Bottom opening device of bag making machine

Abstract

The utility model discloses a bottom opening device of a bag making machine. The bottom opening device comprises a rack, a bag clamping wheel rotationally arranged on the rack and a pair of bottom opening mechanisms arranged on the two sides of the bag clamping wheel. Each bottom opening mechanism comprises a bag clamping part arranged on the bag clamping wheel and a bag clamping assembly opposite to the bag clamping part. The bag clamping assembly comprises a bag clamping swing arm and a bag clamping protrusion located at the free end of the bag clamping swing arm, and the bag clamping swing arm can swing in a reciprocating mode relative to the bag clamping portion to drive the bag clamping protrusion to be switched between the clamping state and the separation state relative to the bag clamping portion. The bag clamping part is fixed to the periphery of the corresponding side of the bag clamping wheel through an elastic component, the elastic component extends in the radial direction of the bag clamping wheel, and the two ends of the elastic component are fixedly connected with the bag clamping part and the bag clamping wheel respectively. When the bag clamping protrusions are in the clamping state, the ends of the bag clamping protrusions abut against the opposite surfaces of the bag clamping parts, and the elastic components are compressed. The elastic components are arranged to play a buffering role, and rigid impact generated when the bag clamping protrusions and the bag clamping parts clamp the bag body is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bag making, especially to a bottom opening device of a bag making machine. BACKGROUND

[0002] The bag making machine is a device for producing and manufacturing packaging bags in the prior art. In the bag making forming process, a sheet material needs to be pasted into a cylindrical shape first, then cut into individual packaging bag bodies one by one by a cutting device, and then the packaging bag bodies are pressed and delivered to a bottom opening device for opening the bottom, then the packaging bag bodies with the opened bottom are delivered to a gluing device for gluing, and then the packaging bag bodies with the glued bottom are delivered to a bottom sealing device for sealing the bottom, so as to make a complete packaging bag.

[0003] The existing bottom opening device usually adopts a large hub component and a bottom opening mechanism to open the bottom. The common bottom opening mechanism clamps one side of the bottom of the packaging bag through the clamping bag part and the clamping bag protrusion on the clamping bag wheel. However, the existing clamping bag part is fixedly arranged on the clamping bag wheel or is part of the clamping bag wheel. During the clamping process, the clamping bag protrusion has relative contact and relative separation actions with respect to the clamping bag part. For example, a forming mechanism for square bottom packaging bags disclosed in Chinese Patent No. CN212472596U switches the clamping bag protrusion with respect to the clamping bag part between the clamping state and the separation state through the guide wheel extrusion adjusting cam. However, the clamping bag protrusion and the clamping bag part are prone to rigid impact when clamping the bag bottom, which causes the clamping bag part to be easily damaged or the clamping bag protrusion to be broken. SUMMARY

[0004] The purpose of the present application is to solve the problem that the clamping bag protrusion and the clamping bag part are prone to rigid impact when clamping the bag bottom in the prior art, which causes the clamping bag part to be easily damaged or the clamping bag protrusion to be broken.

[0005] To solve the above technical problems, the embodiment of the present application discloses a bottom opening device of a bag making machine, which comprises a rack, a clamping bag wheel rotatably arranged on the rack, and a pair of bottom opening mechanisms arranged on both sides of the clamping bag wheel.

[0006] The pair of bottom opening mechanisms are arranged on both sides of the packaging bag in the bag body width direction. Each bottom opening mechanism comprises a clamping bag part arranged on the outer periphery of the corresponding side of the clamping bag wheel, and a clamping bag assembly arranged on the outer side of the clamping bag wheel and opposite to the clamping bag part. The clamping bag assembly comprises a clamping bag swing arm and a clamping bag protrusion at the free end of the clamping bag swing arm. The clamping bag swing arm can reciprocally swing relative to the clamping bag part, and drive the clamping bag protrusion to switch between the clamping state and the separation state relative to the clamping bag part.

[0007] The bag clamping part is fixed to the corresponding side outer periphery of the bag clamping wheel through an elastic member, the elastic member extends along the radial direction of the bag clamping wheel, and both ends are fixedly connected with the bag clamping part and the bag clamping wheel respectively; when the bag clamping protrusion is in the clamping state, the end of the bag clamping protrusion abuts against the opposite surface of the bag clamping part, and the elastic member is compressed.

[0008] By adopting the above technical scheme, when the bag clamping protrusion is in the clamping state and abuts against the opposite surface of the bag clamping part, the elastic member is compressed and deformed, the rigid impact of the bag clamping protrusion when contacting the bag clamping part is converted into the elastic potential energy of the elastic member, thereby playing a buffering role, so that the rigid impact of the bag clamping protrusion and the bag clamping part when clamping the bag body of the packaging bag is avoided, the elastic member also pushes the bag clamping part to reset and clamp the bag body after elastic deformation, thereby avoiding wear of the bag clamping part and preventing the bag clamping protrusion from being broken, and the service life of the bag clamping part and the bag clamping protrusion is effectively improved.

