A parent-child cup sealing device

Abstract

The present invention discloses a sealing device for a mother-and-child cup, which comprises a frame, a first lifting component, a hot sealing head and a first supporting component. The first supporting component includes a plurality of main supporting plates for supporting the flanges of the mouth parts of the mother-and-child cups. A conveying channel is formed between two adjacent main supporting plates. The mother-and-child cup includes a first cavity and a second cavity, and the first cavity and the second cavity are respectively located in two adjacent conveying channels. The first lifting component is installed on the frame and drives the hot sealing head to move vertically back and forth. The device further includes a second lifting component and a second supporting component. The second lifting component includes a second driving component and a loading plate located below the main supporting plate. The second driving component drives the loading plate to move vertically back and forth. The second supporting component includes a cup mouth supporting member installed on the loading plate. The top surface of the cup mouth supporting member forms an annular supporting surface corresponding to the flange of the mouth part of the second cavity. When the second driving component drives the loading plate to move to the high position, the annular supporting surface supports the flange of the mouth part of the second cavity.

Description

[Technical field]

[0001] The invention relates to the technical field of mother-and-child cup production, and in particular to a mother-and-child cup sealing device. [Background technology]

[0002] Among the existing cup-linked products, the production process of the mother-and-child cup-shaped products is relatively special. Cup-linked products are generally formed by thermoplastic molding multiple cup body structures with cavities on a sheet, and then milk products or other materials are poured into the cavities, and then sealed with a membrane, and finally cut to form a cup-linked product that meets the minimum sales unit requirements, just like the common 2*4 cup yogurt. This type of cup-linked product has one cavity, which is the same as the number of cavities in a single cup. The mother-and-child cup-shaped cup-linked products are different from the aforementioned single-cavity cup-linked products. Any mother-and-child cup product has two cavities on the cup body. Its production process is to heat the sheet to form multiple cup body structures with double cavities, and then pour materials into one of the cavities, and cover the cup mouths of the two cavities with a membrane, and then perform the first sealing to seal the cup mouth containing the material, while the membrane of the other cavity only covers the cup mouth, so that the cavity containing the material is closed, and the other cavity is only blocked by the membrane at the cup mouth. After that, the independent cup body is obtained by pressing and cutting, and then the film at the part that does not seal the cup mouth is opened, and grains or nuts are poured into the cavity; then the film is coated and the second sealing is performed. It can be seen that when the mother-child cup is sealed for the second time, the cup body is already in an independent state, not a joint cup state.

[0003] When the first sealing operation is performed when the cup body is connected as one (i.e. in the linked cup state), the bottom of the sheet is continuously supported, which ensures that the membrane and the cup mouth can be tightly squeezed during sealing. During the second sealing operation of the mother-and-child cup, affected by the independent cup body structure, the cup body can receive effective support at most three locations, including the two sides of the cup mouth of the cup body and the middle of the cup body, i.e. the area between the two cavities. Most of the edge of the cup mouth of the cup body is in an unsupported state during sealing. When the heat sealing head presses the cover film, the parts tightly connected between the cover film and the cup mouth of the cup body are limited to the three aforementioned supported locations. Therefore, during the second sealing operation of the mother-and-child cup, the contact between the cup mouth of the cup body and the cover film is not tight enough, and cannot provide sufficient sealing effect, resulting in material leakage. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a mother-and-child cup sealing device, which can fully support the mouth flange of the second cavity during the second sealing operation, thereby improving the sealing effect and avoiding material leakage.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A mother - and - son cup sealing device, comprising a frame, a first lifting member, a heat - sealing head and a first supporting member. The first supporting member includes a plurality of main support plates arranged in parallel at intervals and supporting the flanges of the mouth parts of the mother - and - son cups. A conveying channel is formed between two adjacent main support plates. The mother - and - son cup includes a first cavity that has been sealed and a second cavity that is covered with a film and to be sealed. The first cavity and the second cavity are respectively located in two adjacent conveying channels. The first lifting member is installed on the frame and drives the heat - sealing head to move vertically back and forth. It further includes a second lifting member and a second supporting member. The second lifting member includes a second driving member and a load - bearing plate located below the main support plate. The second driving member drives the load - bearing plate to move vertically back and forth. The second supporting member includes a cup - mouth supporting member installed on the load - bearing plate. The top surface of the cup - mouth supporting member forms an annular supporting surface corresponding to the flange of the mouth part of the second cavity. When the second driving member drives the load - bearing plate to move to the high position, the annular supporting surface supports the flange of the mouth part of the second cavity.

