Positioning blanking device of thermoforming machine

Abstract

The invention relates to the technical field of thermal forming equipment, in particular to a positioning blanking device of a thermal forming machine, which comprises a lower die, an upper die, a containing cylinder, a supporting plate and a fixing cylinder, the lower die is fixedly arranged, a through hole penetrating through the lower die along the vertical direction is formed in the lower die, the diameter of the through hole is consistent with that of one end of an opening of a plastic cup, and the containing cylinder is arranged in the containing cylinder. The upper die is arranged in a sliding mode in the vertical direction, and the upper die and the lower die are in sliding connection through the through hole. The containing cylinder is vertically arranged below the lower die, the containing cylinder and the through hole are coaxial, the containing cylinder can contain plastic cups, and the supporting plate is arranged in the containing cylinder in a sliding mode in the axial direction of the containing cylinder. According to the blanking die, the containing cylinder is arranged, the upper die and the lower die are arranged in a matched mode, plastic cups cut off from a material plate can enter the containing cylinder, the process of frequently taking materials from the die is reduced, the blanking efficiency can be effectively improved, meanwhile, the plastic cups in the containing cylinder fall together after being taken out, and the efficiency of the next procedure is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermoforming equipment, in particular to a positioning punching device of a thermoforming machine. Background Art

[0002] In the field of plastic water cup manufacturing, the positioning and punching process of the thermoforming machine is a key link to ensure product quality. A high-quality plastic water cup must not only have precise dimensions, but the smoothness and integrity of its edges will also greatly affect the user experience and the market competitiveness of the product.

[0003] The existing plastic cup thermoforming machine usually first thermoforms the material sheet into a plastic cup body, and then cuts the cup body on the material sheet through a punching device, and the cut cup is the plastic cup. However, the existing forming punching cannot quickly position and punch multiple cup bodies on the material sheet, resulting in low work efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide a positioning punching device for a thermoforming machine to address the problem that the efficiency and positioning accuracy of the current plastic cups are low during the punching process.

[0005] The above purpose is achieved through the following technical solutions: A positioning punching device for a thermoforming machine comprises a punching mechanism and a positioning mechanism, wherein the punching mechanism comprises a lower die and an upper die, wherein the lower die is fixedly arranged and a through hole is provided on the lower die which passes through the lower die in a vertical direction, wherein the diameter of the through hole is consistent with the diameter of one end of the opening of the plastic cup, wherein the material plate is placed on the lower die and the cup body is arranged in the through hole; wherein the upper die is slidably arranged in a vertical direction and the upper die is slidably connected with the lower die through the through hole; wherein the positioning mechanism comprises a receiving cylinder, a supporting plate, a fixing cylinder, a first spring and a control assembly, wherein the receiving cylinder is vertically arranged below the lower die and the receiving cylinder is coaxial with the through hole and can hold the plastic cup, wherein the supporting plate is arranged along the receiving cylinder to slide along the receiving cylinder. The receiving cylinder is slidably arranged in the accommodating cylinder in the axial direction, and a groove for placing the plastic cup is provided on the support plate, and the size of the groove is adapted to the bottom of the plastic cup; the fixed cylinder is arranged below the accommodating cylinder, and the fixed cylinder is coaxial with the accommodating cylinder, and the fixed cylinder can slide relative to the accommodating cylinder along the axial direction of the accommodating cylinder, one end of the first spring is arranged on the fixed cylinder, the first spring extends along the axial direction of the fixed cylinder, and the other end of the first spring is connected to the support plate, and the control component is used to control the position of the support plate in the accommodating cylinder according to the number of plastic cups in the accommodating cylinder, so that the cup body on the material plate is in full contact with the plastic cups in the accommodating cylinder.

[0006] Preferably, a first spiral groove extending along its axial direction is provided on the inner circumferential surface of the accommodating cylinder, and the pitch of the first spiral groove gradually decreases from top to bottom, and the support plate is slidably connected to the first spiral groove, and a heating wire is provided in the first spiral groove, and the heating wire extends along the rotation direction of the first spiral groove.

[0007] Preferably, the inner diameter of the fixed cylinder is consistent with the inner diameter of the accommodating cylinder, and a second spiral groove extending along its axial direction is provided on the inner circumferential surface of the fixed cylinder, the pitch of the second spiral groove gradually decreases from top to bottom, and the second spiral groove is connected to the first spiral groove, and the support plate can slide from the first spiral groove into the second spiral groove.