[0009] Further preferably, the side outer periphery of the bag clamping wheel is provided with a mounting groove, and the bag clamping part is movably arranged in the mounting groove in the radial direction. The elastic member is a coil spring, one end of the coil spring is fixed to the bottom wall of the bag clamping part, and the other end is fixed to the bottom wall of the mounting groove.

[0010] By adopting the above technical scheme, the elastic member is set as a coil spring, which has a simple structure, is convenient to install and use, and has a relatively low cost.

[0011] Further preferably, the end of the bag clamping wheel abutting against the coil spring is further provided with an adjusting member, and the bottom wall of the mounting groove is further provided with an adjusting groove extending along the radial direction of the bag clamping wheel, and the adjusting member is movably fitted in the adjusting groove in the radial direction.

[0012] By adopting the above technical scheme, the initial compression amount of the coil spring can be adjusted by operating the adjusting member, and the size of the initial elastic force between the coil spring and the bag clamping part can be adjusted to adapt to the clamping requirements of different bag types.

[0013] Further preferably, the edge of the bag clamping part is clamped and fitted with the edge of the mounting groove, and when the bag clamping protrusion is in the separated state, the outer peripheral wall of the bag clamping part and the outer peripheral wall of the bag clamping wheel are smoothly transitioned.

[0014] The edge of the bag clamping part is clamped and matched with the edge of the mounting groove. When the bag clamping protrusion is separated from the bag clamping part, the bag clamping part is in an initial state, and the outer peripheral wall of the bag clamping part is smoothly connected with the outer peripheral wall of the bag clamping wheel. In fact, the outer peripheral wall of the bag clamping part constitutes part of the outer peripheral wall of the bag clamping wheel. When the bag clamping protrusion contacts the bag clamping part, the bag clamping part is slightly displaced relative to the bag clamping wheel under the action of the bag clamping protrusion and the compression spring is compressed, and the compression spring applies a reaction force to the bag clamping part, so that the bag clamping part and the bag clamping protrusion clamp the bag body. When the bag clamping protrusion is separated from the bag clamping part, the bag clamping part is reset, and the outer peripheral wall of the bag clamping part is flush with the outer peripheral wall of the bag clamping wheel.

[0015] The bag clamping part is further provided with a guide member on the side close to the bag clamping wheel, and the bag clamping wheel is provided with a guide groove matched with the guide member. The guide member extends in the radial direction of the bag clamping wheel and can move in the guide groove.

[0016] The guide member can guide the bag clamping part to ensure that the movement of the bag clamping part under compression or reset is movement in the radial direction of the bag clamping wheel, so as to accurately clamp or release the bag body.

[0017] The bag clamping wheel further has a rotating shaft mounting part on the outer side in the axial direction, and the rotating shaft mounting part rotates synchronously with the bag clamping wheel.

[0018] Each bag clamping assembly further comprises a bag clamping rotating shaft rotatably arranged on the rotating shaft mounting part. One end of the bag clamping swing arm is fixedly arranged on the bag clamping rotating shaft and extends in the same direction as the radial direction of the bag clamping wheel. The bag clamping protrusion is fixedly arranged on the other end of the bag clamping swing arm away from the bag clamping rotating shaft and extends towards the bag clamping wheel. The rotating shaft of the bag clamping rotating shaft is perpendicular to the axial direction of the bag clamping wheel.

[0019] The bag clamping rotating shaft is sleeved with a reset coil spring. One end of the reset coil spring is fixed to the rotating shaft mounting part, and the other end is fixed to the bag clamping swing arm. The outer side of the rotating shaft mounting part away from the bag clamping wheel is further provided with a guide ring groove open to the bag clamping assembly, and the guide ring groove is arranged on the rack. The circumferential side wall of the guide ring groove is provided with an abutting portion protruding into the guide ring groove in the radial direction.

[0020] The other end of the bag clamping swing arm away from the bag clamping protrusion is further provided with a cam shaft protruding into the guide ring groove. The end of the cam shaft is rotatably provided with an abutting roller rotatably arranged in the guide ring groove and movable along the guide ring groove with the rotation of the bag clamping wheel.

[0021] When the abutting roller moves along the guide ring groove to the abutting part and is extruded by the abutting part, the bag clamping swing arm swings around the bag clamping shaft so that the bag clamping protrusion is in a separated state relative to the bag clamping part; when the abutting roller moves along the guide ring groove to leave the abutting part, the bag clamping swing arm swings around the bag clamping shaft under the action of the reset coil spring so that the bag clamping protrusion is in a clamped state relative to the bag clamping part.

[0022] Further preferably, the abutting part is an abutting protrusion detachably arranged on the inner wall of the guide ring groove, and the abutting protrusion and the inner wall of the guide ring groove are smoothly connected.

[0023] By using the above technical scheme, the abutting protrusion and the inner wall of the guide ring groove are smoothly connected, and when the abutting roller moves in the guide ring groove, shaking can be avoided and the movement precision can be improved.