[0007] Further, the second supporting member further includes a cup - bottom supporting member. The cup - bottom supporting member and the cup - mouth supporting member are located on both sides of the main support plate. When the second driving member drives the load - bearing plate to move to the high position, the cup - bottom supporting member supports the bottom of the first cavity.

[0008] Furthermore, the first supporting member further includes a secondary support plate connected to the main support plate. The cup - mouth supporting member is sleeved outside the secondary support plate. The secondary support plate supports the bottom of the second cavity.

[0009] Furthermore, two first connecting plates are connected to the main support plate, arranged at intervals and extending vertically. A second connecting plate extending along the conveying direction is connected between the two first connecting plates. The second connecting plate is located below the cup - mouth supporting member. The secondary support plate is connected to the second connecting plate.

[0010] Furthermore, a bracket is installed on the top surface of the load - bearing plate. A guiding hole is provided on the bracket. The second connecting plate passes through the guiding hole. The cup - mouth supporting member and the cup - bottom supporting member are installed on the top of the bracket.

[0011] Further, the second driving member includes a second motor, a transmission rod, a swing arm and a pull rod. The transmission rod is horizontally arranged on the top of the frame. The second motor drives the transmission rod to rotate. One end of the swing arm rotates synchronously with the transmission rod, and the other end is hinged to the top end of the pull rod. The bottom end of the pull rod is hinged to the load - bearing plate.

[0012] Further, the frame includes a bottom plate, a top plate, and connecting rods connected between the bottom plate and the top plate, and the carrier plate is slidably sleeved on the connecting rods.

[0013] Furthermore, the first lifting member includes a linear cylinder, the linear cylinder includes a cylinder body and a telescopic rod, the cylinder body is installed on the top plate, and the lower end of the telescopic rod is connected to the heat sealing head.

[0014] Advantages of the present invention:

[0015] 1. After the mother and child cups are conveyed to the sealing device, the second driving member drives the carrier plate to move upward, so that the annular supporting surface of the cup mouth support member moves to a high position and supports the flanging of the mouth of the second cavity. Since the size of the annular supporting surface matches the size of the flanging of the mouth of the second cavity, the flanging of the mouth of the second cavity can be fully supported. In this way, when the first lifting member then drives the heat sealing head to descend to a low position and the heat sealing head presses the cover film, the mouth of the second cavity can be sealed 360°, thereby improving the sealing effect of the seal and preventing material leakage.

[0016] 2. The second supporting member further includes a cup bottom support member. The cup bottom support member and the cup mouth support member are located on both sides of the main support plate. When the second driving member drives the carrier plate to move to a high position, the cup bottom support member supports the bottom of the first cavity. By providing the cup bottom support member, the cup bottom support member can support the bottom of the first cavity upward at a high position, so that the flanging of the mouth of the second cavity remains flat, thereby improving the sealing effect on the mouth of the second cavity.

[0017] 3. The main support plate is connected with two first connecting plates arranged at intervals and extending vertically. A second connecting plate extending along the conveying direction is connected between the two first connecting plates. The second connecting plate is located below the cup mouth support member, and the auxiliary support plate is connected to the second connecting plate. With such a design, it is only necessary to design the cup mouth support member into a sleeve shape that penetrates up and down, and make the auxiliary support plate penetrate upward through the cup mouth support member, thereby simplifying the structure of the cup mouth support member and reducing the processing difficulty of the cup mouth support member.

[0018] 4. A bracket is installed on the top surface of the carrier plate, and a guiding hole is provided on the bracket. The second connecting plate penetrates through the guiding hole, and the cup mouth support member and the cup bottom support member are installed on the top of the bracket. With such a design, the cup mouth support member can be stably supported by the bracket, and at the same time, the interference of the second connecting plate with the lifting movement of the carrier plate can be avoided through the cooperation between the second connecting plate and the guiding hole. At the same time, it also plays a guiding role in the lifting of the carrier plate, preventing skew and being unable to fully support the flanging of the mouth of the second cavity.

