Pressing and sealing assembly for external-pumping type vacuum packaging machine and external-pumping type vacuum packaging machine comprising pressing and sealing assembly

Abstract

The utility model relates to a pressing and sealing assembly for an external pumping type vacuum packaging machine and the external pumping type vacuum packaging machine comprising the pressing and sealing assembly, and belongs to the technical field of packaging machinery. The compression sealing assembly comprises a compression sealing head connecting piece, a compression sealing head and a sealing ring, the compression sealing head connecting piece and the compression sealing head are connected in a sealed mode through the sealing ring, the compression sealing head connecting piece and the compression sealing head are each provided with an exhaust pipe channel in a penetrating mode, and the compression sealing head comprises a front portion and a rear portion which are integrally formed. The boundary of the front part and the rear part is provided with a chamfer, and the outline of the cross section of the front part is defined by two large arcs and four small arcs tangent to the large arcs respectively. By means of the pressing and sealing assembly, the problem that the vacuum effect is not ideal due to untight sealing can be solved, the distance of the air suction pipe extending into the packaging bag can be adjusted, and air in the packaging bag can be better sucked out. The pressing and sealing assembly is simple in structure, easy to machine and manufacture and suitable for large-scale industrial production.

Description

Technical Field

[0001] The utility model belongs to the technical field of packaging machinery, and in particular relates to a compression sealing component for an external vacuum packaging machine and the external vacuum packaging machine comprising the component. Background Art

[0002] The vacuum packaging machine can automatically extract the air in the packaging bag, and complete the sealing process after reaching a predetermined vacuum degree. Among them, the external vacuum packaging machine is to put the vacuum nozzle into the packaging bag of the packaged object, evacuate the air, withdraw the vacuum nozzle, and then complete the sealing. Specifically, the sealing machine provided in the existing external vacuum packaging machine includes two horizontally arranged clamps, and a vacuum nozzle is provided between the two clamps. When in use, the opening of the packaging bag is passed through the two clamps, and the air nozzle is extended into the packaging bag. The two clamps are close to each other to clamp the packaging bag and the air nozzle at the same time. Then the vacuum device is started. After the packaging bag is evacuated to a vacuum, the vacuum device is moved to remove the air nozzle from the packaging bag. At this time, the two clamps still maintain the state of clamping the packaging bag, and the clamps are heated by the sealing machine to achieve heat sealing of the packaging bag. However, in this process, there is still the problem of unsatisfactory vacuuming effect due to loose sealing, and the emergence of this problem mainly includes two aspects: on the one hand, the current vacuum nozzle is generally in the shape of a round tube or a flat shape. When the two parallel clamps in the sealing machine clamp the suction nozzle with the above shape, due to the inherent shape of the suction nozzle, the normal pressure of the suction nozzle is different at different places, so the place with relatively small normal pressure will have the problem of loose sealing; on the other hand, when the nozzle is pulled out of the packaging bag, the external air can easily enter the vacuumed packaging bag through the gap between the two clamps opened by the nozzle. Although the two clamps will quickly recover and block the gap, it will still affect the vacuum effect of the packaging bag, resulting in loose sealing. Therefore, in order to improve the vacuuming effect of the external vacuum machine, the above problems need to be improved. Utility Model Content

[0003] In view of this, one of the purposes of the present invention is to provide a compression sealing assembly for an external vacuum packaging machine; the second purpose is to provide an external vacuum packaging machine including the compression sealing assembly.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] 1. A compression sealing assembly for an external vacuum packaging machine, the compression sealing assembly comprising a compression sealing head connector, a compression sealing head and a sealing ring; the compression sealing head connector is sealed and connected to the compression sealing head through a sealing ring; the compression sealing head connector and the compression sealing head are both provided with an exhaust pipe channel; the compression sealing head comprises an integrally formed front part and a rear part, the boundary between the front part and the rear part is chamfered, and the cross-sectional profile of the front part is surrounded by two large arcs and four small arcs tangent to the large arcs respectively.

