Injection mold for shell of art knife

Abstract

The invention discloses an injection mold of an art knife shell, relates to the technical field of art knife shell injection molding, and aims to solve the technical problem of single function of the injection mold of the art knife shell, and the injection mold comprises an upper module, a lower module, a rotating groove, a rotating column, a rotating shaft, an intermittent rotating mechanism, a jacking mechanism, a forward rotating mechanism and a reverse rotating mechanism. The rotary column is arranged, and the knife handle injection molding half groove, the knife shell injection molding half groove, the adjusting block injection molding half groove and the tail block injection molding half groove are formed in the four injection molding faces of the rotary column correspondingly; the two knife handle injection molding half grooves, the two knife shell injection molding half grooves, the two adjusting block injection molding half grooves and the two tail block injection molding half grooves which are located in the upper module and the lower module correspondingly form a knife handle injection molding cavity, a knife shell injection molding cavity, an adjusting block injection molding cavity and a tail block injection molding cavity correspondingly and are adjusted through an intermittent rotating mechanism; and all parts of the art knife shell can be subjected to injection molding, and the functionality of the injection mold for the art knife shell is improved.

Description

Technical Field

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

[0002] A utility knife, also known as a carving knife or wallpaper knife, is a type of knife used in art and crafts, primarily for cutting soft materials. Most are made of a pull-out shell and blade. A few have metal handles. The blade is often beveled, allowing it to be broken along the scoreline of the blade, creating a new edge for easier 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 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 in breaking the blade. It can be seen that when producing a utility knife, it is necessary to separately injection mold the 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 and have 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 production efficiency. In view of this, we propose an injection mold for the utility knife shell. 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 opposite ends of the upper module and the lower module are provided with a rotating groove, the rotating groove is rotatably connected to a rotating column, a rotating shaft is fixed on the rotating column, and the rotating shaft is rotatably connected to the rotating groove, the rotating column is provided with four injection molding surfaces in an indirect structure with equal spacing in a ring, and the four injection molding surfaces are respectively provided with 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, a feeding port is provided at the top of one side of the lower module, 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 are all communicated with the feeding port, and an intermittent rotating mechanism is provided on the end of the upper module and the lower module away from the feeding port; Among them, the intermittent rotation mechanism located on the upper module is fixedly connected to the rotating column located on the upper module, and 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 rotation mechanism output end on 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, and a forward rotation mechanism is fixed on the mounting circular groove. A reverse rotation mechanism is provided on the forward rotation mechanism, and the reverse rotation mechanism is fixedly connected to the output end of the intermittent rotation mechanism. The present invention sets a rotating column, and respectively 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, 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 cavity, the knife shell injection cavity, the adjustment block injection cavity and the tail block injection 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 cost of the device, and reduce the time of replacing the injection mold of the utility knife shell, thereby 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.

[0006] Preferably, the upper module and the lower module are both provided with a mounting groove at one end away from the feed port, 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.

[0007] Preferably, a column groove is provided in the rotating column located on the lower module, and a plurality of groups of movable hole grooves are provided 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-molded half groove, the knife shell injection-molded half groove, the adjustment block injection-molded half groove and the tail block injection-molded half groove located on the lower module.

[0008] Preferably, the injection half-grooves of the adjustment block include several injection half-grooves A arranged in a linear and equidistant structure, and any two adjacent injection half-grooves A are connected by a connecting groove A; the injection half-grooves of the tail block include several injection half-grooves B arranged in a linear and equidistant structure, and any two adjacent injection half-grooves B are connected by a connecting groove B.

