A multi-head pressing tool

Abstract

The present invention relates to the technical field of automated welding tooling, and specifically to a multi-head pressing tooling. It comprises a welding machine and a pressing table that can move up and down, a plurality of welding heads are arranged at the bottom of the pressing table, a connecting ring is connected between the plurality of welding heads, and a support seat is arranged on the corresponding welding machine below the welding head, and arc-shaped ventilation slots that coincide with the edge of the packaging box are symmetrically opened on the support seat, and an airflow supply mechanism connected to the ventilation slot is arranged on the welding machine located behind the support seat, and when welding, the airflow delivered by the airflow supply mechanism is used to form a negative pressure in the ventilation slot to attract the edges of the inner and outer packaging boxes. The edge of the packaging box is restricted by a convex plate, and the expanded air cushion presses upward on the outer packaging box, and the edge of the packaging box is held against, and the negative pressure formed by the ventilation slot is used to further increase the attraction to the edge of the packaging box, thereby ensuring that the edges of the inner and outer packaging boxes are closely fitted, and preventing the edges of the inner and outer packaging boxes from being offset during welding.

Description

Technical Field

[0001] The invention relates to the technical field of automated welding tooling, in particular to a multi-head pressing tooling. Background Art

[0002] Multi-head plastic pressing tooling is widely used in various fields that require plastic pressing processing, such as automobile manufacturing, electronic appliances, furniture manufacturing, etc. Especially in occasions where mass production is required and high product quality requirements are required, multi-head plastic pressing tooling shows its unique advantages.

[0003] When welding PET packaging boxes, in order to improve the protection effect of the packaging, a double-layer PET packaging box is usually used to wrap the packaging, that is, the entire packaging box is divided into two layers, inner and outer layers. Therefore, when welding, it is necessary to connect the edge parts of the two together to form a whole.

[0004] In the prior art, in order to connect the inner and outer packaging boxes together at one time and ensure the firmness of the connection between the two, multiple pressing modules are usually used to press the edges of the packaging boxes at the same time to form multiple welding points. However;

[0005] 1. When placing the inner packaging box in the outer packaging box, this process is often done manually, which can easily cause the edge of the inner packaging box to be misaligned with the edge of the outer packaging box. When the two are pressed together, the contact area of ​​the edge welding point is reduced, resulting in cracks between the inner and outer packaging boxes;

[0006] 2. When the edge of the inner packaging box at the welding point is bent, the opposite side will be lifted during the pressing process, thus affecting the welding effect. Summary of the invention

[0007] The purpose of the present invention is to provide a multi-head pressing tool to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention aims to provide a multi-head pressing tool, including a welding machine and a pressing table which can be moved up and down, a plurality of welding heads are arranged at the bottom of the pressing table, a connecting ring is connected between the plurality of welding heads, and a support seat is arranged on the corresponding welding machine below the welding head, the support seat is symmetrically provided with arc-shaped ventilation grooves which coincide with the edges of the packaging box, an airflow supply mechanism connected with the ventilation groove is arranged on the welding machine located behind the support seat, when welding, the airflow delivered by the airflow supply mechanism is used to form a negative pressure in the ventilation groove to attract the edges of the inner and outer packaging boxes, and a limiting plate is arranged on the support seat on the outer side of each of the ventilation grooves, and a lifting mechanism is arranged on the outer edge of the support seat on the outer side of each of the limiting plates, and the lifting mechanism is used to move the limiting plate under the squeezing of the connecting ring, so as to correct the offset of the inner and outer packaging boxes after the plurality of limiting plates are matched.

[0009] As a further improvement of the present technical solution, the air flow supply mechanism includes a piston cylinder fixedly connected to the upper surface of the welding machine, and a piston rod sleeved with the piston cylinder, the top of the piston rod is fixedly connected to the pressing table, the bottom of the piston cylinder is symmetrically connected with exhaust pipes on both sides, the exhaust pipes pass through the support seat, and are connected with an air cushion arranged inside the support seat, the bottom of the piston cylinder is also connected with an air intake pipe, and a first one-way valve is arranged in both the air intake pipe and the exhaust pipe, wherein the one-way valve in the air intake pipe is used to supply external air to enter the piston cylinder, and the one-way valve in the exhaust pipe is used to supply air in the piston cylinder to enter the air cushion.