[0006] Preferably, the radii of the two large arcs are both 7.5-30 mm, the central angles of the two arcs are both 30°-180°, and the radii of the four small arcs are both 1.2-10 mm.

[0007] Preferably, the chamfer 8 has a degree of 30°-40°.

[0008] Preferably, the sealing ring 4 is an O-ring.

[0009] Preferably, the end surface of the rear portion away from the boundary is provided with threaded holes, and sealing ring installation grooves are provided between the threaded holes.

[0010] Preferably, in a direction away from the clamping sealing head, the clamping sealing head connector is sequentially provided with a through hole, a bolt installation avoidance groove, a weight-reducing hole and a limit hole for use with the threaded hole.

[0011] Preferably, the front end of the exhaust pipe is a hollow cone, and a portion adjacent to the hollow cone is provided with lateral openings distributed along the circumference.

[0012] 2. An external vacuum packaging machine containing the compression and sealing assembly comprises a workbench, on which a frame, a sealing mechanism, a compression and sealing mechanism, an exhaust pipe telescopic mechanism and a control box are fixed; a packaging bag support platform and a cylinder mounting plate are fixed on the frame; the compression and sealing mechanism comprises a first cylinder arranged on the cylinder mounting plate, a first cylinder connecting assembly connected to the first cylinder, an upper silicone block connected to the first cylinder connecting assembly, a lower silicone block used in conjunction with the upper silicone block, a block mounting seat for mounting the lower silicone block, a compression and sealing assembly arranged between the upper silicone block and the lower silicone block, a compression and sealing assembly limit pin, and a limit pin mounting seat for mounting the limit pin of the compression and sealing assembly.

[0013] Preferably, the sealing mechanism includes a second cylinder arranged on the cylinder mounting plate, a second cylinder connecting assembly connected to the second cylinder, and a heat sealer cooperating with the second cylinder connecting assembly.

[0014] Preferably, the exhaust pipe telescopic mechanism includes an exhaust pipe, an exhaust pipe limiting member, and an exhaust pipe mounting seat supporting the exhaust pipe and the exhaust pipe limiting member.

[0015] The beneficial effects of the utility model are: providing a compression sealing component for an external vacuum packaging machine and an external vacuum packaging machine including the component, using the compression sealing component can not only solve the problem of unsatisfactory vacuum effect due to loose sealing, but also adjust the distance that the vacuum tube extends into the packaging bag, so as to better realize the extraction of air in the packaging bag. The key to achieving the above effect lies in the following two points: First, the cross-sectional profile of the front part of the compression sealing head in the compression sealing component is surrounded by two large arcs and four small arcs tangent to the large arcs. Compared with the traditional circular tube or flat shape, such an external profile can ensure that the compression sealing head is subjected to the maximum normal pressure at all places, thereby ensuring a highly tight seal, as shown in the following example. Fig. 9 As shown, Fig. 9 The middle left picture shows the pressure conditions when the traditional tubular vacuum nozzle is sealed. The silicone sealing strip moves in the direction of pressure F, and the three points ABC of the silicone sealing strip will coincide with the three points abc of the vacuum nozzle respectively. Point a is subjected to a normal pressure equal to the pressure F, point b is subjected to a normal pressure equal to the component of pressure F along the normal direction of point b, and the same is true for point c. According to the force analysis, the normal pressure gradually decreases from a to b and then to c, which will result in the sealing effect being worse the closer to point c. Fig. 9The middle right figure shows the pressure conditions of the compression sealing head when sealing in the utility model. The silicone sealing strip moves in the direction of pressure F, and the three points A', B', and C' of the silicone sealing strip will coincide with the three points a', b', and c' of the compression sealing head respectively. The normal pressure on point a' is the same as the pressure F, the normal pressure on point b' is equal to the component of the pressure F along the normal direction of point b', and the same is true for point c'. Although the normal pressure gradually decreases from a' to b' and then to c', the normal pressure at both ends of the compression sealing head is arc-shaped, so the normal pressure at c' will be greater than the normal pressure at c of the traditional tubular suction nozzle, thereby ensuring the sealing here. In addition, the two ends of the upper and lower silicone blocks used in conjunction with the compression sealing head in the utility model (E' and D' in the right figure) are also designed to be arcs. Compared with the two ends of the traditional upper and lower silicone blocks (E and D in the right figure) designed to be sharp angles, the arc design effectively solves the problem of insufficient sealing caused by deformation of the silicone blocks due to stress concentration at this location. Second, when vacuuming, the exhaust pipe passes through the compression sealing head through the exhaust pipe channel and enters the packaging bag. When the vacuuming is completed, the exhaust pipe returns to the compression sealing head. Since the compression sealing head connector is sealed to the compression sealing head by a sealing ring, the exhaust pipe does not exit the sealing ring when it returns to the compression sealing head, thereby effectively avoiding the problem of loose sealing caused by external air in the packaging bag during the process of the air nozzle being pulled out of the packaging bag. The compression sealing component has a simple structure and is easy to process and manufacture, and is suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an assembly effect diagram of the compression sealing component in the utility model;