[0019] 5. The second driving component includes a second motor, a transmission rod, a swing arm, and a pull rod. The transmission rod is horizontally arranged at the top of the frame. The second motor drives the transmission rod to rotate. One end of the swing arm rotates synchronously with the transmission rod, and the other end is hinged to the top end of the pull rod. The bottom end of the pull rod is hinged to the load plate. With such a design, when the second motor drives the transmission rod to rotate, the transmission rod can drive the swing arm to rotate synchronously, so that the other end of the swing arm makes a lifting motion, thereby realizing the lifting motion of the load plate by pulling the pull rod.

[0020] 6. The frame includes a bottom plate, a top plate, and a connecting rod connected between the bottom plate and the top plate. The load plate is slidably sleeved on the connecting rod. With such a design, the connecting rod can further guide the up and down sliding of the load plate, preventing the cup mouth support from tilting when it is in the high position, thereby ensuring the full support of the cup mouth support for the mouth flanging of the second cavity.

[0021] 7. The first lifting component includes a linear cylinder. The linear cylinder includes a cylinder body and a telescopic rod. The cylinder body is installed on the top plate, and the lower end of the telescopic rod is connected to the heat sealer. With such a design, the structure is simple and the manufacturing cost is relatively low.

[0022] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Description of the Drawings

[0023] The following further describes the present invention with reference to the drawings:

[0024] Figure 1 Schematic perspective view of the mother - daughter cup sealing device in the preferred embodiment of the present invention Figure 1 ;

[0025] Figure 2 Schematic perspective view of the mother - daughter cup sealing device in the preferred embodiment of the present invention Figure 2 ;

[0026] Figure 3 Schematic view of the structure of the second support component in the low position in the preferred embodiment of the present invention Figure 1 ;

[0027] Figure 4 Schematic view of the structure of the second support component in the low position in the preferred embodiment of the present invention Figure 2 ;

[0028] Figure 5 Schematic diagram of the structure of the second support component in the high position supporting the second cavity in the preferred embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the structure of the heat sealer pressing the upper cover film of the second cavity for heat sealing in the preferred embodiment of the present invention. Description of the drawings:

[0031] 01. First cavity; 02. Second cavity; 100. Frame; 110. Bottom plate; 120. Top plate; 121. Mounting seat; 130. Connecting rod; 200. First lifting component; 300. Heat sealing head; 400. First supporting component; 410. Main supporting plate; 411. First connecting plate; 412. Second connecting plate; 420. Second supporting plate; 500. Second lifting component; 510. Second driving component; 511. Second motor; 512. Transmission rod; 513. Swing arm; 514. Pull rod; 520. Loading plate; 521. Sliding hole; 522. Bracket; 523. Guide hole; 600. Second supporting component; 610. Cup mouth support; 611. Annular supporting surface; 620. Cup bottom support. [Specific implementation method]

[0032] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0033] Reference Figures 1 to 6 As shown, the mother-and-child cup in this embodiment has a first cavity 01 and a second cavity 02, and the first cavity 01 and the second cavity 02 are filled with different materials respectively. The mouths of the first cavity 01 and the second cavity 02 are provided with flanges. During processing, the material is first filled into the first cavity 01, and a film is added to cover the mouths of the first cavity 01 and the second cavity 02. Then, the first sealing is performed to weld the film to the flange of the mouth of the first cavity 01 to seal the first cavity 01. At this time, the first cavity 01 is in a sealed state, and the film of the second cavity 02 only covers the mouth of the second cavity 02. Thereafter, an independent cup body is obtained by pressing and cutting, and then the film covering the mouth of the second cavity 02 is opened, and grains or nuts are poured into the second cavity 02, and then coated. At this time, the mouth of the second cavity 02 is in a sealed state with a film coating, and a second sealing is performed when the mother-and-child cup is transported to the workstation of the sealing device.