[0010] As a further improvement of the present technical solution, the outside of the air cushion is connected to the air inlet end of the three-way pipe, the negative pressure end of the three-way pipe is connected to the ventilation slot, the exhaust end penetrates the support seat and extends to the outside, and a second one-way valve is arranged inside the negative pressure end. The second one-way valve is located above the exhaust end in the horizontal direction to utilize the airflow entering the exhaust end from the air inlet end to form a negative pressure in the ventilation slot, so that the edges of the inner and outer packaging boxes fit tightly.

[0011] As a further improvement of the present technical solution, the cross-sectional width of the ventilation slot is greater than the cross-sectional width of the edge of the packaging box, so that when the packaging box is placed on the support seat frame, a channel for air circulation is left between the edge and the ventilation slot.

[0012] As a further improvement of the present technical solution, the lifting mechanism includes a bent rod with a top bent toward the central axis of the support seat and an arch rod fixedly connected to the bottom of the bent rod. The bottom of the bent rod is slidably connected to the support seat. A return spring sleeved on the bottom of the bent rod is elastically connected between the support seat and the arch rod. Under normal circumstances, the return spring is in a compressed state. The bottom of the arch rod is divided into two support rods toward the central axis of the support seat, and the support rods are used to support the outer packaging box.

[0013] As a further improvement of the present technical solution, a valve plate is fixedly connected to the arch rod, and the valve plate is used to control the opening and closing of the exhaust port of the three-way pipe. The valve plate has a notch, so that when the arch rod descends, the exhaust port overlaps with the notch to form a misalignment to achieve conduction.

[0014] As a further improvement of the present technical solution, an air supply pipe is connected to the exhaust end of the three-way pipe, and the other end of the air supply pipe is bent upward to form a bend. The air supply pipe near the bend is provided with an air hole. When the exhaust end port of the three-way pipe coincides with the notch and has not yet formed a misalignment, the air in the three-way pipe is discharged from the air hole.

[0015] As a further improvement of the present technical solution, the air in the air pipe forms two air flows, one is discharged from the air hole, and the other is transported to the bent pipe. A circular plate is slidably connected to the inside of the bent pipe, and a counterweight block is arranged above the circular plate. A connecting spring is elastically connected between the counterweight block and the circular plate, and a screw is rotatably connected to the top of the counterweight block, and a rotating plate is fixedly connected to the top of the screw. The screw is threadedly connected to the bent pipe, and under normal conditions, the rotating plate is parallel to the straight pipe of the air pipe.

[0016] As a further improvement of the present technical solution, the bending position of the bending rod squeezes the slider fixed on the outside of the limiting plate, causing the limiting plate to move inward, and a plurality of convex plates for limiting the edge of the packaging box are arranged at intervals on the inner wall of the slider, and the convex plates are higher than the edge of the inner packaging box in the initial state in the horizontal direction, and the bottom of the slider is located in a cavity opened in the support seat frame, and a compression spring is elastically connected between the slider and the inner wall of the cavity.

[0017] As a further improvement of the technical solution, the speed of air entering the air cushion is greater than the speed of air discharged, so that the air cushion gradually expands to provide support for the bottom of the outer packaging box.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the multi-head pressing tool, a convex plate is used to limit the edge of the packaging box, and the expanded air cushion applies upward pressure to the outer packaging box, so that the edge of the packaging box is supported, and the negative pressure formed by the ventilation slot is further increased to further increase the attraction to the edge of the packaging box, thereby ensuring that the edges of the inner and outer packaging boxes are tightly fitted and preventing the edges of the inner and outer packaging boxes from being offset during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a left view of the overall structure of the present invention;

[0022] Figure 3It is a schematic diagram of the structure of the support base, air cushion, air flow supply mechanism and lifting mechanism of the present invention;

[0023] Figure 4 It is a schematic diagram of the internal structure of the piston cylinder cut away from the present invention;

[0024] Figure 5 It is a schematic diagram of a partial structure of a support base cut away from the present invention;

[0025] Figure 6 For the present invention Figure 5 A is an enlarged structural diagram;

[0026] Figure 7 It is a schematic diagram of the explosion structure of the limit plate and the bent rod of the present invention;

[0027] Figure 8 It is a schematic diagram of the internal structure of the gas transmission pipe of the present invention;

[0028] Fig. 9 It is a schematic diagram of the rotating structure of the rotating plate of the present invention.