[0017] Figure 2 It is a cross-sectional view of the front view and the left view of the compression seal assembly in the utility model;

[0018] Figure 3 This is a cross-sectional view of the front part of the compression sealing head in the utility model;

[0019] Figure 4 This is the overall assembly diagram of the internal and external vacuum packaging machine of the utility model;

[0020] Figure 5 This is a schematic diagram of the use of the compression sealing head and the upper and lower silicone pressure blocks in the utility model;

[0021] Figure 6 This is the assembly diagram of the sealing mechanism of the internal and external vacuum packaging machine of the utility model;

[0022] Figure 7 This is the assembly diagram of the compression and sealing mechanism of the internal and external vacuum packaging machine of the utility model;

[0023] Figure 8This is the assembly diagram of the telescopic mechanism of the air extraction pipe in the internal and external extraction vacuum packaging machine of the utility model;

[0024] Fig. 9 It is an analysis diagram of the force conditions of the traditional circular tubular exhaust nozzle and the compression sealing head of the utility model when they are compressed and sealed.

[0025] In the figure, 1, compression seal assembly; 2, compression seal head connector; 3, compression seal head; 4, sealing ring; 5, exhaust pipe channel; 6, front; 7, rear; 8, chamfer; 9, threaded hole; 10, seal ring installation groove; 11, through hole; 12, bolt installation avoidance groove; 13, weight reduction hole; 14, limit hole; 15, workbench; 16, rack; 17, sealing mechanism; 18, compression seal mechanism; 19, exhaust pipe telescopic mechanism; 20, control box; 2 1. Packaging bag support platform; 22. Cylinder mounting plate; 23. First cylinder; 24. First cylinder connecting assembly; 25. Upper silicone pressure block; 26. Lower silicone pressure block; 27. Pressure block mounting seat; 28. Limit pin of compression sealing assembly; 29. ​​Limit pin mounting seat; 30. Second cylinder; 31. Second cylinder connecting assembly; 32. Heat sealing machine; 33. Exhaust pipe; 34. Exhaust pipe limiter; 35. Exhaust pipe mounting seat; 36. Hollow cone; 37. Lateral opening. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present utility model will be described in detail below.

[0027] The following is combined with Figure 1-8 This application is described in further detail.

