Adjustable supercharging device

Abstract

The utility model belongs to the technology of auxiliary hydraulic devices for bag making machines, and provides an adjustable supercharging device which comprises a cylinder body, a piston rod, an adjusting seat, a plunger rod, a threaded hand wheel and a spring. The piston rod is movably installed on the cylinder body and matched with the cylinder body to form an oil cavity used for containing hydraulic oil. The adjusting seat is connected to the cylinder body and matched with the cylinder body to form a containing cavity; the plunger rod penetrates through the cylinder body and can slide relative to the cylinder body in the axial direction of the plunger rod, the two ends of the plunger rod are located in the oil cavity and the containing cavity respectively, and the area of the end face, used for forming the oil cavity, of the piston rod is larger than that of the end face, in the oil cavity, of the plunger rod. The threaded hand wheel is in threaded connection with the adjusting seat, and the threaded part of the threaded hand wheel is coaxial with the plunger rod; the spring is arranged in the containing cavity, the elastic force direction is parallel to the plunger rod, and the two ends of the spring abut against the threaded hand wheel and the plunger rod respectively.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of auxiliary hydraulic devices for bag making machines, and particularly relates to an adjustable pressure increasing device. BACKGROUND

[0002] In the production process of a bag making machine, a heat sealing knife implements heat pressure sealing on a plastic film bag body by cooperating with a supporting plate, and the sealing quality is directly affected by the pressure control: if the pressure is too high, the film will be damaged, and if the pressure is insufficient, the sealing strength will be insufficient. In order to balance this contradiction, an elastic buffer mechanism (such as a compression spring) is generally arranged behind the heat sealing knife in the existing equipment, and the overload pressure is absorbed by the spring deformation. When the heat sealing pressure exceeds the preset threshold value, the heat sealing knife compresses the spring to produce a back displacement, so as to realize dynamic balance of the pressure. However, this buffer mechanism has a significant defect: for the difference in critical pressure values required for different materials and thicknesses of the film, the operator needs to frequently replace springs with different stiffness coefficients or manually adjust the spring pre-tightening force (such as changing the initial compression amount of the spring through a threaded structure). Such mechanical adjustment method is time-consuming and laborious, and seriously restricts the production efficiency. Therefore, it is necessary to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiment of the application is to provide an adjustable pressure increasing device to solve the technical problem of inconvenient heat sealing pressure adjustment in the prior art.

[0004] To achieve the above purpose, the technical scheme adopted by the application is to provide an adjustable pressure increasing device, comprising:

[0005] a cylinder body;

[0006] a piston rod movably installed on the cylinder body and cooperating with the cylinder body to form an oil cavity for containing hydraulic oil;

[0007] an adjusting seat connected to the cylinder body and cooperating with the cylinder body to form a containing cavity;

[0008] a plunger rod penetrating through the cylinder body and capable of sliding along the axis of itself relative to the cylinder body, both ends of the plunger rod being located in the oil cavity and the containing cavity respectively, and the area of the end face of the piston rod for forming the oil cavity being greater than the area of the end face of the plunger rod in the oil cavity;

[0009] a threaded hand wheel in threaded connection with the adjusting seat and the threaded part of the threaded hand wheel being coaxial with the plunger rod;

[0010] a spring arranged in the containing cavity and having a spring force direction parallel to the plunger rod, both ends of the spring abutting against the threaded hand wheel and the plunger rod respectively.

[0011] Optionally, the adjustable supercharging device further comprises an upper cylinder cover and a lower cylinder cover connected to the cylinder body and arranged axially spaced apart along the piston rod;

[0012] The upper cylinder cover cooperates with the cylinder body and the piston rod to form the oil cavity, and the lower cylinder cover cooperates with the cylinder body and the piston rod to form a cavity in communication with the atmosphere, and the piston rod penetrates through the lower cylinder cover and is in sliding connection with the lower cylinder cover.

[0013] Optionally, the adjustable supercharging device further comprises a sealing cover and a plurality of sealing rings coaxially arranged with the plunger rod;

[0014] The sealing cover is abutted against one side of the upper cylinder cover away from the oil cavity and is clamped by the adjusting seat and the upper cylinder cover, the plunger rod penetrates through the sealing cover, and the upper cylinder cover and the plunger rod are respectively in sealing connection with the sealing cover through the sealing rings.

[0015] Optionally, the adjustable supercharging device further comprises a muffler for sound reduction;

[0016] The muffler is connected to the cylinder body, and the cavity is in communication with the atmosphere through the muffler.

[0017] Optionally, the adjustable supercharging device further comprises a pressure gauge;

[0018] The pressure gauge is connected to the cylinder body and is used for detecting the internal pressure of the oil cavity.