[0029] The meaning of each number in the figure is:

[0030] 100. welding machine; 101. welding head; 102. connecting ring;

[0031] 110. support seat; 111. ventilation slot;

[0032] 120. air flow supply mechanism; 121. piston cylinder; 122. piston rod; 123. first one-way valve; 124. air cushion;

[0033] 130, limit plate; 131, convex plate; 132, slider; 133, compression spring;

[0034] 140, lifting mechanism; 141, bending rod; 142, arched rod; 143, valve plate; 144, return spring;

[0035] 150. three-way pipe; 151. second one-way valve;

[0036] 160, gas pipe; 161, air hole;

[0037] 170. Rotating plate; 171. Counterweight; 172. Connecting spring; 173. Circular plate. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 1 , Figure 2 , Figure 3 As shown, a multi-head pressing tool is provided, including a welding machine 100 and a pressing table which can be moved up and down, a plurality of welding heads 101 are arranged at the bottom of the pressing table, a connecting ring 102 is connected between the plurality of welding heads 101, and a supporting seat 110 is arranged on the corresponding welding machine 100 below the welding head 101. Before welding the inner and outer packaging boxes, the outer packaging box is first placed in the hollow middle part of the supporting seat 110, and the edge of the packaging box is placed on the frame of the supporting seat 110. Similarly, the inner packaging box is placed in the outer packaging box according to the same steps.

[0040] Because the support seat 110 is symmetrically provided with arc-shaped ventilation grooves 111 that coincide with the edges of the packaging box, and the welding machine 100 located behind the support seat 110 is provided with an airflow supply mechanism 120 that is connected to the ventilation grooves 111, when welding, the airflow delivered by the airflow supply mechanism 120 is used to form a negative pressure in the ventilation grooves 111 to attract the edges of the inner and outer packaging boxes, and a limiting plate 130 is provided on the support seat 110 outside each ventilation groove 111, and a lifting mechanism 140 is provided on the outer edge of the support seat 110 outside each limiting plate 130. The lifting mechanism 140 is used to move the limiting plate 130 under the pressure of the connecting ring 102, so that multiple limiting plates 130 are matched to correct the offset of the inner and outer packaging boxes.

[0041] Therefore, in the above Figure 3 Based on and combined with Figure 4The specific structure of the airflow supply mechanism 120 is further disclosed. The airflow supply mechanism 120 includes a piston cylinder 121 fixedly connected to the upper surface of the welding machine 100, and a piston rod 122 sleeved with the piston cylinder 121. The top of the piston rod 122 is fixedly connected to the pressing table. The bottom of the piston cylinder 121 is symmetrically connected with exhaust pipes on both sides. The exhaust pipes pass through the support seat 110 and are connected with an air cushion 124 arranged inside the support seat 110. The bottom of the piston cylinder 121 is also connected with an air intake pipe. The air intake pipe and the exhaust pipe are both provided with a first one-way valve 123, wherein the one-way valve in the air intake pipe is used to supply external air to enter the piston cylinder 121, and the one-way valve in the exhaust pipe is used to supply air in the piston cylinder 121 to enter the air cushion 124. That is, when the piston rod 122 moves downward, the one-way valve in the air inlet pipe is in a closed state, and the air in the piston rod 122 is transported to the air cushion 124. On the contrary, when the welding is completed, the piston rod 122 moves upward in the opposite direction, the one-way valve in the first one-way valve 123 is closed, and the external air enters the piston cylinder 121 from the air inlet pipe to provide airflow for the next welding.

[0042] On the other hand, in order to improve the stability of the inner and outer packaging boxes during welding, Figure 5 As shown, the outside of the air cushion 124 is connected to the air inlet end of the three-way pipe 150, the negative pressure end of the three-way pipe 150 is connected to the ventilation slot 111, the exhaust end passes through the support seat 110 and extends to the outside, and a second one-way valve 151 is arranged inside the negative pressure end. The second one-way valve 151 is located above the exhaust end in the horizontal direction to utilize the airflow from the air inlet end to enter the exhaust end to form a negative pressure in the ventilation slot 111, so that the edges of the inner and outer packaging boxes fit tightly.