[0024] The embodiment of the application further discloses an opening bottom device of a bag making machine, the bag clamping part extends along the outer peripheral end surface of the bag clamping wheel, and air suction components are further arranged on both sides of the bag clamping part, and the outer end surface of the air suction component is flush with the outer peripheral end surface of the bag clamping wheel.

[0025] By using the above technical scheme, the air suction components arranged on both sides of the bag clamping part can suck the bag body of the packaging bag, the bag clamping protrusion and the bag clamping part can more conveniently clamp the bag body, and the success rate of clamping the bag body by the bag clamping protrusion is improved.

[0026] The embodiment of the application further discloses an opening bottom device of a bag making machine, the bag clamping wheel and the opening bottom mechanism are fixedly arranged on the opening bottom shaft, and an auxiliary opening bottom cam is further arranged on the opening bottom shaft and located at the middle part of the pair of opening bottom mechanisms.

[0027] The air suction component is further arranged on the auxiliary opening bottom cam, and a bag blocking rod is further arranged on the radial side of the auxiliary opening bottom cam and fixedly arranged on the opening bottom shaft.

[0028] By using the above technical scheme, the air suction component arranged on the auxiliary opening bottom cam can suck the middle part of the bag body; when the packaging bag has a large width, the bag clamping parts and the bag clamping protrusions of the pair of opening bottom mechanisms located on both sides of the width direction of the bag body can clamp the bag bodies on both sides of the packaging bag, and the suction of the middle part of the bag body by the air suction component is cooperated, so that the part close to the bag bottom of the packaging bag can be reliably clamped or sucked through the synergistic effect of the three parts, thereby facilitating the opening bottom operation. In addition, the bag blocking rod cooperates with the auxiliary opening bottom cam and can limit and stop the bag body, thereby effectively preventing the bag body from being deviated or misaligned during the operation.

[0029] The beneficial effects of the application are as follows:

[0030] The utility model discloses a kind of bottom opening devices of bag making machine, elastic member is arranged between bag clamping part and bag clamping wheel, when bag clamping protrusion is in clamping state and abuts on the opposite surface of bag clamping part, elastic member will be compressed and deformed, the rigid impact when bag clamping protrusion contacts bag clamping part is converted into the elastic potential energy of elastic member, play buffering effect, avoid the abrasion of bag clamping part, bag clamping protrusion can also be prevented from being broken simultaneously, effectively improve the service life of bag clamping part and bag clamping protrusion, and still be provided with adjusting member can adjust the initial compression of elastic member, to reach the purpose of adjusting the size of initial elastic force between helical spring and bag clamping part, to adapt to the clamping needs of different bag type. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The overall structure schematic diagram of the bottom opening device of bag making machine provided by the utility model embodiment is shown;

[0032] Figure 2 The partial structure schematic diagram of the bottom opening mechanism of the bottom opening device of bag making machine provided by the utility model embodiment is shown;

[0033] Figure 3 The partial structure schematic diagram of bag clamping wheel and bag clamping part of the bottom opening device of bag making machine provided by the utility model embodiment is shown;

[0034] Figure 4 The partial structure schematic diagram of bag clamping wheel and bag clamping assembly of the bottom opening device of bag making machine provided by the utility model embodiment is shown;

[0035] Figure 5 The overall structure schematic diagram of bag clamping wheel and bag clamping assembly of the bottom opening device of bag making machine provided by the utility model embodiment is shown;

[0036] Figure 6 The partial structure schematic diagram of the bottom opening device of bag making machine provided by the utility model embodiment is shown.

[0037] Mark explanation:

[0038] 100, rack;

[0039] 200, bag clamping wheel;

[0040] 210, bag clamping part;220, elastic member;230, installation slot;240, adjusting member;250, guide member;260, pivot mounting portion;270, air suction component;

[0041] 300, bottom opening mechanism;

[0042] 310, bag clamping assembly;

[0043] 311, bag clamping swing arm; 312, bag clamping protrusion; 313, bag clamping pivot; 314, reset coil spring; 315, camshaft; 316, abutting roller;

[0044] 400, guide ring groove;

[0045] 410, abutting portion; 420, guide wheel;

[0046] 500, open-bottom pivot;

[0047] 600, auxiliary open-bottom cam;

[0048] 610, bag blocking rod. DETAILED DESCRIPTION

[0049] The bag making machine disclosed in the present application needs to paste the sheet material into a cylindrical shape and cut it into individual packaging bag bodies during the production process, and then open the bottom and seal the bottom of the cylindrical packaging bag body. An open-bottom device is needed during the opening process. Common open-bottom devices are large hub components and open-bottom mechanisms that cooperate to open the bottom. The open-bottom mechanism is provided with a bag clamping protrusion that switches between a clamping state and a separation state relative to the bag clamping portion to clamp the bag bottom for opening operation. However, the rigid impact of the bag clamping protrusion and the bag clamping portion when clamping the bag bottom can easily damage the bag clamping portion or break the bag clamping protrusion.