[0019] The adjustable supercharging device provided in the application has the following beneficial effects: compared with the prior art, in the adjustable supercharging device provided in the application, the area of the end surface of the piston rod for forming the oil cavity is greater than the area of the end surface of the plunger rod in the oil cavity, and the hydraulic pressure in the sealed oil cavity is equal everywhere, so that the piston rod can form the technical effect of amplifying the pressure on the plunger rod, i.e., when the threaded hand wheel rotates relative to the adjusting seat and drives the plunger rod to axially slide through the spring, the pressure of the spring acting on the plunger rod will be amplified on the piston rod according to a certain proportion. In this way, when the target heat sealing knife is connected to the piston rod, only when the pressure between the target heat sealing knife and the target supporting plate is greater than the pressure of the hydraulic oil acting on the piston rod, the plunger rod can push the spring to retreat to ensure that the heat sealing pressure is stable, and the pressure of the hydraulic oil acting on the plunger rod is still much smaller than the pressure of the piston rod acting on the hydraulic oil. Therefore, in the application, the technical effect of doubling the spring force can be achieved through the fine adjustment of the spring compression amount, so that the adjustable supercharging device in the application can form a flexible adjustment effect and be applicable in different heat sealing working conditions, which is much better than the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the adjustable booster device in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the main structure of the adjustable booster device in the embodiments of this application;

[0023] Figure 3 For along Figure 2 Cross-sectional view of line AA in the middle;

[0024] Figure 4 For along Figure 2 Cross-sectional view of the middle BB line;

[0025] Figure 5 This is a schematic diagram illustrating the usage scenario of the adjustable booster device in the embodiments of this application.

[0026] The reference numerals in the figures are as follows: 101, cylinder block; 102, piston rod; 103, oil chamber; 104, adjusting seat; 105, receiving cavity; 106, plunger rod; 107, threaded handwheel; 108, spring; 109, upper cylinder head; 110, lower cylinder head; 111, cavity; 112, sealing cover; 113, sealing ring; 114, muffler; 115, pressure gauge; 201, target heat sealing knife; 202, target support plate. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate directions or positions based on the directions or positions shown in the drawings, and are used for convenience of description and simplification of description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0030] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0031] Please refer to Figures 1 to 5 , a kind of adjustable pressure increasing device provided by the embodiment of the application will be described.The adjustable pressure increasing device includes cylinder body 101, piston rod 102, adjusting seat 104, plunger rod 106, screw hand wheel 107 and spring 108, wherein:

[0032] Piston rod 102 is movably installed on cylinder body 101 and cooperates with cylinder body 101 to form oil chamber 103 for containing hydraulic oil;Adjusting seat 104 is connected to cylinder body 101 and cooperates with cylinder body 101 to form containing cavity 105;Plunger rod 106 penetrates cylinder body 101 and can slide along the axial direction of itself relative to cylinder body 101, both ends of plunger rod 106 are located in oil chamber 103 and containing cavity 105 respectively, the area of the end face of piston rod 102 for forming oil chamber 103 is greater than the area of the end face of plunger rod 106 in oil chamber 103;Screw hand wheel 107 is threadedly connected with adjusting seat 104, and the threaded portion of screw hand wheel 107 is coaxial with plunger rod 106;Spring 108 is arranged in containing cavity 105 and the spring force direction is parallel to plunger rod 106, both ends of spring 108 abut against screw hand wheel 107 and plunger rod 106 respectively.

[0033] According to the above structure provided in the embodiment, in the adjustable pressure increasing device provided in the embodiment, a predetermined amount of hydraulic oil is filled in the oil cavity 103 during assembly. Since the area of the end surface of the piston rod 102 used to form the oil cavity 103 is larger than the area of the end surface of the plunger rod 106 in the oil cavity 103, and since the hydraulic pressure in the closed oil cavity 103 is equal everywhere, the piston rod 102 can form a technical effect of amplifying the pressure on the plunger rod 106, i.e., when the threaded hand wheel 107 is rotated relative to the adjusting seat 104 and the plunger rod 106 is axially shifted by the spring 108, the pressure of the spring 108 acting on the plunger rod 106 is amplified or reduced in a certain proportion on the piston rod 102. As an application embodiment, when the target heat sealing knife 201 is connected to the piston rod 102, under the driving of the heat sealing driving device of the bag making machine, the adjustable pressure increasing device together with the target heat sealing knife 201 is pressed against the target supporting plate 202 to heat seal the bag body between the target heat sealing knife 201 and the target supporting plate 202. Only when the pressure between the target heat sealing knife 201 and the target supporting plate 202 is greater than the pressure of the hydraulic oil acting on the piston rod 102, the plunger rod 106 can push the spring 108 to retreat to ensure that the heat sealing pressure is stable, and the pressure of the hydraulic oil acting on the plunger rod 106 is far less than the pressure of the piston rod 102 acting on the hydraulic oil. Thus, the adjustable pressure increasing device in the application can realize the technical effect of amplifying the elastic force of the spring 108 by a plurality of times through the fine adjustment of the compression amount of the spring 108, so that the adjustable pressure increasing device in the application can form a flexible adjustment effect and be applied in different heat sealing working conditions. That is, when the thickness of the bag body is thick or the heat sealing pressure required due to the influence of the material characteristics of the bag body is large, the threaded hand wheel 107 can be screwed in to increase the compression amount of the spring 108 to increase the output pressure of the piston rod 102, and vice versa. Since the elastic force of the spring 108 and the output pressure of the piston rod 102 are in a multiple relationship under the action of the plunger rod 106, the operator can flexibly adjust the reaction force of the piston rod 102 under pressure with very light force. Thus, the adjustable pressure increasing device has the advantages of wide pressure adjustment range and easy adjustment, which is much better than the prior art.