[0008] Preferably, a support column is provided on a surface of the upper mold close to the lower mold, and the peripheral surface of the support column contacts the inner wall of the cup body when the upper mold contacts the material plate.

[0009] Preferably, the control component includes a base plate, a first guide rod, a spring sheet, a rack plate and a locking portion, the base plate is fixedly installed in the fixed cylinder, the first spring is located between the base plate and the supporting plate, the first guide rod is slidably arranged in the fixed cylinder along the axial direction of the fixed cylinder, and one end of the first guide rod is rotatably connected to the supporting plate, the first guide rod passes through the base plate and is slidably connected to the base plate, both ends of the spring sheet are rotatably installed on the rack plate, and the middle part of the spring sheet protrudes along the radial direction of the fixed cylinder, the rack plate is slidably arranged on the first guide rod along the protruding direction of the middle part of the spring sheet, and the rack plate extends in the vertical direction; teeth are provided on the base plate, the rack plate is meshed with the base plate through the teeth, and when the rack plate is meshed with the base plate, the rack plate can move downward relative to the base plate and is restricted from moving upward; the locking portion is used to control the separation and meshing of the rack plate and the base plate.

[0010] Preferably, the locking portion includes an adjusting column, a push rod and a push block, the adjusting column is sleeved on the first guide rod, the adjusting column is slidably connected to the first guide rod, and the adjusting column is located below the fixed cylinder, one end of the push rod is fixedly mounted on the bottom end of the rack plate, the other end of the push rod is spaced apart from the rack plate and is located above the end thereof connected to the rack plate, the push rod is located below the bottom plate, the push block is fixedly mounted on a surface of the bottom plate close to the push rod, and an end of the push block close to the push rod is provided with an inclined surface, the inclined surface gradually moves away from the rack plate from the side close to the push rod to the side away from the push rod, and the push rod can be slidably connected to the inclined surface on the top block.

[0011] Preferably, the blanking mechanism also includes a second guide rod, a pressure column and a second spring. The second guide rod is arranged on the upper die in the vertical direction. The pressure column is sleeved on the second guide rod, and the pressure column is slidably arranged along the axial direction of the second guide rod. An accommodating groove is provided at one end of the pressure column close to the upper die, and the upper die is slidably arranged in the accommodating groove. The second spring is sleeved on the second guide rod, and both ends of the second spring are respectively connected to the upper die and the pressure column. When the second spring is in a natural state, the upper die is located in the accommodating groove.

[0012] Preferably, an air hole is provided on the pressure column, the air hole is communicated with the accommodating groove, and a through groove is provided on the supporting plate, and the through groove penetrates the supporting plate in the vertical direction.

[0013] Preferably, there are multiple punching mechanisms and positioning mechanisms, the lower dies in the multiple punching mechanisms are located on the same plane, and the multiple uncut cup bodies on the material sheet are arranged in one-to-one correspondence with the lower dies in the multiple punching mechanisms.

[0014] Preferably, the positioning and punching device of the thermoforming machine also includes a first connecting plate, a second connecting plate, a third connecting plate, a fourth connecting plate, a first driving mechanism, a second driving mechanism and a third driving mechanism. The first connecting plate, the second connecting plate, the third connecting plate and the fourth connecting plate are arranged in sequence along the vertical direction; the first connecting plate is connected to a plurality of second guide rods, and the first driving mechanism can drive the first connecting plate to move in the vertical direction; the second connecting plate is fixedly arranged, and a plurality of lower molds are fixedly installed on the second connecting plate; the third connecting plate is fixedly connected to a plurality of fixed cylinders, and the second driving mechanism drives the third connecting plate to move in the vertical direction; the fourth connecting plate is fixedly connected to a plurality of adjusting columns, the second guide rod passes through the fourth connecting plate and is slidably connected to the fourth connecting plate, and the third driving mechanism drives the fourth connecting plate to move in the vertical direction.