[0050] To solve this problem, the present application discloses an open-bottom device of a bag making machine. An elastic member is arranged on the bag clamping portion. When the bag clamping protrusion and the bag clamping portion are in contact and clamped, the elastic member arranged on the bag clamping portion will be elastically deformed to produce a buffer, thereby avoiding the rigid impact of the bag clamping protrusion and the bag clamping portion, to avoid damage to the bag clamping portion or breakage of the bag clamping protrusion, and improve the service life of the open-bottom device.

[0051] It should be noted that the material of the packaging bag made by the bag making machine disclosed in the present application is not limited and can be plastic, paper, non-woven fabric, leather, etc.

[0052] Next, the open-bottom device of the bag making machine disclosed in the present application will be explained and described more clearly and in detail.

[0053] Please refer to Figure 1The application discloses a bottom opening device of a bag making machine, which comprises a rack 100, bag clamping wheels 200 and a pair of bottom opening mechanisms 300. The two bag clamping wheels 200 are rotatably arranged on the rack 100, and the pair of bottom opening mechanisms 300 are arranged on the two sides of the bag clamping wheels 200. Specifically, a rotatable bottom opening rotating shaft 500 is arranged on the rack 100, the two bag clamping wheels 200 and the pair of bottom opening mechanisms 300 are fixedly arranged on the bottom opening rotating shaft 500, one bottom opening mechanism 300 is arranged on one side of each bag clamping wheel 200, the two bag clamping wheels 200 and the pair of bottom opening mechanisms 300 rotate along with the rotation of the bottom opening rotating shaft 500, and the bottom opening operation is performed on the packaging bag. Specifically, in the embodiment, the bottom opening rotating shaft 500 can be driven by a separate power source, for example, a driving motor, and the embodiment does not make specific limitation on this.

[0054] Specifically, referring to Figure 1 The pair of bottom opening mechanisms 300 are arranged at intervals on the bottom opening rotating shaft 500 and correspondingly arranged on the two sides of the packaging bag in the width direction of the bag body. Further, referring to Figure 2 Each bottom opening mechanism 300 comprises a bag clamping part 210 arranged on the outer periphery of the corresponding side of the bag clamping wheel 200 and a bag clamping assembly 310 arranged on the outer side of the bag clamping wheel 200 and opposite to the bag clamping part 210. The bag clamping assembly 310 comprises a bag clamping swing arm 311 and a bag clamping protrusion 312 located at the free end of the bag clamping swing arm 311. The bag clamping swing arm 311 can reciprocally swing relative to the bag clamping part 210 and drive the bag clamping protrusion 312 to switch between the clamping state and the separation state relative to the bag clamping part 210.

[0055] It should be noted that, referring to Figure 2 The bag clamping part 210 is arranged on one side of the radial outer periphery of the bag clamping wheel 200, and the bag clamping part 210 is formed as part of the bag clamping wheel 200. When the bag clamping swing arm 311 swings, it drives the bag clamping protrusion 312 to swing.

[0056] Further referring to Figure 3 And Figure 4 The bag clamping part 210 is fixed to the corresponding side of the outer periphery of the bag clamping wheel 200 through an elastic member 220. The elastic member 220 extends along the radial direction of the bag clamping wheel 200 and is fixedly connected to the bag clamping part 210 and the bag clamping wheel 200 at both ends. When the bag clamping protrusion 312 is in the clamping state, the end of the bag clamping protrusion 312 abuts against the opposite surface of the bag clamping part 210, and the elastic member 220 is compressed.

[0057] Specifically, in the embodiment, the elastic member 220 can be a metal elastic member, such as a spiral spring, or an elastic rubber product, such as a rubber spring, or a plastic elastic piece, and the embodiment does not make unique limitation on this.

[0058] With the structure, when the bag clamping protrusions 312 are in the clamping state and abut against the opposite surface of the bag clamping part 210, the elastic member 220 is compressed and deformed, the rigid impact of the bag clamping protrusions 312 when contacting the bag clamping part 210 is converted into the elastic potential energy of the elastic member 220, and the elastic member 220 plays a buffering role, thereby avoiding rigid impact of the bag clamping protrusions 312 and the bag clamping part 210 when clamping the bag body of the packaging bag, and the elastic member 220 also pushes the bag clamping part 210 to reset and clamp the bag body after elastic deformation, avoiding excessive wear of the bag clamping part 210 and preventing the bag clamping protrusions 312 from being broken, effectively improving the service life of the bag clamping part 210 and the bag clamping protrusions 312.

[0059] Further preferably, referring to Figure 3 , the bag clamping wheel 200 is provided with a mounting groove 230 on one side of the outer periphery, and the bag clamping part 210 is movably arranged in the mounting groove 230 in the radial direction. The elastic member 220 is a coil spring, one end of the coil spring is fixed to the bottom wall of the bag clamping part 210, the other end is fixed to the bottom wall of the mounting groove 230, and the number and specific specifications of the coil spring can be designed and selected according to actual needs, for example, one, two or other number of coil springs can be arranged, and the present embodiment does not make specific limitations.

