A positioning blanking device for a thermoforming machine

Abstract

The present invention relates to the technical field of thermoforming equipment, and particularly to a positioning blanking device for a thermoforming machine, which includes a lower die, an upper die, a receiving cylinder, a support plate, and a fixing cylinder. The lower die is fixedly arranged, and a through hole penetrating the lower die in the vertical direction is formed on the lower die. The diameter of the through hole is the same as the diameter of the open end of the plastic cup. The upper die is slidably arranged in the vertical direction, and the upper die is slidably connected to the lower die through the through hole. The receiving cylinder is vertically arranged below the lower die and is coaxial with the through hole, and can hold the plastic cup. The support plate is slidably arranged in the receiving cylinder along the axial direction of the receiving cylinder. By arranging the receiving cylinder and through the cooperative arrangement of the upper die and the lower die, the plastic cup cut from the material plate will enter the receiving cylinder, reducing the process of frequently taking materials from the mold, effectively improving the blanking efficiency. At the same time, the plastic cups in the receiving cylinder have fallen together after being taken out, improving the efficiency of the subsequent processes.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoforming equipment, and particularly to a positioning blanking device for a thermoforming machine. Background Art

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

[0003] The existing plastic cup thermoforming machines usually first thermoplastically form the cup body of the plastic cup on the material plate, and then cut the cup body on the material plate through a blanking device. What is cut off is the plastic cup. However, the existing forming and cutting cannot quickly position and cut multiple cup bodies on the material plate, resulting in low work efficiency. Summary of the Invention

[0004] Based on this, in view of the problems of low efficiency and positioning accuracy in the current blanking process of plastic cups, it is necessary to provide a positioning blanking device for a thermoforming machine.

[0005] The above object is achieved by the following technical solutions:

[0006] A positioning blanking device for a thermoforming machine includes a blanking mechanism and a positioning mechanism. The blanking mechanism includes a lower die and an upper die. The lower die is fixedly arranged, and a through hole penetrating the lower die in the vertical direction is opened on the lower die. The diameter of the through hole is the same as the diameter of the open end 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 is slidably connected to the lower die through the through hole. The positioning mechanism includes a receiving cylinder, a support plate, a fixed cylinder, a first spring, and a control component. The receiving cylinder is vertically arranged below the lower die and is coaxial with the through hole and can hold the plastic cup. The support plate is slidably arranged in the receiving cylinder along the axial direction of the receiving cylinder. 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 receiving cylinder and is coaxial with the receiving cylinder. The fixed cylinder can slide relative to the receiving cylinder along the axial direction of the receiving 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. The control component is used to control the position of the support plate in the receiving cylinder according to the number of plastic cups in the receiving cylinder, so that the cup body on the material plate is in full contact with the plastic cup in the receiving cylinder.

[0007] Preferably, a first spiral groove extending along the axial direction of the receiving cylinder is provided on the inner circumferential surface of the receiving cylinder, and the pitch of the first spiral groove gradually decreases from top to bottom. The support plate is slidably connected to the first spiral groove, and a heating wire is arranged in the first spiral groove and extends along the spiral direction of the first spiral groove.

[0008] Preferably, the inner diameter of the fixed cylinder is the same as that of the receiving cylinder, and a second spiral groove extending along the axial direction thereof 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 communicates with the first spiral groove. The tray can slide from the first spiral groove into the second spiral groove.

[0009] Preferably, a support column is provided on the 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.

[0010] Preferably, the control assembly includes a bottom plate, a first guide rod, a spring piece, a rack plate and a locking portion. The bottom plate is fixedly installed in the fixed cylinder. The first spring is located between the bottom plate and the tray. 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 tray. The first guide rod penetrates through the bottom plate and is slidably connected to the bottom plate. Both ends of the spring piece are rotatably installed on the rack plate, and the middle part of the spring piece 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 piece, and the rack plate extends in the vertical direction; teeth are provided on the bottom plate, and the rack plate meshes with the bottom plate through the teeth. When the rack plate meshes with the bottom plate, the rack plate can move downward relative to the bottom plate and is restricted from moving upward; the locking portion is used to control the separation and meshing of the rack plate and the bottom plate.