[0015] The beneficial effects of the present invention are as follows: a receiving tube is provided, and through the cooperation of the upper die and the lower die, the plastic cups cut from the material sheet will enter the receiving tube, which reduces the frequent process of taking materials from the mold and can effectively improve the punching efficiency; through the cooperation of the support plate with the first spring and the control component respectively, during the first punching, the support plate will position and support the cup body on the material sheet at a preset position in the receiving tube, and as the number of punching increases, the cup body on the material sheet that has not been punched on the lower die will be sleeved in the last punched plastic cup, and the plastic cup in the receiving tube will have a good positioning effect on the cup body on the material sheet, so that the quality difference of the plastic cups in the receiving tube is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a positioning punching device of a thermoforming machine provided in an embodiment of the present invention; Figure 2 A top view of a single blanking mechanism of a positioning blanking device of a thermoforming machine provided in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view along AA direction; Figure 4 for Figure 3 The enlarged view of point B in the middle; Figure 5 for Figure 3 Enlarged view of point C in the middle; Figure 6 for Figure 3 The enlarged view of point D in the middle; Figure 7 for Figure 3 Enlarged view of point E in the middle.

[0017] Among them: 100, lower mold; 101, upper mold; 102, through hole; 103, accommodating cylinder; 104, supporting plate; 105, fixing cylinder; 106, first spring; 110, first spiral groove; 111, second spiral groove; 112, heating wire; 113, support column; 120, fixing ring; 121, connecting rod; 122, bottom plate; 123, first guide rod; 124, spring piece; 125, rack plate; 126, adjusting column; 127, ejector rod; 128, ejector block; 130, second guide rod; 131, pressure column; 132, second spring; 133, first connecting plate; 134, second connecting plate; 135, third connecting plate; 136, fourth connecting plate; 137, accommodating groove; 140, material plate. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] like Figures 1 to 7As shown, the embodiment of the present invention provides a positioning punching device of a thermoforming machine, which is used to cut the cup body on the material plate 140, and includes a punching mechanism and a positioning mechanism. The punching mechanism includes a lower die 100 and an upper die 101. The lower die 100 is fixedly arranged, and a through hole 102 is provided on the lower die 100 and passes through the lower die 100 in the vertical direction. The diameter of the through hole 102 is consistent with the diameter of one end of the opening of the plastic cup. The material plate 140 is placed on the lower die 100, and the cup body is arranged in the through hole 102; the upper die 101 is slidably arranged in the vertical direction, and the upper die 101 and the lower die 100 are slidably connected through the through hole 102. The positioning mechanism includes a receiving cylinder 103, a supporting plate 104, a fixing cylinder 105, a first spring 106 and a control assembly. The receiving cylinder 103 is vertically arranged below the lower die 100, and the receiving cylinder 103 is coaxial with the through hole 102, and can hold the plastic cup. The edge of the plastic cup contacts the inner wall of the receiving cylinder 103. The support plate 104 is slidably arranged in the accommodating cylinder 103 along the axial direction of the accommodating cylinder 103. The support plate 104 is provided with a groove for placing the plastic cup, and the size of the groove is adapted to the bottom of the plastic cup; the fixed cylinder 105 is arranged below the accommodating cylinder 103, and the fixed cylinder 105 is coaxial with the accommodating cylinder 103, and the fixed cylinder 105 can slide relative to the accommodating cylinder 103 along the axial direction of the accommodating cylinder 103. One end of the first spring 106 is arranged on the fixed cylinder 105, and the first spring 106 extends along the axial direction of the fixed cylinder 105. The other end of the first spring 106 is connected to the support plate 104. The control component is used to control the position of the support plate 104 in the accommodating cylinder 103 according to the number of plastic cups in the accommodating cylinder 103, so that the cup body on the material plate 140 is in full contact with the plastic cups in the accommodating cylinder 103.

[0022] The receiving cylinder 103 is provided. Through the cooperation of the upper mold 101 and the lower mold 100, the plastic cup cut from the material sheet 140 will enter the receiving cylinder 103, which reduces the process of frequently taking materials from the mold and can effectively improve the punching efficiency; through the cooperation of the supporting plate 104 with the first spring 106 and the control component, during the first punching, the supporting plate 104 will position and support the cup body on the material sheet 140 at a preset position in the receiving cylinder 103, and as the number of punching increases, the cup body on the material sheet 140 that has not been punched on the lower mold 100 will be sleeved in the last punched plastic cup, and the plastic cup in the receiving cylinder 103 will have a good positioning effect on the cup body on the material sheet 140, so that the quality difference of the plastic cups in the receiving cylinder 103 is reduced. At the same time, the plastic cups in the receiving cylinder 103 have fallen into one piece after being taken out, which improves the efficiency of the subsequent process.