[0060] It also needs to be explained that the one side of the outer periphery of the bag clamping wheel 200 refers to the position close to the radial outer peripheral end face, the position of the mounting groove 230 is matched with the bag clamping part 210, and the bag clamping part 210 is movably arranged in the mounting groove 230 in the radial direction, for example, when the end of the bag clamping protrusion 312 abuts against the opposite surface of the bag clamping part 210, the bag body of the packaging bag is clamped, and the bag clamping part 210 will produce a small displacement in the radial direction and compress the coil spring, and the rigid impact is buffered and absorbed through the elastic deformation of the coil spring. The elastic member 220 is a coil spring, which has a simple structure, is convenient to install and use, and has a relatively low cost.

[0061] Further preferably, referring to Figure 3 , the end of the bag clamping wheel 200 abutting against the coil spring is further provided with an adjusting member 240, and the bottom wall of the mounting groove 230 is further provided with an adjusting groove extending in the radial direction of the bag clamping wheel 200, and the adjusting member 240 is movably matched in the adjusting groove in the radial direction.

[0062] With the structure, the initial compression amount of the coil spring can be adjusted by operating the adjusting member 240, and the size of the elastic force between the coil spring and the bag clamping part 210 can be adjusted. Specifically, the adjusting member 240 can be an adjusting nut, an adjusting bolt or other adjusting member, for example, an internal hex adjusting bolt can be arranged for adjustment.

[0063] Further preferably, referring to Figure 2 and Figure 5 , the edge of the bag clamping part 210 is in clamping fit with the edge of the mounting groove 230, the edge of the mounting groove 230 is slightly larger than the edge of the bag clamping part 210 in the radial direction, so as to leave a gap for the displacement of the bag clamping part 210 in the radial direction, for example, the gap size can be 1mm, 2mm or other specific size, and when the bag clamping protrusion 312 is in the separated state, the outer peripheral wall of the bag clamping part 210 is smoothly transitioned with the outer peripheral wall of the bag clamping wheel 200, and at this time the bag clamping part 210 constitutes part of the bag clamping wheel 200.

[0064] With the design of this structure, the edge of the bag clamping part 210 is in clamping fit with the edge of the mounting groove 230, when the bag clamping protrusion 312 and the bag clamping part 210 are separated, the bag clamping part 210 is in the initial state, at this time the outer peripheral wall of the bag clamping part 210 is smoothly transitioned with the outer peripheral wall of the bag clamping wheel 200, the outer peripheral wall of the bag clamping part 210 actually constitutes part of the outer peripheral wall of the bag clamping wheel 200, when the bag clamping protrusion 312 and the bag clamping part 210 are in contact, the bag clamping part 210 is displaced relative to the bag clamping wheel 200 under the action of the bag clamping protrusion 312 and the compression of the helical spring, and the helical spring will exert a reaction force on the bag clamping part 210, so that the bag clamping part 210 and the bag clamping protrusion 312 clamp the bag body, after the bag clamping protrusion 312 and the bag clamping part 210 are separated, the bag clamping part 210 will reset and the outer peripheral wall of the bag clamping part 210 and the outer peripheral wall of the bag clamping wheel 200 are flush.

[0065] The embodiment also discloses an opening bottom device of a bag making machine, referring to Figure 3 and Figure 4 , the side close to the bag clamping wheel 200 of the bag clamping part 210 is also fixedly provided with a guide member 250, and the bag clamping wheel 200 is provided with a guide groove matched with the guide member 250. The guide member 250 extends along the radial direction of the bag clamping wheel 200 and is movable in the guide groove.

[0066] With the design of this structure, the guide member 250 can guide the bag clamping part 210, so as to ensure that the movement of the bag clamping part 210 caused by compression or resetting is movement along the radial direction of the bag clamping wheel 200. The guide member 250 can be a guide rod, and preferably two guide rods are provided in the embodiment.

[0067] The embodiment also discloses an opening bottom device of a bag making machine, referring to Figure 4 and Figure 5 , the bag clamping wheel 200 further has a rotating shaft mounting part 260 on the outside in the axial direction, and the rotating shaft mounting part 260 rotates synchronously with the bag clamping wheel 200.

[0068] Please refer toFigure 4 and Figure 5 Each bag clamping assembly 310 further comprises a bag clamping pivot shaft 313 rotatably arranged on the pivot shaft mounting portion 260, for example, the bag clamping pivot shaft 313 can be rotatably arranged on the pivot shaft mounting portion 260 through a pivot, a bearing or other means, one end of the bag clamping swing arm 311 is fixedly arranged on the bag clamping pivot shaft 313 and extends in the same direction as the radial direction of the bag clamping wheel 200, and the bag clamping protrusion 312 is fixedly arranged on the other end of the bag clamping swing arm 311 away from the bag clamping pivot shaft 313 and extends towards the bag clamping portion 210 on the bag clamping wheel 200.