[0028] Example 1

[0029] A compression sealing assembly for an external vacuum packaging machine. Figure 1-3 The compression seal assembly 1 includes a compression seal head connector 2, a compression seal head 3 and an O-ring 4, wherein the compression seal head 3 includes an integrally formed front portion 6 and a rear portion 7, the boundary between the front portion 6 and the rear portion 7 has a chamfer 8 of 35°, the cross-sectional profile of the front portion 6 is surrounded by two large arcs with a radius of 15 mm and a central angle of 74° and four small arcs with a radius of 2.5 mm tangent to the large arcs, the end face of the rear portion 7 away from the boundary is provided with a threaded hole 9, and a sealing ring installation groove 10 is provided between the threaded holes 9; the compression seal head connector 2 is T-shaped, and is provided with a through hole 11 used in conjunction with the threaded hole 9, a bolt installation avoidance groove 12, a weight reduction 13 and a limit hole 14 in sequence. The compression seal head connector 2 and the compression seal head 3 are both provided with an exhaust pipe channel 5. During assembly, the O-ring 4 is placed in the sealing ring installation groove 10, and the bolts pass through the through holes 11 through the bolt installation avoidance grooves 12 and enter the threaded holes 9, thereby achieving a sealed connection between the compression sealing head connector 2 and the compression sealing head 3.

[0030] Example 2

[0031] An external vacuum packaging machine containing the compression sealing assembly 1 in Example 1. Figure 4-8 The external vacuum packaging machine includes a workbench 15, on which a frame 16, a sealing mechanism 17, a compression and sealing mechanism 18, an exhaust pipe telescopic mechanism 19 and a control box 20 are fixed. Among them, a packaging bag support platform 21 and a cylinder mounting plate 22 are fixed on the frame 16; the sealing mechanism 17 includes a second cylinder 30 arranged on the cylinder mounting plate 22, a second cylinder connecting assembly 31 connected to the second cylinder 30, and a heat sealer 32 matched with the second cylinder connecting assembly 31; the compression and sealing mechanism 18 includes a first cylinder 23 arranged on the cylinder mounting plate 22, a first cylinder connecting assembly 24 connected to the first cylinder 23, an upper silicone block 25 connected to the first cylinder connecting assembly 24, and a lower silicone block used in conjunction with the upper silicone block 25. Block 26, a pressure block mounting seat 27 for mounting the lower silicone pressure block 26, a compression sealing component 1 arranged between the upper silicone pressure block 25 and the lower silicone pressure block 26 for use with the two, a compression sealing component limit pin 28, and a limit pin mounting seat 29 for mounting the compression sealing component limit pin 28; the exhaust pipe telescopic mechanism 19 includes an exhaust pipe 33, an exhaust pipe limit piece 34, and an exhaust pipe mounting seat 35 supporting the exhaust pipe 33 and the exhaust pipe limit piece 34. The front end of the exhaust pipe 33 is a hollow cone 36, and a portion adjacent to the hollow cone 36 is provided with lateral openings 37 distributed along the circumference.

[0032] Using the external vacuum packaging machine in Example 2 to vacuumize the product includes the following steps:

[0033] (1) The operator places the packaging bag containing the product on the packaging bag support table 21, then inserts the pressing and sealing head 3 into the packaging bag, moves the exhaust pipe 33 so that the exhaust pipe 33 passes through the front of the pressing and sealing head 2 and approaches the product to be packaged, presses the start button in the control box 20, and the first cylinder 23 starts to press down, driving the upper silicone block 25 to move downward until the upper silicone block 25 and the lower silicone block 26 are pressed on the upper and lower surfaces of the packaging bag respectively, and the front outer surface of the pressing and sealing head 3 and the inner surface of the packaging bag are tightly fitted, and then vacuum is drawn.

[0034] (2) When the vacuum degree reaches -0.095Mpa, the indicator light comes on, and the operator pulls out the vacuum tube 33 in the packaging bag until the vacuum tube stopper 34 contacts the vacuum tube mounting seat 35. At this time, during the process of pulling out the vacuum tube 33, only the relative position of the vacuum tube 33 and the pressing and sealing head 3 changes, and the two are always sealed by the O-ring, and the relative position between the pressing and sealing head 3 and the packaging bag does not change, and the packaging bag is always sealed.