[0023] In this embodiment, a first spiral groove 110 extending along the axial direction is provided on the inner circumferential surface of the accommodating cylinder 103, and the pitch of the first spiral groove 110 gradually decreases from top to bottom, and the support plate 104 is slidably connected to the first spiral groove 110, and a heating wire 112 is provided in the first spiral groove 110, and the heating wire 112 extends along the rotation direction of the first spiral groove 110, and the heating wire 112 is embedded in the inner wall of the accommodating cylinder 103, and the heating wire 112 generates heat when the upper mold 101 and the lower mold 100 are closed, and the heating wire 112 can soften the burrs on the edge of the plastic cup near it; when the support plate 104 slides in the vertical direction in the accommodating cylinder 103, it will slide along the first spiral groove 110, and the heating wire 112 will be inserted into the inner wall of the accommodating cylinder 103. The rotation of the spiral groove 110 causes the plastic cup to rotate. Each time the upper die 101 punches out a plastic cup, the support plate 104 moves a certain distance in the axial direction of the receiving tube 103. Since the pitch of the first spiral groove 110 gradually decreases from top to bottom, the greater the distance between the support plate 104 and the lower die 100, the greater the angle at which the support plate 104 drives the plastic cup thereon to rotate. After the last plastic cup is punched out, the support plate 104 can rotate one circle, and the edge of the top plastic cup in the top receiving tube 103 can pass through the first spiral groove 110, and the burrs on the edge of the plastic cup are fully softened by the heating wire 112 in the first spiral groove 110.

[0024] In this embodiment, the inner diameter of the fixed cylinder 105 is consistent with the inner diameter of the accommodating cylinder 103, and the inner circumferential surface of the fixed cylinder 105 is provided with a second spiral groove 111 extending along its axial direction, the pitch of the second spiral groove 111 gradually decreases from top to bottom, and the second spiral groove 111 is connected to the first spiral groove 110, the support plate 104 can slide from the first spiral groove 110 into the second spiral groove 111, and the first spiral groove 110 and the second spiral groove 111 are provided with chamfers; when the support plate 104 enters the second spiral groove 111, it means that the plastic cups in the accommodating cylinder 103 are about to be stored full, and during the last punching, the top plastic cup in the accommodating cylinder 103 can rotate one circle in the accommodating cylinder 103, and the heating wire 112 can fully trim the burrs on the edge of the plastic cup.

[0025] In this embodiment, a support column 113 is provided on one side of the upper mold 101 close to the lower mold 100. When the upper mold 101 contacts the material plate 140, the circumferential surface of the support column 113 contacts the inner wall of the cup body. When punching, the support column 113 supports the cup body to prevent the punching die from causing deformation of the cup body when punching the material plate 140, thereby affecting the cutting quality.

[0026] A fixing ring 120 is sleeved on the accommodating cylinder 103, and the fixing ring 120 is slidably connected to the accommodating cylinder 103. A connecting rod 121 is fixedly installed on the fixing ring 120, and one end of the connecting rod 121 away from the fixing ring 120 is connected to the fixing cylinder 105. When the fixing ring 120 is separated from the accommodating cylinder 103, the fixing ring 120 and the connecting rod 121 can play a guiding role when the fixing cylinder 105 slides relative to the accommodating cylinder 103.

[0027] In this embodiment, the control assembly includes a bottom plate 122, a first guide rod 123, a spring 124, a rack plate 125 and a locking portion. The bottom plate 122 is fixedly installed in the fixed cylinder 105. The first spring 106 is located between the bottom plate 122 and the support plate 104. The first guide rod 123 is slidably arranged in the fixed cylinder 105 along the axial direction of the fixed cylinder 105, and one end of the first guide rod 123 is rotatably connected to the support plate 104. The first guide rod 123 penetrates the bottom plate 122 and is slidably connected to the bottom plate 122. Both ends of the spring 124 are rotatably installed on the rack plate 125. The rack plate 125 is on the strip plate 125, and the middle part of the spring piece 124 protrudes along the radial direction of the fixed cylinder 105. The rack plate 125 is slidably arranged on the first guide rod 123 along the protruding direction of the middle part of the spring piece 124, and the rack plate 125 extends along the vertical direction; teeth are arranged on the bottom plate 122, and the teeth on the rack plate 125 and the teeth on the bottom plate 122 are both ratchet teeth. The rack plate 125 is meshed with the bottom plate 122 through the teeth, and when the rack plate 125 is meshed with the bottom plate 122, the rack plate 125 can move downward relative to the bottom plate 122 and is restricted from moving upward. When the first guide rod 123 is moved downward by an external force, the first guide rod 123 will drive the rack plate 125 to move synchronously, and the rack plate 125 will move along the raised direction of the spring plate 124 under the action of the teeth on the bottom plate 122, and the raised part of the spring plate 124 will begin to be concave and the spring plate 124 will begin to store energy, and at the same time the first spring 106 will be compressed, and after the external force is removed, the first guide rod 123 will be pushed upward by the first spring 106 through the support plate 104, and at this time the spring plate 124 will provide the rack plate 125 with a thrust to approach the bottom plate 122, and the cooperation between the rack plate 125 and the bottom plate 122 prevents the first guide rod 123 from moving upward. The locking portion is used to control the separation and engagement of the rack plate 125 and the bottom plate 122.