[0034] Among them, the sealing device for the second sealing in this embodiment includes a frame 100, a first lifting member 200, a hot head 300, a first supporting member 400, a second lifting member 500, and a second supporting member 600. The frame 100 includes a bottom plate 110, a top plate 120, and vertically arranged connecting rods 130. The connecting rods 130 are connected between the bottom plate 110 and the top plate 120, and the four connecting rods 130 are distributed in a rectangle. The first supporting member 400 includes a main supporting plate 410. A plurality of main supporting plates 410 are arranged in parallel at intervals and extend straight along the conveying direction. The main supporting plate 410 can be fixed on the frame 100 or on a supporting seat independently arranged from the frame 100. A conveying channel is formed between two adjacent main supporting plates 410. The first cavity 01 and the second cavity 02 are respectively located in two adjacent conveying channels. The main supporting plate 410 supports the flanging of the mouth of the mother and son cups. The mother and son cups can be fed into the conveying channel along the conveying channel by a step conveying device. The specific structure of the step conveying device can refer to the disclosure in the patent number CN112591215A, which will not be elaborated here.

[0035] The first lifting member 200 includes a linear cylinder. The linear cylinder includes a cylinder body and a telescopic rod. The cylinder body is installed on the top plate 120, and the lower end of the telescopic rod is fixedly connected to the hot head 300. By driving the telescopic rod to move relative to the cylinder body, the vertical reciprocating movement of the hot head 300 can be realized. In this way, when the second sealing is carried out, the telescopic rod drives the hot head 300 to move vertically downward so that the hot head 300 presses on the diaphragm covering the mouth of the second cavity 02 to complete the sealing. After the sealing is completed, the telescopic rod drives the hot head 300 to move vertically upward to reset. And such a design can make the structure of the first lifting member 200 simpler and the manufacturing cost lower.

[0036] The second lifting member 500 includes a second driving member 510 and a loading plate 520. The loading plate 520 is located below the main support plate 410. The second driving member 510 includes a second motor 511, a transmission rod 512, a swing arm 513, and a pull rod 514. Two spaced mounting seats 121 are provided on the top surface of the top plate 120. The transmission rod 512 is horizontally arranged, and both ends of the transmission rod 512 are rotatably mounted on the two mounting seats 121. The second motor 511 drives the transmission rod 512 to rotate. One end of the swing arm 513 is sleeved on the transmission rod 512 and rotates synchronously with the transmission rod 512. The other end of the swing arm 513 is hinged to the top end of the pull rod 514. The loading plate 520 is provided with four sliding holes 521, and the sliding holes 521 are slidably engaged with the connecting rod 130 so that the loading plate 520 can slide up and down relative to the connecting rod 130. A fixed shaft is provided at the bottom of the loading plate 520. The bottom end of the pull rod 514 passes through the loading plate 520 downward and is sleeved on the fixed shaft, thereby realizing the hinge connection between the bottom end of the pull rod 514 and the loading plate 520. In this way, when the second motor 511 drives the transmission rod 512 to rotate, the transmission rod 512 can drive the swing arm 513 to rotate synchronously, and then the other end of the swing arm 513 makes a lifting motion, thereby realizing the lifting motion of the loading plate 520 by pulling the pull rod 514.

[0037] The second support member 600 includes a cup mouth support member 610 and a cup bottom support member 620 which are respectively fixed on the top of the loading plate 520. The cup mouth support member 610 and the cup bottom support member 620 are respectively located on both sides of the main support plate 410, so that the cup mouth support member 610 corresponds to the conveying channel of the second cavity 02, and the cup bottom support member 620 corresponds to the conveying channel of the first cavity 01. The top surface of the cup mouth support member 610 forms an annular support surface 611 corresponding to the flanging of the mouth of the second cavity 02, that is, the shape and size of the annular support surface 611 are equal to those of the flanging of the mouth of the second cavity 02. In this way, when the second driving member 510 drives the loading plate 520 to move to the high position, the annular support surface 611 can support the flanging of the mouth of the second cavity 02. Therefore, the flanging of the mouth of the second cavity 02 can be fully supported. In this way, when the first lifting member 200 then drives the hot sealing head 300 to descend to the low position and the hot sealing head 300 presses the cover film, the mouth of the second cavity 02 can be sealed 360°, thereby improving the sealing effect of the seal and avoiding material leakage. In addition, the connecting rod 130 can further play a guiding role in the up and down sliding of the loading plate 520, avoiding the inclination of the cup mouth support member 610 when it is in the high position, thereby ensuring the full supporting effect of the cup mouth support member 610 on the flanging of the mouth of the second cavity 02.