[0009] Preferably, the intermittent rotation mechanism includes a servo motor, a coupling A and a coupling B, the servo motor is fixedly mounted on the mounting slot, the coupling A and the coupling B are both rotatably mounted in the cavity, the coupling A passes through the cavity and extends into the mounting slot and is fixedly connected to the servo motor output shaft, a disc A is fixedly mounted on the coupling A, a movable column is fixedly mounted on the disc A, a disc B is fixedly mounted on the coupling B, the disc B and the disc A are arranged alternately, and four centripetal grooves are formed in an annular equidistant structure on the disc B, and the movable column cooperates with the movable disc in the centripetal grooves; The connecting shaft B located on the upper module penetrates the rotating groove and is fixedly connected to the corresponding rotating column. The connecting shaft B located on the lower module penetrates the wall of the lower module close to one end of the lifting mechanism and is fixedly connected to the input end of the lifting mechanism.

[0010] Preferably, a limiting arc groove is provided on the disk B relative to any two of the centripetal grooves, and a circular segment block is fixedly provided on one end of the disk A near the limiting arc groove, and the circular segment block is movably matched with the limiting arc groove.

[0011] 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 trapezoidal in structure, and the centripetal end faces of the grooves are in an 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 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.

[0012] Preferably, connecting rods are provided at both ends of the main shaft, and the connecting rods are rotatably connected to the column slots. The connecting shaft B passes through the lower module wall near one end of the main shaft and is fixedly connected to the corresponding connecting rod.

[0013] 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 forward rotating ring is rotatably connected to the limiting protrusion A, and the forward rotating ring is fixedly connected to the rotating column located on the lower module, and a plurality of positive arc grooves are provided on the outer edge surface of the forward rotating ring in a circular equidistant structure, and the depth of the positive arc grooves gradually decreases in the clockwise direction, and the positive arc grooves are adapted to the shape of 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 to the shape of the reverse limiting cavity, and the limiting column A is elastically connected to the wide part of the positive arc groove by a spring A, and a limiting protrusion B is integrally connected to the inner edge surface of the forward rotating ring.

[0014] Preferably, the reverse rotation mechanism includes a reverse rotating ring, which is rotatably arranged on the limiting protrusion B. The reverse rotating ring is fixedly connected to the connecting shaft B located on the lower module. A plurality of reverse arc grooves are provided in a ring-shaped equidistant structure on the outer edge surface of the reverse rotating ring. The depth of the reverse arc groove gradually decreases in the counterclockwise direction. The reverse arc groove is adapted to the shape of the limiting protrusion B, and the gap between the reverse arc groove and the limiting protrusion B constitutes a forward limiting cavity. A limiting column B is movably connected in the forward limiting cavity. 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.

[0015] The beneficial effects of the present invention are: 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 located on the upper module and the lower module respectively 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, 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 cost of the device, and reduce the time of replacing the injection mold of the utility knife shell, thereby 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.

[0016] 2. The present invention adopts the structural design of the intermittent rotation mechanism, so that the servo motor output shaft is controlled by the external control mechanism to rotate one circle, and the connecting shaft A rotates, so that 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 then moves into 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 centripetal grooves is set to four in a circular and evenly spaced structure, 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 segment block rotates relative to the limiting arc groove. The gap of the circular segment 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 segment block faces the limiting arc groove for limiting, so that the disc B will not rotate under the inertia factor, ensuring the stability of the 90-degree rotation of the intermittent rotating mechanism, and facilitating the adjustment between the tool handle injection cavity, the tool shell injection cavity, the adjustment block injection cavity and the tail block injection cavity.

[0017] 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 at the centripetal end face of the groove, the position of the push rod remains stationary. When the ball block moves relative to the adaptive guide groove at the gap between the two grooves, the ball block drives the push rod to move along the corresponding movable hole groove in the eccentric direction first. After a short pause, the ball block drives the push rod to interactively complete the lifting and return to the original position along the centripetal direction of the corresponding movable hole groove, which is used for demolding of utility knife shell parts after injection molding.

[0018] 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 drives the forward swivel to rotate forward through the limiting column B, causing the swivel column and the lifting mechanism 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 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 the utility knife shell parts after injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the utility knife structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 3 It is a schematic exploded view of the overall structure of the present invention.