[0028] In this embodiment, the locking portion includes an adjusting column 126, a push rod 127 and a push block 128. The adjusting column 126 is sleeved on the first guide rod 123, and the adjusting column 126 is slidably connected to the first guide rod 123, and the adjusting column 126 is located below the fixed cylinder 105, one end of the push rod 127 is fixedly mounted on the bottom end of the rack plate 125, and the other end of the push rod 127 is spaced from the rack plate 125 and is located above the end thereof connected to the rack plate 125, the push rod 127 is located below the bottom plate 122, and the push block 128 is fixedly mounted on a surface of the bottom plate 122 close to the push rod 127, and an end of the push block 128 close to the push rod 127 is provided with an inclined surface, the inclined surface gradually moves away from the rack plate 125 from the side close to the push rod 127 to the side away from the push rod 127, and the push rod 127 can be slidably connected to the inclined surface on the push block 128. Each time the first guide rod 123 moves downward a little relative to the bottom plate 122, the rack plate 125 and the bottom plate 122 are restricted from moving upward and reset due to the cooperation of the ratchet teeth, until the push rod 127 abuts against the adjustment column 126 and pushes the rack plate 125 away from the teeth on the bottom plate 122. When the rack plate 125 moves away from the teeth on the bottom plate 122, it pushes the middle part of the spring sheet 124 and makes it concave. After the concave, the two ends of the spring sheet 124 rotate with it until the middle part of the spring sheet 124 bulges in the opposite direction of the original bulge, and the push rod 127 no longer moves in the direction close to the adjustment column 126, and the rack plate 125 no longer meshes with the bottom plate 122.

[0029] In this embodiment, the blanking mechanism further includes a second guide rod 130, a pressure column 131 and a second spring 132. The second guide rod 130 is arranged on the upper mold 101 along the vertical direction. The second guide rod 130 is rotatably connected to the upper mold 101. After the upper mold 101 blanks the cup body on the blanking plate 140, it will push the plastic cup to slide in the accommodating cylinder 103. The plastic cup in the accommodating cylinder 103 rotates under the action of the support plate 104 and the first spiral groove 110. The rotating plastic cup will also drive the upper mold 101 to rotate, reducing the friction between the upper mold 101 and the plastic cup; the pressure column 131 is sleeved on the second guide rod 130, and the pressure column 131 is slidably arranged along the axial direction of the second guide rod 130. An accommodating groove 137 is provided at one end of the pressure column 131 close to the upper mold 101, and the upper mold 101 is slidably set in the accommodating groove 137. The second spring 132 is sleeved on the second guide rod 130, and the two ends of the second spring 132 are respectively connected to the upper mold 101 and the pressure column 131. The second spring 132 is in a natural state, and the upper mold 101 is located in the accommodating groove 137. When the upper mold 101 approaches the lower mold 100, the pressure column 131 will contact the material plate 140 on the lower mold 100 before the upper mold 101. As the upper mold 101 continues to approach the lower mold 101, the second spring 132 will be stretched, the pressure between the pressure column 131 and the lower mold 100 will increase, and the limiting force on the material plate 140 will increase.

[0030] In this embodiment, an air hole is opened on the pressure column 131, and the air hole is connected to the receiving groove 137. A through groove is opened on the support plate 104, and the through groove passes through the support plate 104 in the vertical direction. When the upper mold 101 punches the cup body on the material plate 140, the upper mold 101 will slide into the receiving tube 103. At this time, the volume of the space between the bottom plate 122 and the upper mold 101 will decrease, and the internal pressure will increase. The gas in the space between the bottom plate 122 and the upper mold 101 will flow along the first spiral groove 110 and the second spiral groove 111 to the top of the upper mold 101, and the flowing gas can clean the impurities in the first spiral groove 110 and the second spiral groove 111.