[0011] Preferably, the locking portion includes an adjusting column, a top rod and a top block. The adjusting column is sleeved on the first guide rod, and the adjusting column is slidably connected to the first guide rod. The adjusting column is located below the fixed cylinder. One end of the top rod is fixedly installed at the bottom end of the rack plate, and there is a gap between the other end of the top rod and the rack plate and above the end connected to the rack plate. The top rod is located below the bottom plate. The top block is fixedly installed on the surface of the bottom plate close to the top rod, and an inclined surface is provided at one end of the top block close to the top rod. The inclined surface gradually moves away from the rack plate from the side close to the top rod to the side far from the top rod. The top rod can be slidably connected to the inclined surface on the top block.

[0012] Preferably, the blanking mechanism further includes a second guide rod, a pressing column and a second spring. The second guide rod is arranged on the upper mold in the vertical direction. The pressing column is sleeved on the second guide rod, and the pressing column is slidably arranged along the axial direction of the second guide rod. A receiving groove is provided at one end of the pressing column close to the upper mold, and the upper mold is slidably arranged in the receiving groove. The second spring is sleeved on the second guide rod, and both ends of the second spring are respectively connected to the upper mold and the pressing column. In the natural state of the second spring, the upper mold is located in the receiving groove.

[0013] Preferably, an air hole is provided on the pressing column, and the air hole communicates with the receiving groove. A through groove is provided on the tray, and the through groove penetrates through the tray in the vertical direction.

[0014] Preferably, there are multiple blanking mechanisms and positioning mechanisms. The lower dies in the multiple blanking mechanisms are located on the same plane, and the multiple uncut cups on the material plate correspond to the lower dies in the multiple blanking mechanisms one by one.

[0015] Preferably, the positioning and blanking device of the thermoforming machine further 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 multiple second guide rods, and the first driving mechanism can drive the first connecting plate to move along the vertical direction; the second connecting plate is fixedly arranged, and multiple lower dies are fixedly installed on the second connecting plate. The third connecting plate is fixedly connected to multiple fixed cylinders, and the second driving mechanism drives the third connecting plate to move along the vertical direction; the fourth connecting plate is fixedly connected to multiple adjusting columns, the second guide rods penetrate through the fourth connecting plate and are slidably connected to the fourth connecting plate, and the third driving mechanism drives the fourth connecting plate to move along the vertical direction.

[0016] The beneficial effects of the present invention are as follows: By providing a receiving cylinder and through the cooperation of the upper die and the lower die, the plastic cups cut from the material plate will enter the receiving cylinder, reducing the process of frequently taking materials from the mold and effectively improving the blanking efficiency; Through the cooperation of the supporting plate with the first spring and the control component respectively, during the first blanking, the supporting plate will position and support the cups on the material plate at a preset position in the receiving cylinder. And as the number of blankings increases, the cups on the material plate that have not been blanked on the lower die will be sleeved in the previously blanked plastic cups. The plastic cups in the receiving cylinder will have a good positioning effect on the cups on the material plate, reducing the quality gap between the plastic cups in the receiving cylinder. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a positioning and blanking device of a thermoforming machine provided by an embodiment of the present invention;

[0018] Figure 2 It is a top view of a single blanking mechanism of a positioning and blanking device of a thermoforming machine provided by an embodiment of the present invention;

[0019] Figure 3 It is Figure 2 a cross-sectional view taken along the A-A direction in

[0020] Figure 4 It is Figure 3 an enlarged view of part B in

[0021] Figure 5 It is Figure 3 an enlarged view of part C in

[0022] Figure 6 It is Figure 3 an enlarged view of part D in

[0023] Figure 7 For Figure 3 the enlarged view at position E in

[0024] Wherein: 100, lower die; 101, upper die; 102, through hole; 103, receiving cylinder; 104, support 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, elastic sheet; 125, rack plate; 126, adjusting column; 127, ejector rod; 128, ejector block; 130, second guide rod; 131, pressing column; 132, second spring; 133, first connecting plate; 134, second connecting plate; 135, third connecting plate; 136, fourth connecting plate; 137, receiving groove; 140, material plate. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be 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.