[0022] Figure 4 It is a schematic diagram of the explosion structure of the upper module and the lower module of the present invention.

[0023] Figure 5 for Figure 3 Schematic diagram of part of the structure.

[0024] Figure 6 for Figure 5 A magnified schematic diagram of the local structure.

[0025] Figure 7 for Figure 5 Schematic diagram of partial structural explosion.

[0026] Figure 8 This is an exploded schematic diagram of the rotating column structure located on the lower module of the present invention.

[0027] Figure 9 for Figure 7 Schematic diagram of part of the structure of the intermittent rotation mechanism.

[0028] Figure 10 It is a partial structural diagram of the intermittent rotation mechanism of the present invention.

[0029] Figure 11 for Figure 7 Schematic diagram of part of the structure of the lifting mechanism.

[0030] Figure 12 It is a schematic cross-sectional structural diagram of the jacking mechanism of the present invention.

[0031] Figure 13 It is a schematic diagram of the exploded structure of the forward rotation mechanism and the reverse rotation mechanism of the present invention.

[0032] Figure 14 It is a schematic cross-sectional structure diagram of the forward rotation mechanism and the reverse rotation mechanism of the present invention.

[0033] Figure 15 for Figure 14 A magnified schematic diagram of the local structure.

[0034] Description of the numbers in the figure: 01. Knife handle; 02. Knife housing; 03. Adjustment block; 04. Tail block; 05. Knife groove; 1. Upper module; 2. Lower module; 3. Rotation slot; 4. Rotation column; 5. Rotation shaft; 6. Intermittent rotation mechanism; 7. Lifting mechanism; 8. Forward rotation mechanism; 9. Reverse rotation mechanism; 21. Feeding port; 22. Mounting circular groove; 23. Mounting groove; 24. Cavity; 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. Movable hole groove; 441, injection molding half groove A; 442, through groove A; 451, injection molding half groove B; 452, connecting groove B; 61. Servo motor; 62. Coupling A; 63. Coupling B; 64. Disc A; 65. Disc B; 66. Movable column; 67. Limiting arc groove; 68. Segment block; 69. Centripetal groove; 71. Spindle; 72. Groove; 73. Adaptive guide groove; 74. Ball block; 75. Ejector rod; 76. Connecting rod; 81. Outer ring; 82. Limiting protrusion A; 83. Forward swivel ring; 84. Forward arc groove; 85. Limiting cylinder A; 86. Spring A; 87. Limiting protrusion B; 91. Reverse swivel; 92. Reverse arc groove; 93. Limiting cylinder B; 94. Spring B. DETAILED DESCRIPTION

[0035] like Figures 1 to 15As 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 rotation groove 3, the rotation groove 3 is rotatably connected to the rotating column 4, a rotating shaft 5 is fixed on the rotating column 4, the rotating shaft 5 is rotatably connected to the rotation groove 3, and the rotating 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 handle injection half groove 42, a knife shell injection half groove 43, an adjustment block injection half groove 44 and a tail block injection half groove 45, a feeding port 21 is provided at the top of one side of the lower module 2, and 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 on the lower module 2 are provided. The tail block injection molding half groove 45 is communicated 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 rotation mechanism 8 is fixedly provided on the installation circular groove 22, and a reverse rotation mechanism 9 is provided on the forward rotation mechanism 8, and the reverse rotation mechanism 9 is fixedly connected to the output end of the intermittent rotating mechanism 6.

[0036] 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 position relative to the gap between the mounting groove 23 and the mounting circular groove 22 .

[0037] In an embodiment of the present invention, a column groove 46 is provided in the rotating column 4 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 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 to the tool handle injection-molded half groove 42, the tool housing injection-molded half groove 43, the adjustment block injection-molded half groove 44 and the tail block injection-molded half groove 45 located on the lower module 2.