[0031] In this embodiment, multiple punching mechanisms and positioning mechanisms are provided, and the lower molds 100 in the multiple punching mechanisms are located on the same plane. The multiple uncut cup bodies on the material plate 140 are arranged one-to-one corresponding to the lower molds 100 in the multiple punching mechanisms. The multiple punching mechanisms can cut out multiple plastic cups from the material plate 140 at one time, further improving work efficiency.

[0032] In this embodiment, the positioning and blanking device of the thermoforming machine also includes a first connecting plate 133, a second connecting plate 134, a third connecting plate 135, a fourth connecting plate 136, a first driving mechanism, a second driving mechanism and a third driving mechanism. The first connecting plate 133, the second connecting plate 134, the third connecting plate 135 and the fourth connecting plate 136 are arranged in sequence along the vertical direction; the first connecting plate 133 is connected to a plurality of second guide rods 130, and the first driving mechanism can drive the first connecting plate 133 to move in the vertical direction; the second connecting plate 134 is fixedly arranged, and a plurality of lower molds 100 are fixedly installed on the second connecting plate 134, the third connecting plate 135 is fixedly connected to a plurality of fixed cylinders 105, and the second driving mechanism drives the third connecting plate 135 to move in the vertical direction; the fourth connecting plate 136 is fixedly connected to a plurality of adjustment columns 126, the second guide rod 130 passes through the fourth connecting plate 136 and is slidably connected to the fourth connecting plate 136, and the third driving mechanism drives the fourth connecting plate 136 to move in the vertical direction.

[0033] The first driving mechanism, the second driving mechanism and the third driving mechanism are power mechanisms with a linear motion function such as a hydraulic cylinder and an electric push rod.

[0034] The working principle of the positioning punching device of a thermoforming machine provided in the above embodiment is as follows: First, separate the upper die 101 and the lower die 100, then place the unpunched connecting plate on the second connecting plate 134, and place each cup body on the connecting plate into the corresponding through hole 102 of the lower die 100, and make the bottom of each cup body located in the corresponding groove on the support plate 104, and then start the first driving mechanism, which drives the second guide rod 130 to approach the lower die 100 through the first connecting plate 133, and the second guide rod 130 drives the upper die 101 and the pressure column 131 to move synchronously.

[0035] The pressure column 131 first contacts the material plate 140 on the second connecting plate 134, and the second guide rod 130 continues to approach the lower mold 100, the second spring 132 is stretched, and the pressure between the pressure column 131 and the material plate 140 increases; as the upper mold 101 continues to approach the lower mold 100, the upper mold 101 slides out of the accommodating groove 137, and the support column 113 slides into the cup body to support the cup body, and then the upper mold 101 will contact the material plate 140, and the cooperation between the upper mold 101 and the lower mold 100 will punch out a plastic cup, and the upper mold 101 continues to move in the direction close to the lower mold 100, and the plastic cup will be pushed into the accommodating tube 103, and at the same time, the upper mold 101 will push the support plate 104 to move through the plastic cup, and the support plate 104 will rotate under the action of the first spiral groove 110 while moving in the accommodating tube 103 and drive the plastic cup to rotate. When the upper mold 101 pushes the plastic cup to move in the accommodating tube 103, the heating wire 112 will be energized to generate heat, and the burrs on the edge of the plastic cup near the first spiral groove 110 will be softened by the heating wire 112. The softened burrs will be smoothly integrated with the edge of the plastic cup by the action of the inner wall of the accommodating tube 103, thereby improving the quality of the plastic cup, reducing the processing volume of subsequent processes, and improving production efficiency.

[0036] When the support plate 104 moves in the accommodating tube 103 in the direction away from the lower mold 100, the support plate 104 will drive the first guide rod 123 to move, and the first guide rod 123 will drive the rack plate 125 to move. Under the action of the bottom plate 122, the rack plate 125 continuously pushes the spring plate 124 to deform. At this moment, the spring plate 124 provides the rack plate 125 with a thrust to approach the teeth on the bottom plate 122. The rack plate 125 is meshed with the bottom plate 122, and the first spring 106 is compressed at the same time. As the number of plastic cups in the accommodating tube 103 increases, the compression degree of the first spring 106 increases continuously.