[0026] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The terms "connection" and "coupling" as used in the present invention, unless otherwise clearly defined and limited, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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 should not be construed as a limitation of the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0028] Such as Figures 1 to 7As shown in the figure, an embodiment of the present invention provides a positioning blanking device for a thermoforming machine, which is used to cut out the cup body on the blanking plate 140. The positioning blanking device includes a blanking mechanism and a positioning mechanism. The blanking mechanism includes a lower die 100 and an upper die 101. The lower die 100 is fixedly arranged, and a through hole 102 penetrating the lower die 100 in the vertical direction is formed in the lower die 100. The diameter of the through hole 102 is the same as the diameter of the open end of the plastic cup. The blanking 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 is slidably connected with the lower die 100 through the through hole 102. The positioning mechanism includes a receiving cylinder 103, a supporting plate 104, a fixed cylinder 105, a first spring 106 and a control component. The receiving cylinder 103 is vertically arranged below the lower die 100 and 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 supporting plate 104 is slidably arranged in the receiving cylinder 103 along the axial direction of the receiving cylinder 103. A groove for placing the plastic cup is arranged on the supporting plate 104, and the size of the groove is adapted to the bottom of the plastic cup. The fixed cylinder 105 is arranged below the receiving cylinder 103 and is coaxial with the receiving cylinder 103. The fixed cylinder 105 can slide relative to the receiving cylinder 103 along the axial direction of the receiving cylinder 103. One end of the first spring 106 is arranged on the fixed cylinder 105. The first spring 106 extends along the axial direction of the fixed cylinder 105, and the other end of the first spring 106 is connected with the supporting plate 104. The control component is used to control the position of the supporting plate 104 in the receiving cylinder 103 according to the number of plastic cups in the receiving cylinder 103, so that the cup body on the blanking plate 140 is in full contact with the plastic cups in the receiving cylinder 103.

[0029] By arranging the receiving cylinder 103 and through the cooperation of the upper die 101 and the lower die 100, the plastic cups cut from the blanking plate 140 will enter the receiving cylinder 103, reducing the process of frequently taking materials from the mold and effectively improving the blanking efficiency. Through the cooperation of the supporting plate 104 with the first spring 106 and the control component respectively, during the first blanking, the supporting plate 104 will position and support the cup body on the blanking plate 140 at a preset position in the receiving cylinder 103. And as the number of blanking times increases, the cup bodies on the blanking plate 140 that have not been blanked on the lower die 100 will be sleeved in the previously blanked plastic cups. The plastic cups in the receiving cylinder 103 will have a good positioning effect on the cup bodies on the blanking plate 140, reducing the quality gap between the plastic cups in the receiving cylinder 103. At the same time, the plastic cups in the receiving cylinder 103 will fall together after being taken out, improving the efficiency of the subsequent process.

[0030] In this embodiment, a first helical groove 110 extending along the axial direction is provided on the inner peripheral surface of the receiving cylinder 103, and the pitch of the first helical groove 110 gradually decreases from top to bottom. The support plate 104 is slidably connected to the first helical groove 110. A heating wire 112 is provided in the first helical groove 110, and the heating wire 112 extends along the helix direction of the first helical groove 110. The heating wire 112 is embedded in the inner wall of the receiving cylinder 103. When the upper die 101 and the lower die 100 are closed, the heating wire 112 generates heat, 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 receiving cylinder 103, it will rotate along the helix direction of the first helical groove 110, causing 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 cylinder 103. Since the pitch of the first helical 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 by which the support plate 104 drives the plastic cup on it to rotate. When the last plastic cup is punched out, the support plate 104 can rotate one week, and the edges of the plastic cups at the top of the receiving cylinder 103 located at the top can all pass through the first helical groove 110, and the burrs on the peripheral surface of the edge of the plastic cup can be fully softened by the heating wire 112 in the first helical groove 110.