[0038] In an embodiment of the present invention, the adjustment block injection molding half-slot 44 comprises a plurality of injection molding half-slots A441 arranged in a linear and equidistant configuration, with any two adjacent injection molding half-slots A441 interconnected by a connecting slot A442. The tail block injection molding half-slot 45 comprises a plurality of injection molding half-slots B451 arranged in a linear and equidistant configuration, with any two adjacent injection molding half-slots B451 interconnected by a connecting slot B452. The tool's adjustment block 03 and tail block 04 are relatively small relative to the handle 01 and blade housing 02, so multiple pieces are provided. After injection molding is complete, they are subsequently separated. This step is conventional and will not be described in detail here.

[0039] In an embodiment of the present invention, the intermittent rotation 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 fixed on the connecting shaft A62, and a movable column 66 is fixed on the disc A64. A disc B65 is fixed on the connecting shaft B63. The discs B65 and A64 are arranged alternately. Four centripetal grooves 69 are opened on the disc B65 in an annular equidistant structure, and the movable columns 66 cooperate with the movable discs of the centripetal grooves 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 near one end of the lifting mechanism 7 and is fixedly connected to the input end of the lifting mechanism 7. The present invention designs the structure of the intermittent rotation mechanism 6 so that the output shaft of the servo motor 61 is controlled by an external control mechanism to rotate one circle, and the connecting shaft A62 rotates, so that the disc 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 disengages to enter the eccentric end of the other centripetal groove 69. When the movable column 66 moves in the centripetal groove 69, the disc B65 drives the connecting shaft B63 to rotate. The number of centripetal grooves 69 is set to four in a circular equidistant structure, so that the disc B65 rotates exactly 90 degrees. The connecting shaft B63 located on the upper module 1 drives the corresponding rotating column 4 to rotate 90 degrees, which just completes the change of the injection cavity. The connecting shaft B63 located on the lower module 2 drives the lifting mechanism 7 to rotate 90 degrees.

[0040] In an embodiment of the present invention, a limiting arc groove 67 is provided on the disc B65 relative to any two centripetal grooves 69, and a circular segment 68 is fixedly provided at one end of the disc A64 near the limiting arc groove 67, and the circular segment 68 is movably matched with the limiting arc groove 67. Through the above arrangement, the present invention allows the disc A64 to rotate, and the circular segment 68 to rotate relative to the limiting arc groove 67. The notch of the circular segment 68 does not affect the rotation of the disc B65, and after the movable column 66 enters and moves into one of the centripetal grooves 69 and disengages, the outer edge of the circular segment 68 faces the limiting arc groove 67 to limit the position, so that the disc B65 will not rotate under the inertia factor, thereby ensuring the stability of the 90-degree rotation of the intermittent rotating mechanism 6 and facilitating the adjustment 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.

[0041] 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 number of adapting guide grooves 73 are provided on the surface of the main shaft 71 relative to the positions of the several groups 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 several push rods 75 are movably connected to the several 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 grooves 46. The connecting shaft B63 penetrates into the wall of the lower module 2 near 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 adaptive guide groove 73. When the ball block 74 moves relative to the adaptive guide groove 73 and is located at the centripetal end surface of the groove 72, the position of the push rod 75 remains stationary. When the ball block 74 moves relative to the adaptive guide groove 73 and is located at the gap between the two grooves 72, the ball block 74 drives the push rod 75 to move along the corresponding movable hole groove 47 in the eccentric direction first. After a short pause, 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 movable hole groove 47, which is used for demolding of the utility knife shell parts after injection molding.

