rotatably connected with a forward rotating ring (83), the forward rotating ring (83) being fixedly connected to the rotating column (4) located on the lower module (2), the outer edge surface of the forward rotating ring (83) being provided with a plurality of forward arc grooves (84) in an annular equidistant structure, the depth of the forward arc grooves (84) increasing along the clockwise direction. The needle direction gradually becomes smaller, the positive arc groove (84) is adapted to the shape of the limiting protrusion A (82), and the gap between the positive arc groove (84) and the limiting protrusion A (82) constitutes a reverse limiting cavity, the limiting cylinder A (85) is movably connected in the reverse limiting cavity, the limiting cylinder A (85) is adapted to the shape of the reverse limiting cavity, and the limiting cylinder A (85) is elastically connected to the wide part of the positive arc groove (84) through a spring A (86), and the limiting protrusion B (87) is integrally connected to the inner edge surface of the positive rotating ring (83).

5. The injection mold for the utility knife housing according to claim 4, characterized in that: The reverse rotation mechanism (9) comprises a reverse rotating ring (91), the reverse rotating ring (91) is rotatably arranged on the limiting protrusion B (87), the reverse rotating ring (91) is fixedly connected to the connecting shaft B (63) located on the lower module (2), a plurality of reverse arc grooves (92) are formed in an annular equidistant structure on the outer edge surface of the reverse rotating ring (91), the depth of the reverse arc grooves (92) gradually decreases along the counterclockwise direction, the reverse arc grooves (92) are adapted to the shape of the limiting protrusion B (87), and the gap between the reverse arc grooves (92) and the limiting protrusion B (87) forms a forward limiting cavity, a limiting column B (93) is movably connected in the forward limiting cavity, the limiting column B (93) is adapted to the shape of the forward limiting cavity, and the limiting column B (93) is elastically connected to the wide portion of the reverse arc groove (92) via a spring B (94).

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