[0038] In addition, when the second driving member 510 drives the carrier plate 520 to move to the high position, the bottom support member 620 of the cup can also support the bottom of the first cavity 01 upward at the same time. This design is because after the cup mouth support member 610 supports the entire mother-daughter cup upward, the first cavity 01 will be suspended, which causes the first cavity 01 to drop under its own weight, and then the flanging at the mouth of the second cavity 02 will slightly arch upward. By supporting the bottom of the first cavity 01 upward by the bottom support member 620 at the high position, the drop of the first cavity 01 can be eliminated, so that the flanging at the mouth of the second cavity 02 can be kept flat, and thus the sealing effect on the mouth of the second cavity 02 can be improved.

[0039] Finally, the first support member 400 in this embodiment further includes a plurality of auxiliary support plates 420 extending vertically. The auxiliary support plates 420 are connected to the main support plate 410 and are located in the conveying channel for conveying the second cavity 02 to support the bottom of the second cavity 02. Specifically, two vertically extending first connecting plates 411 are connected to the main support plate 410. The two first connecting plates 411 are spaced apart in the conveying direction. A second connecting plate 412 extending along the conveying direction is connected between the two first connecting plates 411. The second connecting plate 412 is located below the cup mouth support member 610. The auxiliary support plates 420 are connected to the second connecting plate 412. A bracket 522 is installed on the top surface of the carrier plate 520. Both the cup mouth support member 610 and the bottom support member 620 of the cup are installed on the top of the bracket 522. A guiding hole 523 is provided on the bracket 522. The second connecting plate 412 penetrates through the guiding hole 523 along the conveying direction. The guiding hole 523 is in sliding fit with the second connecting plate 412 in the vertical direction, so that the bracket 522 can move vertically back and forth relative to the second connecting plate 412. At this time, the cup mouth support member 610 only needs to be set as a sleeve-like structure that is through up and down. Part of the side wall of the cup mouth support member 610 is fixedly connected to the bracket 522. The cup mouth support member 610 is sleeved outside the auxiliary support plate 420. In this way, the structure of the cup mouth support member 610 can be simplified, and the processing difficulty of the cup mouth support member 610 can be reduced. Since the spatial position of the first support member 400 remains unchanged, in this way, when the second support member 600 moves up and down, the interference of the second connecting plate 412 with the lifting movement of the bracket 522 can be avoided, and at the same time, it also plays a guiding role in the lifting of the bracket 522, avoiding the cup mouth support member 610 from being skewed and unable to fully support the flanging at the mouth of the second cavity 02.

[0040] It can be understood that in other embodiments of the present invention, the first lifting member includes a first motor and a worm and worm gear structure. The output shaft of the first motor is connected to the worm wheel, and the bottom end of the worm is connected to the hot sealing head. By driving the worm wheel to rotate by the output shaft of the first motor, the reciprocating movement of the worm in the vertical direction can be realized.

[0041] It can be understood that in other embodiments of the present invention, the second motor and the transmission rod are both installed on the bottom plate. The transmission rod is horizontally arranged and rotatably installed on the bottom plate. One end of the swing arm is sleeved on the transmission rod and rotates synchronously with the transmission rod, and the other end is hinged to the lower end of the pull rod. The upper end of the pull rod is hinged to the load-carrying plate. With such a design, the load-carrying plate can also be driven to move vertically back and forth by the second driving component.

[0042] It can be understood that in other embodiments of the present invention, the second driving component includes a hydraulic cylinder. The hydraulic cylinder includes a cylinder body and a piston that can telescopically move relative to the cylinder body. The piston is connected to the load-carrying plate. With such a design, the second driving component can also drive the load-carrying plate to move vertically back and forth.