[0037] As the number of plastic cups in the accommodating cylinder 103 increases, the support plate 104 will slide from the first spiral groove 110 to the second spiral groove 111, and the support plate 104 will also enter the fixed cylinder 105. When the number of plastic cups in the accommodating cylinder 103 and the fixed cylinder 105 reaches a certain value, the first driving mechanism is stopped and the second driving mechanism is started. The second driving mechanism drives the fixed cylinder 105 to move away from the accommodating cylinder 103 through the third connecting plate 135. The fixed cylinder 105 drives the first guide rod 123 to move synchronously through the cooperation of the bottom plate 122 and the rack plate 125. The first guide rod 123 drives the support plate 104 to move, and the fixed cylinder 105 is separated from the accommodating cylinder 103. The fixed cylinder 105 drives the fixing ring 120 to slide on the accommodating cylinder 103 through the connecting rod 121. After the plastic cups in the accommodating cylinder 103 are completely out, the plastic cups that fall on one piece can be removed.

[0038] After the plastic cup is removed, the second driving mechanism is started to drive the third connecting plate 135 to move toward the lower mold 100 until the fixing cylinder 105 contacts the containing cylinder 103 .

[0039] At this time, the third driving mechanism is started, and the third driving mechanism pushes the fourth connecting plate 136 to approach the third connecting plate 135, and the adjusting column 126 approaches the rack plate 125. When the adjusting column 126 contacts the top rod 127 on the rack plate 125, the inclined setting of the top rod 127 relative to the adjusting column 126 will cause the top rod 127 to push the rack plate 125 to slide on the first guide rod 123 along the radial direction of the fixed cylinder 105. The sliding of the first guide rod 123 will push the raised part of the spring piece 124 to be concave, until the spring piece 124 is reversely raised, and the rack plate 125 is no longer engaged with the bottom plate 122, and the first spring 106 releases energy, and the first spring 106 pushes the support plate 104 to be fixed. The support plate 104 slides along the second spiral groove 111 into the first spiral groove 110, and the support plate 104 drives the rack plate 125 to approach the top block 128 through the first guide rod 123. When the top rod 127 on the rack plate 125 contacts the top block 128, the top rod 127 drives the rack plate 125 to approach the teeth on the bottom plate 122 under the action of the inclined surface of the top block 128. When the support plate 104 slides to the preset position, the middle part of the spring piece 124 is located between its two ends and the rack plate 125 under the action of the rack plate 125. The spring piece 124 can push the rack plate 125 to engage with the bottom plate 122, and then the third driving mechanism is started to reset the adjusting column 126.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A positioning punching device for a thermoforming machine, used to cut a cup body from a sheet, characterized in that: include: The punching mechanism and the positioning mechanism include a lower die and an upper die. The lower die is fixedly arranged, and a through hole is provided on the lower die which penetrates the lower die in the vertical direction. The diameter of the through hole is consistent with the diameter of one end of the opening of the plastic cup. The material plate is placed on the lower die, and the cup body is arranged in the through hole. The upper die is slidably arranged in the vertical direction, and the upper die and the lower die are slidably connected through the through hole. The positioning mechanism includes a receiving cylinder, a supporting plate, a fixing cylinder, a first spring and a control assembly. The receiving cylinder is vertically arranged below the lower die, and the receiving cylinder is coaxial with the through hole and can hold the plastic cup. The supporting plate slides along the axial direction of the receiving cylinder. The holder is movable in the accommodating cylinder, and a groove for placing the plastic cup is provided on the support plate, and the size of the groove is adapted to the bottom of the plastic cup; the fixed cylinder is arranged below the accommodating cylinder, and the fixed cylinder is coaxial with the accommodating cylinder, and the fixed cylinder can slide relative to the accommodating cylinder along the axial direction of the accommodating cylinder, one end of the first spring is arranged on the fixed cylinder, and the first spring extends along the axial direction of the fixed cylinder, and the other end of the first spring is connected to the support plate, and the control component is used to control the position of the support plate in the accommodating cylinder according to the number of plastic cups in the accommodating cylinder, so that the cup body on the material plate is in full contact with the plastic cups in the accommodating cylinder.

2. A positioning punching device for a thermoforming machine according to claim 1, characterized in that: A first spiral groove extending along the axial direction is provided on the inner circumference of the accommodating cylinder, and the pitch of the first spiral groove gradually decreases from top to bottom, and the support plate is slidably connected to the first spiral groove. A heating wire is provided in the first spiral groove, and the heating wire extends along the rotation direction of the first spiral groove.