[0035] (3) Press the heat sealing button in the control box 20, the second cylinder 30 drives the second cylinder connecting assembly 31 to press down, and then drives the heat sealing machine 32 to perform heat sealing. After the heat sealing is completed, the first cylinder 23 and the second cylinder 30 are automatically lifted up, and the operator takes out the packaging bag to complete the vacuum packaging of the product.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A compression sealing assembly for an external vacuum packaging machine, characterized in that: The compression sealing assembly (1) comprises a compression sealing head connector (2), a compression sealing head (3) and a sealing ring (4); the compression sealing head connector (2) is sealedly connected to the compression sealing head (3) via a sealing ring (4); the compression sealing head connector (2) and the compression sealing head (3) are both provided with an exhaust pipe channel (5); the compression sealing head (3) comprises an integrally formed front portion (6) and a rear portion (7), the boundary between the front portion (6) and the rear portion (7) having a chamfer (8), and the cross-sectional profile of the front portion is surrounded by two large arcs and four small arcs tangent to the large arcs respectively.

2. A compression sealing assembly for an external vacuum packaging machine as claimed in claim 1, characterized in that: The radii of the two large arcs are both 7.5-30 mm, the central angles of the two arcs are both 30°-180°, and the radii of the four small arcs are both 1.2-10 mm.

3. A compression sealing assembly for an external vacuum packaging machine as claimed in claim 1, characterized in that: The degree of the chamfer (8) is 30°-40°.

4. A compression sealing assembly for an external vacuum packaging machine as claimed in claim 1, characterized in that: The sealing ring (4) is an O-shaped sealing ring.

5. A compression sealing assembly for an external vacuum packaging machine according to any one of claims 1 to 4, characterized in that: The end surface of the rear portion (7) away from the boundary is provided with a threaded hole (9), and a sealing ring installation groove (10) is provided between the threaded holes (9).

6. A compression sealing assembly for an external vacuum packaging machine as claimed in claim 5, characterized in that: In a direction away from the clamping sealing head (3), the clamping sealing head connector (2) is provided with a through hole (11) for use with the threaded hole (9), a bolt installation avoidance groove (12), a weight reduction hole (13) and a limit hole (14) in sequence.

7. An external vacuum packaging machine, comprising the compression sealing assembly for an external vacuum packaging machine according to any one of claims 1 to 6, characterized in that: The invention comprises a workbench (15), on which a frame (16), a sealing mechanism (17), a pressing and sealing mechanism (18), an exhaust pipe telescopic mechanism (19) and a control box (20) are fixed; a packaging bag support platform (21) and a cylinder mounting plate (22) are fixed on the frame (16); the pressing and sealing mechanism (18) comprises a first cylinder (23) arranged on the cylinder mounting plate (22), a first cylinder connection assembly connected to the first cylinder (23), and a first cylinder connection assembly connected to the first cylinder (23). A component (24), an upper silicone pressure block (25) connected to the first cylinder connection component (24), a lower silicone pressure block (26) used in conjunction with the upper silicone pressure block (25), a pressure block mounting seat (27) for mounting the lower silicone pressure block (26), a compression seal component (1) arranged between the upper silicone pressure block (25) and the lower silicone pressure block (26), a compression seal component limit pin (28), and a limit pin mounting seat (29) for mounting the compression seal component limit pin (28).

8. The external vacuum packaging machine according to claim 7, characterized in that: The sealing mechanism (17) comprises a second cylinder (30) arranged on the cylinder mounting plate (22), a second cylinder connecting assembly (31) connected to the second cylinder (30), and a heat sealer (32) cooperating with the second cylinder connecting assembly (31).

9. The external vacuum packaging machine according to claim 7, characterized in that: The air extraction pipe telescopic mechanism (19) comprises an air extraction pipe (33), an air extraction pipe stopper (34), and an air extraction pipe mounting seat (35) supporting the air extraction pipe (33) and the air extraction pipe stopper (34).

10. The external vacuum packaging machine according to claim 9, characterized in that: The front end of the air extraction pipe (33) is a hollow cone (36), and a portion adjacent to the hollow cone (36) is provided with lateral openings (37) distributed along the circumference.

Images