[0043] The cross-sectional width of the ventilation slot 111 is greater than the cross-sectional width of the edge of the packaging box, so that when the packaging box is placed on the frame of the support base 110, a channel for air circulation is left between the edge and the ventilation slot 111.

[0044] That is to say, when the inner and outer packaging boxes are placed on the support base 110, the pressing table moves downward so that the air in the piston cylinder 121 passes through the air cushion 124 and the air inlet end of the three-way pipe 150, and is finally discharged from the exhaust end. During the air discharge process, the negative pressure formed in the ventilation groove 111 attracts the edge of the upper packaging box to make the inner packaging box and the outer packaging box fit tightly.

[0045] Further, as described above, the lifting mechanism 140 is used to squeeze the limiting plate 130, so that the limiting plate 130 moves inward to limit the deviation of the edge of the packaging box. Figure 7As shown, the structure of the lifting mechanism 140 is disclosed, and the lifting mechanism 140 includes a bent rod 141 whose top is bent toward the central axis of the support seat 110 and an arched rod 142 fixedly connected to the bottom of the bent rod 141, and the bottom of the bent rod 141 is slidably connected to the support seat 110, and a reset spring 144 is elastically connected between the support seat 110 and the arched rod 142 and is sleeved on the bottom of the bent rod 141. Under normal conditions, the reset spring 144 is in a compressed state, and the bottom of the arched rod 142 is separated into two support rods in the direction of the central axis of the support seat 110, and the support rods are used to support the outer packaging box. The reason is that when the outer packaging box is first placed on the hollow part of the support seat 110, the bottom of the packaging box at this time first contacts with multiple support rods, and the air cushion 124 is located below the packaging box in the horizontal direction. Under the action of gravity, the reset spring 144 is in an elongated state.

[0046] And with Figure 2 The connecting ring 102 in the middle moves downward. When the connecting ring 102 contacts the bent end of the bent rod 141, the connecting ring 102 applies downward pressure to the bent end. Considering that the air in the exhaust end of the three-way pipe 150 needs to circulate continuously to form a continuous negative pressure at the ventilation groove 111, a valve plate 143 is fixedly connected to the arch rod 142. The valve plate 143 is used to control the opening and closing of the exhaust port of the three-way pipe 150. The valve plate 143 has a notch, so that when the arch rod 142 descends, the exhaust port overlaps with the notch to form a misalignment, thereby achieving conduction.

[0047] However, in the process that the connecting ring 102 has not yet contacted the bent rod 141, the air in the three-way pipe 150 still needs to be circulated. The reason is that if the air in the three-way pipe 150 is in a blocked state, Figure 3 The air cushion 124 in the packaging box is over-expanded, thereby affecting the descent of the packaging box. Figure 7 Based on and combined with Figure 8 and Fig. 9 As shown, an air supply pipe 160 is connected to the exhaust end of the three-way pipe 150, and the other end of the air supply pipe 160 is bent upward to form a bend. An air hole 161 is provided on the air supply pipe 160 near the bend. When the exhaust end of the three-way pipe 150 overlaps with the notch and has not yet formed a misalignment, the air in the three-way pipe 150 is discharged from the air hole 161.

[0048] Secondly, the air in the air pipe 160 forms two air flows, one is discharged from the air hole 161, and the other is transported to the bent pipe. A circular plate 173 is slidably connected inside the bent pipe, and a counterweight block 171 is arranged above the circular plate 173. A connecting spring 172 is elastically connected between the counterweight block 171 and the circular plate 173, and a screw is rotatably connected to the top of the screw, and a rotating plate 170 is fixedly connected to the top of the screw. The screw is threadedly connected to the bent pipe. Under normal conditions, the rotating plate 170 is parallel to the straight pipe of the air pipe 160.

[0049] It is worth noting that: in the horizontal direction, the rotating plate 170 is higher than the packaging box in the initial state, and the initial state refers to the inner and outer packaging boxes just being placed on the packaging box. Figure 7 A height difference is formed on the supporting rod connected to the arch rod 142 so that the rotating plate 170 will not contact the packaging box when it rotates.