[0031] In this embodiment, the inner diameter of the fixed cylinder 105 is the same as that of the receiving cylinder 103, and a second helical groove 111 extending along the axial direction is provided on the inner peripheral surface of the fixed cylinder 105. The pitch of the second helical groove 111 gradually decreases from top to bottom, and the second helical groove 111 communicates with the first helical groove 110. The support plate 104 can slide from the first helical groove 110 into the second helical groove 111, and chamfers are provided on the first helical groove 110 and the second helical groove 111. When the support plate 104 enters the second helical groove 111, it indicates that the plastic cups in the receiving cylinder 103 are about to be filled. When punching for the last time, the plastic cup at the top in the receiving cylinder 103 can rotate one week in the receiving cylinder 103, and the heating wire 112 can fully trim the burrs on the edge of the plastic cup.

[0032] In this embodiment, a support column 113 is provided on the surface of the upper die 101 close to the lower die 100. When the upper die 101 contacts the material plate 140, the peripheral 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 cup body from deforming when the punching die punches the material plate 140, which affects the cutting quality.

[0033] A fixing ring 120 is sleeved on the accommodating cylinder 103. The fixing ring 120 is slidably connected to the accommodating cylinder 103. A connecting rod 121 is fixedly installed on the fixing ring 120. One end of the connecting rod 121 away from the fixing ring 120 is connected to the fixing cylinder 105. After 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.

[0034] In this embodiment, the control assembly includes a bottom plate 122, a first guide rod 123, a spring piece 124, a rack plate 125 and a locking portion. The bottom plate 122 is fixedly installed in the fixing cylinder 105. The first spring 106 is located between the bottom plate 122 and the supporting plate 104. The first guide rod 123 is slidably arranged in the fixing cylinder 105 along the axial direction of the fixing cylinder 105. One end of the first guide rod 123 is rotatably connected to the supporting plate 104. The first guide rod 123 penetrates through the bottom plate 122 and is slidably connected to the bottom plate 122. Both ends of the spring piece 124 are rotatably installed on the rack plate 125, and the middle part of the spring piece 124 protrudes along the radial direction of the fixing 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. The rack plate 125 extends in the vertical direction. Teeth are provided on the bottom plate 122. 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 an external force acts on the first guide rod 123 to move it downward, the first guide rod 123 will drive the rack plate 125 to move synchronously. When the rack plate 125 moves, it will move along the protruding direction of the spring piece 124 under the action of the teeth on the bottom plate 122. The protruding part of the spring piece 124 starts to dent and the spring piece 124 starts to store energy. At the same time, the first spring 106 will be compressed. After the external force acting on the first guide rod 123 is removed, the first guide rod 123 will receive an upward thrust from the first spring 106 through the supporting plate 104. At this time, the spring piece 124 will provide a thrust to the rack plate 125 to make it approach the bottom plate 122. The cooperation between the rack plate 125 and the bottom plate 122 makes the first guide rod 123 not move upward. The locking portion is used to control the separation and meshing of the rack plate 125 and the bottom plate 122.

[0035] In this embodiment, the locking portion includes an adjusting column 126, a push rod 127, and a top 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. The adjusting column 126 is located below the fixed cylinder 105. One end of the push rod 127 is fixedly installed at the bottom end of the rack plate 125. There is a spacing between the other end of the push rod 127 and the rack plate 125 and it is located above the end where it is connected to the rack plate 125. The push rod 127 is located below the bottom plate 122. The top block 128 is fixedly installed on the surface of the bottom plate 122 close to the push rod 127. And one end of the top block 128 close to the push rod 127 is provided with an inclined surface, and the inclined surface gradually moves away from the rack plate 125 from the side close to the push rod 127 to the side far from the push rod 127. The push rod 127 can be slidably connected to the inclined surface on the top block 128. After the first guide rod 123 moves downward relative to the bottom plate 122 by a little each time, the rack plate 125 and the bottom plate 122 will be restricted from moving upward and resetting due to the cooperation of the ratchet teeth until the push rod 127 abuts against the adjusting 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 will push the middle part of the elastic sheet 124 and cause it to have a depression. After the elastic sheet 124 has a depression, its two ends will rotate. Until the middle part of the elastic sheet 124 bulges in the opposite direction of the original bulge, the push rod 127 no longer moves in the direction close to the adjusting column 126. At this time, the rack plate 125 is no longer engaged with the bottom plate 122.