3. A positioning punching device for a thermoforming machine according to claim 2, characterized in that: The inner diameter of the fixed cylinder is consistent with the inner diameter of the accommodating cylinder, and a second spiral groove extending along its axial direction is provided on the inner circumferential surface of the fixed cylinder. The pitch of the second spiral groove gradually decreases from top to bottom, and the second spiral groove is connected to the first spiral groove. The support plate can slide from the first spiral groove into the second spiral groove.

4. A positioning punching device for a thermoforming machine according to claim 1, characterized in that: A support column is arranged on one side of the upper die close to the lower die, and the peripheral surface of the support column contacts the inner wall of the cup body when the upper die contacts the material plate.

5. The positioning punching device of a thermoforming machine according to claim 1, characterized in that: The control assembly includes a base plate, a first guide rod, a spring sheet, a rack plate and a locking portion. The base plate is fixedly installed in the fixed cylinder, the first spring is located between the base plate and the supporting plate, the first guide rod is slidably arranged in the fixed cylinder along the axial direction of the fixed cylinder, and one end of the first guide rod is rotatably connected to the supporting plate, the first guide rod passes through the base plate and is slidably connected to the base plate, the two ends of the spring sheet are rotatably installed on the rack plate, and the middle part of the spring sheet protrudes along the radial direction of the fixed cylinder, the rack plate is slidably arranged on the first guide rod along the protruding direction of the middle part of the spring sheet, and the rack plate extends in the vertical direction; teeth are provided on the base plate, the rack plate is meshed with the base plate through the teeth, and when the rack plate is meshed with the base plate, the rack plate can move downward relative to the base plate and is restricted from moving upward; the locking portion is used to control the separation and meshing of the rack plate and the base plate.

6. A positioning punching device for a thermoforming machine according to claim 5, characterized in that: The locking part includes an adjusting column, a push rod and a push block. The adjusting column is sleeved on the first guide rod. The adjusting column is slidably connected to the first guide rod, and the adjusting column is located below the fixed cylinder. One end of the push rod is fixedly installed on the bottom end of the rack plate, and a spacing is provided between the other end of the push rod and the rack plate and is located above the end thereof connected to the rack plate. The push rod is located below the bottom plate, and the push block is fixedly installed on a surface of the bottom plate close to the push rod, and an end of the push block close to the push rod is provided with an inclined surface, which gradually moves away from the rack plate from the side close to the push rod to the side away from the push rod, and the push rod can be slidably connected to the inclined surface on the top block.

7. A positioning punching device for a thermoforming machine according to claim 6, characterized in that: The blanking mechanism also includes a second guide rod, a pressure column and a second spring. The second guide rod is arranged on the upper die in the vertical direction. The pressure column is sleeved on the second guide rod, and the pressure column is slidably arranged along the axial direction of the second guide rod. An accommodating groove is opened at one end of the pressure column close to the upper die, and the upper die is slidably arranged in the accommodating groove. The second spring is sleeved on the second guide rod, and the two ends of the second spring are respectively connected to the upper die and the pressure column. When the second spring is in a natural state, the upper die is located in the accommodating groove.

8. A positioning punching device for a thermoforming machine according to claim 7, characterized in that: The pressure column is provided with an air hole which is communicated with the containing groove; the supporting plate is provided with a through groove which penetrates the supporting plate in a vertical direction.

9. A positioning punching device for a thermoforming machine according to claim 7, characterized in that: There are multiple punching mechanisms and positioning mechanisms, the lower dies in the multiple punching mechanisms are located on the same plane, and the multiple cup bodies that have not been cut on the material plate are arranged one by one corresponding to the lower dies in the multiple punching mechanisms.

10. A positioning punching device for a thermoforming machine according to claim 9, characterized in that: It also includes a first connecting plate, a second connecting plate, a third connecting plate, a fourth connecting plate, a first driving mechanism, a second driving mechanism and a third driving mechanism. The first connecting plate, the second connecting plate, the third connecting plate and the fourth connecting plate are arranged in sequence along the vertical direction; the first connecting plate is connected to a plurality of second guide rods, and the first driving mechanism can drive the first connecting plate to move in the vertical direction; the second connecting plate is fixedly arranged, a plurality of lower molds are fixedly installed on the second connecting plate, the third connecting plate is fixedly connected to a plurality of fixed cylinders, and the second driving mechanism drives the third connecting plate to move in the vertical direction; the fourth connecting plate is fixedly connected to a plurality of adjusting columns, the second guide rod passes through the fourth connecting plate and is slidably connected to the fourth connecting plate, and the third driving mechanism drives the fourth connecting plate to move in the vertical direction.

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