[0069] The rotation axis of the bag clamping pivot shaft 313 is perpendicular to the axial direction of the bag clamping wheel 200 and also perpendicular to the radial direction of the bag clamping wheel 200, and has a structure that when the bag clamping pivot shaft 313 rotates relative to the pivot shaft mounting portion 260, it can drive the bag clamping swing arm 311 to drive the bag clamping protrusion 312 to reciprocate in the radial direction of the bag clamping wheel 200. It should be noted that the specific swing angle of the bag clamping swing arm 311 can be designed according to requirements, for example, it can be 10°, 15°, etc., and the present embodiment does not make specific limitations.

[0070] Continuing to refer to Figure 4 and Figure 5 A reset coil spring 314 is sleeved on the bag clamping pivot shaft 313, one end of the reset coil spring 314 is fixed on the pivot shaft mounting portion 260 and the other end is fixed on the bag clamping swing arm 311. Specifically, for example, the reset coil spring 314 has two legs, one of the two legs is fixed on the pivot shaft mounting portion 260 and the other is fixed on the bag clamping swing arm 311. For example, when the reset coil spring 314 is installed and sleeved on the bag clamping pivot shaft 313, it is compressed, then the bag clamping pivot shaft 313 and the bag clamping swing arm 311 have a tendency to move towards the side of the bag clamping portion 210, and when there is no external force, the bag clamping swing arm 311 moves towards the side of the bag clamping portion 210, and the bag clamping protrusion 312 and the bag clamping portion 210 abut together.

[0071] The outer side of the pivot shaft mounting portion 260 away from the bag clamping wheel 200 is further provided with a guide ring groove 400 open towards the bag clamping assembly 310. Specifically, referring to Figure 2 and Figure 6 In the present embodiment, a guide wheel 420 is arranged on the outer side of the pivot shaft mounting portion 260 away from the bag clamping wheel 200, and the guide ring groove 400 is arranged on the guide wheel 420, and referring to Figure 1The guide wheel 420 is fixedly arranged on the rack 100 through a cross bar which is arranged on the rack 100 in an extending manner, and the open-bottom rotating shaft 500 is rotatably arranged through the guide wheel 420, but cannot drive the guide wheel 420 to rotate, so that the guide wheel 420 and the guide groove are fixedly arranged relative to the bag clamping wheel 200. In addition, the circumferential side wall of the guide ring groove 400 is provided with an abutting portion 410 which protrudes into the guide ring groove 400 along the radial direction.

[0072] Continuing to refer to Figure 4 and Figure 5 The end of the bag clamping swing arm 311 away from the bag clamping protrusion 312 is further provided with a cam shaft 315 which protrudes into the guide ring groove 400, and the end of the cam shaft 315 is rotatably provided with an abutting roller 316 which is rotatably arranged in the guide ring groove 400 and can move along the guide ring groove 400 with the rotation of the bag clamping wheel 200. Specifically, the open-bottom rotating shaft 500 drives the bag clamping wheel 200 and the bag clamping assembly 310 to rotate, but the guide wheel 420 and the guide ring groove 400 are fixed, so that the abutting roller 316 can move in the guide ring groove 400, and the abutting roller 316 moves in the guide ring groove 400 in a whole-circle track.

[0073] Please refer to Figure 2 and Figure 5 When the abutting roller 316 moves to the abutting portion 410 in the guide ring groove 400 and is pressed by the abutting portion 410, the cam shaft 315 drives the bag clamping swing arm 311 to swing around the bag clamping rotating shaft 313, and makes the bag clamping swing arm 311 and the bag clamping rotating shaft 313 overcome the elastic force of the reset coil spring 314, so that the bag clamping protrusion 312 is in a separated state relative to the bag clamping portion 210. When the abutting roller 316 moves away from the abutting portion 410 in the guide ring groove 400, the bag clamping swing arm 311 swings around the bag clamping rotating shaft 313 under the action of the reset coil spring 314, so that the bag clamping protrusion 312 is in a clamped state relative to the bag clamping portion 210.

[0074] For example, in the actual open-bottom process, when the open-bottom rotating shaft 500 drives the bag clamping wheel 200 and the open-bottom mechanism 300 to rotate one circle, the bag clamping swing arm 311 swings once, and the bag clamping protrusion 312 switches between the clamped state and the separated state relative to the bag clamping portion 210 once.

[0075] Further preferably, the abutting portion 410 is arranged as an abutting protrusion which is detachably arranged on the inner wall of the guide ring groove 400, and the abutting protrusion and the abutting portion of the inner wall of the guide ring groove 400 are smoothly connected.

[0076] With this structure, the abutting protrusion and the abutting portion of the inner wall of the guide ring groove 400 are smoothly connected, and when the abutting roller 316 moves in the guide ring groove 400, the shaking can be avoided and the movement precision can be improved.

[0077] The embodiment of the present application also discloses a bottom opening device of the bag making machine. Figure 2 Figure 5 The bag clamping part 210 extends along the outer circumferential end surface of the bag clamping wheel 200, and air suction parts 270 are arranged on both sides of the bag clamping part 210, and the outer end surface of the air suction part 270 is flush with the outer circumferential end surface of the bag clamping wheel 200.