[0036] In this embodiment, the blanking mechanism further includes a second guide rod 130, a pressing column 131, and a second spring 132. The second guide rod 130 is arranged on the upper die 101 in the vertical direction. The second guide rod 130 is rotatably connected to the upper die 101. After the upper die 101 punches the cup on the blanking plate 140, it will push the plastic cup to slide in the receiving cylinder 103. And the plastic cup in the receiving 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 die 101 to rotate, reducing the friction between the upper die 101 and the plastic cup. The pressing column 131 is sleeved on the second guide rod 130, and the pressing column 131 is slidably arranged along the axial direction of the second guide rod 130. A receiving groove 137 is opened at one end of the pressing column 131 close to the upper die 101. The upper die 101 is slidably arranged in the receiving 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 die 101 and the pressing column 131. In the natural state of the second spring 132, the upper die 101 is located in the receiving groove 137. When the upper die 101 approaches the lower die 100, the pressing column 131 will contact the blanking plate 140 on the lower die 100 prior to the upper die 101. As the upper die 101 continues to approach the lower die 100, the second spring 132 will be stretched, the pressure between the pressing column 131 and the lower die 100 increases, and the limiting force on the blanking plate 140 increases.

[0037] In this embodiment, air holes are formed in the pressing column 131, and the air holes communicate with the receiving groove 137. A through groove is formed in the supporting plate 104, and the through groove penetrates the supporting plate 104 in the vertical direction. After the upper die 101 punches the cup body on the material plate 140, the upper die 101 will slide into the receiving cylinder 103. At this time, the volume of the space between the bottom plate 122 and the upper die 101 will decrease, and the internal pressure will increase. The gas in the space between the bottom plate 122 and the upper die 101 will flow upward above the upper die 101 along the first spiral groove 110 and the second spiral groove 111, and the flowing gas can clean the impurities in the first spiral groove 110 and the second spiral groove 111.

[0038] In this embodiment, there are multiple punching mechanisms and positioning mechanisms. The lower dies 100 in the multiple punching mechanisms are located on the same plane. The multiple uncut cup bodies on the material plate 140 are arranged in one-to-one correspondence with the lower dies 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 the working efficiency.

[0039] In this embodiment, the positioning and punching device of the thermoforming machine further 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 in the vertical direction; the first connecting plate 133 is connected to multiple 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 multiple lower dies 100 are fixedly installed on the second connecting plate 134. The third connecting plate 135 is fixedly connected to multiple 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 multiple adjusting columns 126, the second guide rods 130 penetrate the fourth connecting plate 136 and are 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.

[0040] The first driving mechanism, the second driving mechanism, and the third driving mechanism are power mechanisms with linear motion functions such as hydraulic cylinders and electric push rods.

[0041] The working principle of the positioning and punching device of the thermoforming machine provided in the above embodiment is as follows:

[0042] 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 on the connecting plate into the through hole 102 of the corresponding lower die 100, and make the bottom of each cup located in the groove on the corresponding supporting plate 104. Then, start the first driving mechanism. The first driving mechanism 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 pressing column 131 to move synchronously.

[0043] The pressing column 131 first contacts the material plate 140 on the second connecting plate 134. The second guide rod 130 continues to approach the lower die 100, and the second spring 132 is stretched, and the pressure between the pressing column 131 and the material plate 140 increases. As the upper die 101 continuously approaches the lower die 100, the upper die 101 slides out of the receiving groove 137, and the supporting column 113 slides into the cup to support the cup. Then, the upper die 101 will contact the material plate 140, and the cooperation between the upper die 101 and the lower die 100 will punch out a plastic cup. The upper die 101 continues to move in the direction closer to the lower die 100, and the plastic cup will be pushed into the receiving cylinder 103. At the same time, the upper die 101 will push the supporting plate 104 to move through the plastic cup. When the supporting plate 104 moves in the receiving cylinder 103, it will rotate under the action of the first spiral groove 110 and drive the plastic cup to rotate. When the upper die 101 pushes the plastic cup to move in the receiving cylinder 103, the heating wire 112 will be energized to generate heat. The burrs on the edge of the plastic cup near the first spiral groove 110 will be softened under the action of the heating wire 112, and the softened burrs will be smoothly fused with the edge of the plastic cup under the action of the inner wall of the receiving cylinder 103, improving the quality of the plastic cup, reducing the processing amount of subsequent processes, and improving the production efficiency.