[0043] It can be understood that in other embodiments of the present invention, the cup mouth support is directly fixed on the load-carrying plate. At this time, a jack is provided on the side wall of the cup mouth support, and the auxiliary support plate is directly connected to the main support plate through a horizontal connecting plate. The horizontal connecting plate penetrates through the jack and is slidably matched with the jack. With such a design, the cup mouth support can also slide vertically relative to the auxiliary support plate.

[0044] It can be understood that in other embodiments of the present invention, in order to reduce the manufacturing cost, the auxiliary support plate and / or the cup bottom support can also be omitted.

[0045] As described above, the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A mother-child cup sealing device, comprising a frame (100), a first lifting member (200), a hot sealing head (300) and a first supporting member (400). The first supporting member (400) includes a plurality of main supporting plates (410) that are arranged in parallel at intervals and support the flanging of the mouth parts of the mother-child cups. A conveying channel is formed between two adjacent main supporting plates (410). The mother-child cup includes a first cavity (01) that has been sealed and a second cavity (02) that is covered with a film and to be sealed. The first cavity (01) and the second cavity (02) are respectively located in two adjacent conveying channels. The first lifting member (200) is installed on the frame (100) and drives the hot sealing head (300) to move vertically back and forth. Characterized in that, it further includes a second lifting member (500) and a second supporting member (600). The second lifting member (500) includes a second driving member (510) and a load-carrying plate (520) located below the main supporting plate (410). The second driving member (510) drives the load-carrying plate (520) to move vertically back and forth. The second supporting member (600) includes a cup mouth supporting member (610) installed on the load-carrying plate (520). The top surface of the cup mouth supporting member (610) forms an annular supporting surface (611) corresponding to the flanging of the mouth part of the second cavity (02). When the second driving member (510) drives the load-carrying plate (520) to move to the high position, the annular supporting surface (611) supports the flanging of the mouth part of the second cavity (02). The second supporting member (600) further includes a cup bottom supporting member (620). The cup bottom supporting member (620) and the cup mouth supporting member (610) are located on both sides of the main supporting plate (410). When the second driving member (510) drives the load-carrying plate (520) to move to the high position, the cup bottom supporting member (620) supports the bottom of the first cavity (01). The first supporting member (400) further includes a secondary supporting plate (420) connected to the main supporting plate (410). The cup mouth supporting member (610) is sleeved outside the secondary supporting plate (420). The secondary supporting plate (420) supports the bottom of the second cavity (02).

2. A mother-child cup sealing device according to claim 1, Characterized in that, two first connecting plates (411) that are spaced apart and extend vertically are connected to the main supporting plate (410). A second connecting plate (412) that extends along the conveying direction is connected between the two first connecting plates (411). The second connecting plate (412) is located below the cup mouth supporting member (610). The secondary supporting plate (420) is connected to the second connecting plate (412).

3. A mother-child cup sealing device according to claim 2, Characterized in that, A bracket (522) is mounted on the top surface of the load-carrying plate (520). A guiding hole (523) is provided on the bracket (522). The second connecting plate (412) passes through the guiding hole (523). The cup mouth support member (610) and the cup bottom support member (620) are mounted on the top of the bracket (522).

4. A mother-child cup sealing device according to any one of claims 1 to 3, characterized in that, the second driving member (510) includes a second motor (511), a transmission rod (512), a swing arm (513) and a pull rod (514). The transmission rod (512) is horizontally arranged on the top of the frame (100). The second motor (511) drives the transmission rod (512) to rotate. One end of the swing arm (513) rotates synchronously with the transmission rod (512), and the other end is hinged to the top end of the pull rod (514). The bottom end of the pull rod (514) is hinged to the load-carrying plate (520).

5. A mother-child cup sealing device according to any one of claims 1 to 3, characterized in that, the frame (100) includes a bottom plate (110), a top plate (120), and a connecting rod (130) connected between the bottom plate (110) and the top plate (120). The load-carrying plate (520) is slidably sleeved on the connecting rod (130).

6. A mother-child cup sealing device according to claim 5, characterized in that, the first lifting member (200) includes a linear cylinder. The linear cylinder includes a cylinder body and a telescopic rod. The cylinder body is mounted on the top plate (120), and the lower end of the telescopic rod is connected to the heat sealing head (300).

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