[0050] Working principle: When the valve plate 143 blocks the exhaust end of the three-way pipe 150, the air in the three-way pipe 150 is transported to the air pipe 160. At this time, the airflow is divided into two streams, one for exhaust from the air hole 161, and the other pushes the circular plate 173 to move upward, so as to use the airflow as a power to apply a thrust to the counterweight block 171 upward through the connecting spring 172, so that the screw drives the rotating plate 170 to rotate. When the bent rod 141 moves downward to the notch on the valve plate 143 and coincides with the exhaust port of the three-way pipe 150, the air in the three-way pipe 150 is discharged from the port, and the rotating plate 170 rotates back to its original position in the opposite direction under the action of gravity.

[0051] Further, returning to Figure 5 Combined with Figure 6 As shown, as the height of the bending rod 141 decreases, the edge of the packaging box rests on the frame of the support seat 110, and then the bending position of the bending rod 141 squeezes the slider 132 fixed on the outside of the limiting plate 130, so that the limiting plate 130 moves inward, and the inner wall of the slider 132 is spaced apart with a plurality of convex plates 131 for limiting the edge of the packaging box, and the convex plates 131 are higher than the edge of the inner packaging box in the initial state in the horizontal direction, and the bottom of the slider 132 is located in a cavity opened in the frame of the support seat 110, and a compression spring 133 is elastically connected between the slider 132 and the inner wall of the cavity, and when the limiting plate 130 moves inward, the compression spring 133 is squeezed, and vice versa, when the welding of the packaging box is completed, the elastic potential energy of the compression spring 133 is used to push the slider 132 to reset in the reverse direction.

[0052] In addition, as air is continuously filled into the air cushion 124, during this process, the speed of air entering the air cushion 124 is greater than the speed of air discharged, causing the air cushion 124 to gradually expand to provide support for the bottom of the outer packaging box. Secondly, the convex plate 131 is used to limit the edge of the packaging box, and the expanded air cushion 124 exerts upward pressure on the outer packaging box, the edge of the packaging box is supported, and the negative pressure formed by the ventilation groove 111 further increases the attraction to the edge of the packaging box, thereby ensuring that the edges of the inner and outer packaging boxes are closely fitted, preventing the edges of the inner and outer packaging boxes from being offset during welding.

[0053] When welding is completed, when the valve plate 143 blocks the exhaust end of the three-way pipe 150 again, the above-mentioned working principle of the rotation of the rotating plate 170 is repeated again, and the rotating rotating plate 170 is used to intercept the packaging box moving upward, so that the packaging box and Figure 2The welding head 101 in the middle is detached, the return spring 144 pulls the arch rod 142 to move upward, the air in the air cushion 124 continues to be discharged, and the support rod moves upward to support the fallen packaging box and reversely support it so that the worker can take it.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-head pressing tool, characterized in that: The invention comprises a welding machine (100) and a pressing table which can be moved up and down, wherein a plurality of welding heads (101) are arranged at the bottom of the pressing table, a connecting ring (102) is connected between the plurality of welding heads (101), and a supporting seat (110) is arranged on the corresponding welding machine (100) below the welding head (101), wherein the supporting seat (110) is symmetrically provided with arc-shaped ventilation slots (111) which coincide with the edge of the packaging box, and an air flow supply mechanism (120) which is connected with the ventilation slots (111) is arranged on the welding machine (100) located behind the supporting seat (110). During welding, the airflow delivered by the airflow supply mechanism (120) is used to form a negative pressure in the ventilation slot (111) to attract the edges of the inner and outer packaging boxes, and a limiting plate (130) is provided on the support seat (110) outside each ventilation slot (111), and a lifting mechanism (140) is provided on the outer edge of the support seat (110) outside each limiting plate (130). The lifting mechanism (140) is used to move the limiting plate (130) under the pressure of the connecting ring (102), so that the multiple limiting plates (130) are aligned to correct the deviation of the inner and outer packaging boxes; The air flow supply mechanism (120) comprises a piston cylinder (121) fixedly connected to the upper surface of the welding machine (100), and a piston rod (122) sleeved with the piston cylinder (121); the top of the piston rod (122) is fixedly connected to the pressing table; the bottom of the piston cylinder (121) is symmetrically connected to exhaust pipes on both sides; the exhaust pipes penetrate the support seat (110) and are connected to an air cushion (124) arranged inside the support seat (110); the bottom of the piston cylinder (121) is also connected to an air intake pipe; the air intake pipe and the exhaust pipe are both provided with a first one-way valve (123); wherein the one-way valve in the air intake pipe is used to allow external air to enter the piston cylinder (121); and the one-way valve in the exhaust pipe is used to allow air in the piston cylinder (121) to enter the air cushion (124); The air cushion (124) is externally connected to the air inlet end of the three-way pipe (150), the negative pressure end of the three-way pipe (150) is connected to the ventilation slot (111), the exhaust end penetrates the support seat (110) and extends to the outside, and a second one-way valve (151) is provided inside the negative pressure end. The second one-way valve (151) is located above the exhaust end in the horizontal direction, so as to utilize the airflow entering the exhaust end from the air inlet end to form a negative pressure in the ventilation slot (111), so that the edges of the inner and outer packaging boxes are tightly fitted.