[0044] When the supporting plate 104 moves in the receiving cylinder 103 in the direction away from the lower die 100, the supporting 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. The rack plate 125 continuously pushes the elastic piece 124 to deform under the action of the bottom plate 122. At this moment, the elastic piece 124 provides a thrust for the rack plate 125 to approach the teeth on the bottom plate 122. The rack plate 125 meshes with the bottom plate 122, and at the same time, the first spring 106 is compressed. As the number of plastic cups in the receiving cylinder 103 increases, the compression degree of the first spring 106 continuously increases.

[0045] As the number of plastic cups in the receiving cylinder 103 increases, the support plate 104 will slide from the first spiral groove 110 into 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 receiving cylinder 103 and the fixed cylinder 105 reaches a certain value, the first driving mechanism is stopped at this time and the second driving mechanism is started. The second driving mechanism drives the fixed cylinder 105 to move away from the receiving 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. The fixed cylinder 105 is separated from the receiving cylinder 103. The fixed cylinder 105 drives the fixed ring 120 to slide on the receiving cylinder 103 through the connecting rod 121. After all the plastic cups in the receiving cylinder 103 come out, the plastic cups that fall together can be taken off.

[0046] After taking off the plastic cups, start the second driving mechanism to drive the third connecting plate 135 to move towards the lower die 100 until the fixed cylinder 105 contacts the receiving cylinder 103.

[0047] At this time, start the third driving mechanism. The third driving mechanism pushes the fourth connecting plate 136 close to the third connecting plate 135, and the adjusting column 126 approaches the rack plate 125. When the adjusting column 126 contacts the ejector rod 127 on the rack plate 125, the inclined setting of the ejector rod 127 relative to the adjusting column 126 will cause the ejector rod 127 to push the rack plate 125 to slide on the first guide rod 123 in the radial direction of the fixed cylinder 105. The sliding of the first guide rod 123 will push the convex part of the elastic piece 124 to sink. Until the elastic piece 124 bulges reversely, the rack plate 125 and the bottom plate 122 are no longer engaged. The first spring 106 releases energy. The first spring 106 pushes the support plate 104 to slide in the fixed part. The support plate 104 slides along the second spiral groove 111 to the first spiral groove 110. The support plate 104 drives the rack plate 125 to approach the top block 128 through the first guide rod 123. When the ejector rod 127 on the rack plate 125 contacts the top block 128, the ejector 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 elastic piece 124 is located between its two ends and the rack plate 125 under the action of the rack plate 125. The elastic piece 124 can push the rack plate 125 to engage with the bottom plate 122, and then start the third driving mechanism to reset the adjusting column 126.

[0048] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, 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, it should be considered as the scope described in this specification.

[0049] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended 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, the punching mechanism includes 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 tube, a supporting plate, a fixed tube, a first spring and a control assembly, the receiving tube is vertically arranged below the lower die, and the receiving tube is coaxial with the through hole and can hold the plastic cup, the supporting plate is slidably arranged in the receiving tube along the axial direction of the receiving tube, and a groove for placing the plastic cup is provided on the supporting plate, and the size of the groove is adapted to the bottom of the plastic cup; the fixed tube is arranged below the receiving tube, and the fixed tube is coaxial with the receiving tube, and the fixed tube can slide relative to the receiving tube along the axial direction of the receiving tube, 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. The other end of the first spring is connected to the support plate. 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 completely in contact with the plastic cups in the accommodating cylinder. 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. A heating wire is provided in the first spiral groove, and the heating wire extends along the rotation direction of the first spiral groove. 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, and 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.

2. 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.

3. A positioning punching device for 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.

4. A positioning punching device for a thermoforming machine according to claim 3, 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.

5. A positioning punching device for a thermoforming machine according to claim 4, 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.

6. A positioning punching device for a thermoforming machine according to claim 5, 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.

7. A positioning punching device for a thermoforming machine according to claim 5, 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.

8. A positioning punching device for a thermoforming machine according to claim 7, 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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