[0042] 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, and a forward rotating ring 83 is rotatably connected to the limiting protrusion A82. The forward rotating 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 rotating ring 83. The depth of the positive arc grooves 84 gradually decreases in the clockwise direction. The positive arc grooves 84 are adapted to the shape of 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 to the shape of 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 rotating ring 83. Through the structural design of the forward rotation mechanism 8, the present invention ensures that the limiting column A85 is always located in the middle position of the reverse limiting cavity under the elastic force of the spring A86, so that when the forward rotating ring 83 rotates forward, the limiting column A85 has the force to move toward the wide part of the forward arc groove 84, which has little effect on the rotation of the forward rotating ring 83. When the forward rotating ring 83 rotates reversely, the limiting column A85 has the force to move toward the narrow part of the forward arc groove 84, causing the limiting protrusion A82 to lock the forward rotating ring 83 through the limiting column A85, so that the forward rotating ring 83 cannot rotate forward and can only rotate forward.

[0043] 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 number of reverse arc grooves 92 are provided on the outer edge surface of the reverse rotating ring 91 in a ring-shaped equidistant structure. The depth of the reverse arc groove 92 gradually decreases in the counterclockwise direction. The reverse arc groove 92 is adapted to the shape of the limiting protrusion B87, and the gap between the reverse arc groove 92 and the limiting protrusion B87 constitutes a forward limiting cavity. The 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. According to the principle of the forward rotation mechanism 8, 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 seen from the lifting mechanism 7 that the ejector rod 75 moves back and forth in the centripetal direction, which is used for demolding after injection molding of the utility knife shell parts.

[0044] 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 disc A64 and the movable column 66 rotate with the connecting shaft A62 as the axis. When the connecting shaft A62 rotates, the movable column 66 moves into 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 disc B65 drives the connecting shaft B63 to rotate, and the setting There are four centripetal grooves 69 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, which just completes 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, causing the rotating column 4 and the lifting mechanism 7 to 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; After injection molding, the servo motor 61 output shaft 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 and is 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 and is located at the gap 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 pause, the ball block 74 drives the ejector rod 75 to interact along the centripetal direction of the corresponding active hole groove 47 to complete the ejection and return to its original position. When the ejector rod 75 is ejected, the utility knife shell parts after injection molding in the injection cavity are demolded.

[0045] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection 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) located on the upper module (1) is fixedly connected to the rotating column (4) located on the upper module (1); a lifting mechanism (7) is arranged inside the rotating column (4) located 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) located on the lower module (2); a mounting circular groove (22) is provided on the lower module (2) 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).

2. The injection mold for the utility knife housing according to claim 1, characterized in that: 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).

3. The injection mold for the utility knife housing according to claim 2, characterized in that: A column slot (46) is provided in the rotating column (4) on the lower module (2), and a plurality of groups of movable hole slots (47) are provided on the column slot (46) in a linear and equidistant structure, each group of the movable hole slots (47) includes four holes arranged in a ring-shaped structure, and the four movable hole slots (47) are respectively connected to the knife handle injection molding half slot (42), the knife housing injection molding half slot (43), the adjustment block injection molding half slot (44) and the tail block injection molding half slot (45) on the lower module (2).

4. The injection mold for the utility knife housing according to claim 3, 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).

5. The injection mold for the utility knife housing according to claim 4, characterized in that: 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).

6. The injection mold for the utility knife housing according to claim 5, 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).

7. The injection mold for the utility knife housing according to claim 6, characterized in that: The lifting mechanism (7) comprises a main shaft (71), the main shaft (71) being rotatably disposed in the column groove (46), the main shaft (71) being provided with four grooves (72) in an annular structure with equal spacing, the grooves (72) being in a trapezoidal structure, and the centripetal end faces of the grooves (72) being in an arc structure, and both ends of the eccentric side of the grooves (72) being provided with chamfers, the surface of the main shaft (71) being 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) being movably connected with four ball blocks (74), the ball blocks (74) being fixedly provided with a push rod (75), and the plurality of push rods (75) being movably connected with the plurality of movable hole grooves (47) respectively.

8. The injection mold for the utility knife housing according to claim 7, characterized in that: 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).

9. The injection mold for the utility knife housing according to claim 8, 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).

10. The injection mold for the utility knife housing according to claim 9, 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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