2. The multi-head pressing tool according to claim 1, characterized in that: The cross-sectional width of the ventilation slot (111) is greater than the cross-sectional width of the edge of the packaging box, so that when the packaging box is placed on the frame of the support seat (110), a passage for air circulation is left between the edge and the ventilation slot (111).

3. The multi-head pressing tool according to claim 1, characterized in that: The lifting mechanism (140) comprises a bent rod (141) whose top is bent toward the central axis of the support seat (110) and an arch rod (142) fixedly connected to the bottom of the bent rod (141); the bottom of the bent rod (141) is slidably connected to the support seat (110); a return spring (144) sleeved on the bottom of the bent rod (141) is elastically connected between the support seat (110) and the arch rod (142); under normal conditions, the return spring (144) is in a compressed state; the bottom of the arch rod (142) is divided into two support rods in the direction of the central axis of the support seat (110); the support rods are used to support the external packaging box.

4. The multi-head pressing tool according to claim 3 is characterized in that: A valve plate (143) is fixedly connected to the arch rod (142), and the valve plate (143) is used to control the opening and closing of the exhaust port of the three-way pipe (150). The valve plate (143) has a notch, so that when the arch rod (142) descends, the exhaust port and the notch overlap to form a misalignment, thereby achieving conduction.

5. The multi-head pressing tool according to claim 1, characterized in that: An air delivery pipe (160) is connected to the exhaust end of the three-way pipe (150), the other end of the air delivery pipe (160) is bent upward to form a bend, and an air hole (161) is provided on the air delivery pipe (160) near the bend. When the exhaust end of the three-way pipe (150) overlaps with the notch and has not yet formed a misalignment, the air in the three-way pipe (150) is discharged from the air hole (161).

6. The multi-head pressing tool according to claim 5, characterized in that: The air in the gas delivery pipe (160) forms two air flows, one of which is discharged from the air hole (161) and the other is delivered to the bent pipe. A circular plate (173) is slidably connected inside the bent pipe. A counterweight (171) is arranged above the circular plate (173). A connecting spring (172) is elastically connected between the counterweight (171) and the circular plate (173). A screw is rotatably connected to the top of the counterweight (171). A rotating plate (170) is fixedly connected to the top of the screw. The screw is threadedly connected to the bent pipe. Under normal conditions, the rotating plate (170) is parallel to the straight pipe of the gas delivery pipe (160).

7. The multi-head pressing tool according to claim 3 is characterized in that: The bent position of the bent rod (141) squeezes the slider (132) fixed on the outside of the limiting plate (130), so that the limiting plate (130) moves inward. The inner wall of the slider (132) is provided with a plurality of convex plates (131) for limiting the edge of the packaging box at intervals. The convex plates (131) are higher than the edge of the inner packaging box in the initial state in the horizontal direction. The bottom of the slider (132) is located in a cavity opened in the frame of the support seat (110), and a compression spring (133) is elastically connected between the slider (132) and the inner wall of the cavity.

8. The multi-head pressing tool according to claim 1, characterized in that: The speed of air entering the air cushion (124) is greater than the speed of air discharged, so that the air cushion (124) gradually expands to provide support for the bottom of the outer packaging box.

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