[0078] Specifically, in the embodiment, the air suction part 270 can be arranged as a suction disc, an air suction hole or the like, and when arranged as an air suction hole, the air suction hole can be arranged on the bag clamping part 210 or the bag clamping wheel 200; the air suction part 270 arranged on both sides of the bag clamping part 210 can suck the bag body of the packaging bag, and the bag clamping protrusion 312 and the bag clamping part 210 can clamp the bag body more conveniently, and the success rate of clamping the bag body by the bag clamping protrusion 312 is improved.

[0079] The embodiment of the present application also discloses a bottom opening device of the bag making machine. Figure 1 Figure 6 The bag clamping wheel 200 and the bottom opening mechanism 300 are fixedly arranged on the bottom opening rotating shaft 500, and an auxiliary bottom opening cam 600 is also arranged on the bottom opening rotating shaft 500, and the auxiliary bottom opening cam 600 is located at the middle part of the pair of bottom opening mechanisms 300 on the bottom opening rotating shaft 500; it should be noted that the auxiliary bottom opening cam 600 is fixedly arranged on the bottom opening rotating shaft 500 and rotates with the bottom opening rotating shaft 500.

[0080] The auxiliary bottom opening cam 600 is also provided with air suction parts 270, and a bag blocking rod 610 is arranged on the radial side of the auxiliary bottom opening cam 600, and the bag blocking rod 610 is arranged in parallel with the bottom opening rotating shaft 500 and is fixedly arranged on the bottom opening rotating shaft 500. Figure 6 Similarly, the air suction part 270 on the auxiliary bottom opening cam 600 can also be a suction disc, an air suction hole or the like, and when arranged as an air suction hole, the air suction hole can be arranged on the auxiliary bottom opening cam 600.

[0081] With the structure, the air suction part 270 arranged on the auxiliary bottom opening cam 600 can suck the middle part of the bag body, when the packaging bag has a large width, the bag clamping part 210 and the bag clamping protrusion 312 of the pair of bottom opening mechanisms 300 located on both sides of the bag body in the width direction can clamp the bag bodies on both sides of the packaging bag, and the air suction part 270 can suck the middle part of the bag body, and through the cooperation of the three parts, the part close to the bag bottom of the packaging bag can be reliably clamped or sucked, so that the bottom opening operation is facilitated. In addition, the bag blocking rod 610 cooperates with the auxiliary bottom opening cam 600, can limit and stop the bag body, and effectively prevent the bag body from being deviated or misaligned during the operation.

[0082] ​​In conclusion, the utility model discloses a kind of bottom opening device of bag making machine, be provided with elastic member 220 between bag clamping part 210 and bag clamping wheel 200, when bag clamping protrusion 312 is in clamping state and abuts on the opposite surface of bag clamping part 210, elastic member 220 will be compressed deformation, the rigidity impact when bag clamping protrusion 312 is contacted with bag clamping part 210 is converted into the elastic potential energy of elastic member 220, play the role of buffering, avoid the abrasion caused by bag clamping part 210, can also prevent bag clamping protrusion 312 from being broken, effectively improve the service life of bag clamping part 210 and bag clamping protrusion 312, and still be provided with adjusting member 240 can adjust the initial compression of elastic member 220, and then adjust the size of the elasticity between helical spring and bag clamping part 210.

[0083] It should be noted that in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application is introduced in combination with the preferred embodiments, it does not mean that the features of the present application are limited to this embodiment. On the contrary, the purpose of introducing the present application in combination with the embodiment is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details are included in the above description, and the present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0084] It should be noted that in this specification, similar numbers and letters in the following drawings represent similar items, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0085] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product is used, only for the convenience of describing the present application and simplifying the description, and not to indicate or imply that the indicated device or element must have a particular orientation, constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the present application.

[0086] The terms "first", "second", and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0087] In the description of the present embodiment, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0088] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is a further detailed explanation of the present application in conjunction with the specific embodiments, and the specific implementation of the present application should not be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple deductions or substitutions, without departing from the spirit and scope of the present application.

Claims

1. An opening bottom device of a bag making machine, characterized by, The device comprises a frame, a bag clamping wheel rotatably arranged on the frame, and a pair of bottom opening mechanisms arranged on both sides of the bag clamping wheel. The pair of bottom opening mechanisms are arranged on both sides of the bag body in the width direction of the bag, and each of the bottom opening mechanisms comprises a bag clamping part arranged on the outer periphery of the corresponding side of the bag clamping wheel and a bag clamping assembly arranged on the outer side of the bag clamping wheel and opposite to the bag clamping part. The bag clamping assembly comprises a bag clamping swing arm and a bag clamping protrusion at the free end of the bag clamping swing arm, the bag clamping swing arm can reciprocally swing relative to the bag clamping part to drive the bag clamping protrusion to switch between a clamping state and a separation state relative to the bag clamping part. The bag clamping part is fixed to the outer periphery of the corresponding side of the bag clamping wheel by an elastic member, the elastic member extends along the radial direction of the bag clamping wheel and is fixedly connected at both ends to the bag clamping part and the bag clamping wheel, and when the bag clamping protrusion is in the clamping state, the end of the bag clamping protrusion abuts against the opposite surface of the bag clamping part and the elastic member is compressed. The outer periphery of one side of the bag clamping wheel is provided with a mounting groove, and the bag clamping part is movably arranged in the mounting groove in the radial direction. The elastic member is a spiral spring, one end of the spiral spring is fixed to the bottom wall of the bag clamping part, and the other end is fixed to the bottom wall of the mounting groove.

2. The bottom opening apparatus of a bag making machine according to claim 1, wherein The end of the bag clamping wheel abutting against the spiral spring is further provided with an adjusting member; and The bottom wall of the mounting groove is further provided with an adjusting groove extending along the radial direction of the bag clamping wheel, and the adjusting member is movably fitted in the adjusting groove along the radial direction.

3. The bottom opening device of a bag making machine according to claim 2, wherein The edge of the bag clamping part is clamped and fitted with the edge of the mounting groove, and when the bag clamping protrusion is in the separation state, the outer peripheral wall of the bag clamping part smoothly transitions with the outer peripheral wall of the bag clamping wheel. The side of the bag clamping part close to the bag clamping wheel is further fixedly provided with a guide member, and the bag clamping wheel is provided with a guide groove matched with the guide member; wherein 4. The bottom opening device of a bag making machine according to claim 3, wherein The guide member extends along the radial direction of the bag clamping wheel, and the guide member is movable in the guide groove.

5. The bottom opening apparatus of a bag making machine as claimed in claim 2, wherein 6. The bottom opening device of the bag making machine according to any one of claims 1-5, wherein: The outer side of the axial direction of the bag clamping wheel further has a rotating shaft mounting part, the rotating shaft mounting part synchronously rotates with the bag clamping wheel; Each of the bag clamping assemblies further comprises a bag clamping rotating shaft, the bag clamping rotating shaft is rotatably arranged in the rotating shaft mounting part, one end of the bag clamping swing arm is fixedly arranged on the bag clamping rotating shaft and extends along the same direction as the radial direction of the bag clamping wheel, and the bag clamping protrusion is fixedly arranged on the other end of the bag clamping swing arm away from the bag clamping rotating shaft and extends towards the bag clamping wheel; The rotating shaft of the bag clamping rotating shaft is perpendicular to the axial direction of the bag clamping wheel. A return coil spring is sleeved on the bag clamping rotating shaft, one end of the return coil spring is fixed to the rotating shaft mounting part, and the other end is fixed to the bag clamping swing arm; and ​ ​ 7. The bottom opening device of a bag making machine according to claim 6, wherein ​ The rotation shaft mounting part is also provided with a guide ring groove which is open to the bag clamping assembly and is arranged on the frame, and a contact part is arranged on the circumferential side wall of the guide ring groove and protrudes radially into the guide ring groove; The bag clamping swing arm is also provided with a cam shaft which protrudes into the guide ring groove at the end away from the bag clamping protrusion, and a contact roller is rotatably arranged at the end of the cam shaft and is rotatable in the guide ring groove and movable along the guide ring groove with the rotation of the bag clamping wheel; wherein When the contact roller moves to the contact part in the guide ring groove and is pressed by the contact part, the bag clamping swing arm swings around the bag clamping rotation shaft so that the bag clamping protrusion is in the separated state relative to the bag clamping part; when the contact roller moves away from the contact part in the guide ring groove, the bag clamping swing arm swings around the bag clamping rotation shaft under the action of the return coil spring so that the bag clamping protrusion is in the clamped state relative to the bag clamping part.

8. The bottom opening device of a bag making machine according to claim 7, wherein The contact part is arranged as a contact protrusion which is detachably arranged on the inner wall of the guide ring groove and smoothly transitions with the contact part of the inner wall of the guide ring groove.

9. The bottom opening apparatus of a bag making machine according to any one of claims 1 to 5, characterized in that, The bag clamping part extends along the outer circumferential end surface of the bag clamping wheel, and air suction components are also arranged on both sides of the bag clamping part, and the outer end surface of the air suction component is flush with the outer circumferential end surface of the bag clamping wheel.

10. The bottom opening apparatus of a bag making machine according to any one of claims 1 to 5, characterized in that, The bag clamping wheel and the bottom opening mechanism are fixedly arranged on a bottom opening rotation shaft, and an auxiliary bottom opening cam is also arranged on the bottom opening rotation shaft and is located at the middle part of the pair of bottom opening mechanisms; wherein The auxiliary bottom opening cam is also provided with air suction components, and a bag blocking rod is also arranged on the radial side of the auxiliary bottom opening cam, and the bag blocking rod is arranged in parallel relative to the bottom opening rotation shaft and is fixedly arranged on the bottom opening rotation shaft.

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