[0034] In another embodiment of the application, please refer to Figures 1 to 5The adjustable supercharging device further comprises an upper cylinder cover 109 and a lower cylinder cover 110 connected to the cylinder body 101 and arranged axially spaced apart along the piston rod 102; the upper cylinder cover 109 cooperates with the cylinder body 101 and the piston rod 102 to form the oil cavity 103, the lower cylinder cover 110 cooperates with the cylinder body 101 and the piston rod 102 to form the cavity 111 which is communicated with the atmosphere, and the piston rod 102 penetrates through the lower cylinder cover 110 and is in sliding connection with the lower cylinder cover 110. According to the above structure provided in the embodiment, the cavity 111 formed by the lower cylinder cover 110 cooperating with the cylinder body 101 and the piston rod 102 can not only facilitate the movement of the piston rod 102, but also effectively isolate impurities through the lower cylinder cover 110, so as to improve the structural stability of the adjustable supercharging device in the embodiment.

[0035] In another embodiment of the present application, please refer to Figures 1 to 5 The adjustable supercharging device further comprises a sealing cover 112 and a plurality of sealing rings 113 coaxially arranged with the plunger rod 106; the sealing cover 112 abuts against a side of the upper cylinder cover 109 away from the oil cavity 103 and is clamped by the adjusting seat 104 and the upper cylinder cover 109, the plunger rod 106 penetrates through the sealing cover 112, and the upper cylinder cover 109 and the plunger rod 106 are respectively in sealing connection with the sealing cover 112 through the sealing rings 113. According to the above structure provided in the embodiment, the plurality of sealing rings 113 arranged between the sealing cover 112 and the upper cylinder cover 109 or between the sealing cover 112 and the plunger rod 106 can make the oil cavity 103 form a better sealing effect, so as to further improve the structural stability of the adjustable supercharging device in the embodiment.

[0036] In another embodiment of the present application, please refer to Figures 1 to 5 The adjustable supercharging device further comprises a muffler 114 for silencing; the muffler 114 is connected to the cylinder body 101, and the cavity 111 is communicated with the atmosphere through the muffler 114. According to the above structure provided in the embodiment, the muffler 114 arranged on the cylinder body 101 can effectively reduce the noise generated when the piston rod 102 moves in the cavity 111, so as to make the adjustable supercharging device in the embodiment form a better use effect.

[0037] In another embodiment of the present application, please refer to Figures 1 to 5 The adjustable supercharging device further comprises a pressure gauge 115; the pressure gauge 115 is connected to the cylinder body 101 and is used for detecting the internal pressure of the oil cavity 103. According to the above structure provided in the embodiment, the pressure gauge 115 connected to the cylinder body 101 can enable the staff to quickly learn the oil pressure in the oil cavity 103, so as to enable the adjustable supercharging device in the embodiment to stably operate for a longer time.

[0038] The above only describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An adjustable pressure increasing device, characterized by, The adjustable supercharging device comprises a cylinder (101), a piston rod (102) movably mounted on the cylinder (101) and cooperating with the cylinder (101) to form an oil chamber (103) for containing hydraulic oil, an adjusting seat (104) connected to the cylinder (101) and cooperating with the cylinder (101) to form a containing chamber (105), a plunger rod (106) penetrating through the cylinder (101) and capable of sliding along its own axis relative to the cylinder (101), both ends of the plunger rod (106) being located in the oil chamber (103) and the containing chamber (105) respectively, the piston rod (102) being used to form an end face of the oil chamber (103) with an area greater than that of an end face of the plunger rod (106) in the oil chamber (103), a threaded hand wheel (107) threadedly connected with the adjusting seat (104) and having a threaded portion coaxial with the plunger rod (106), and a spring (108) arranged in the containing chamber (105) and having a spring force direction parallel to the plunger rod (106), both ends of the spring (108) abutting against the threaded hand wheel (107) and the plunger rod (106) respectively.

2. The adjustable supercharging device according to claim 1, further comprising an upper cylinder cover (109) and a lower cylinder cover (110) axially spaced apart along the piston rod (102) and connected to the cylinder (101).

3. The adjustable supercharging device according to claim 2, further comprising a sealing cover (112) and a plurality of sealing rings (113) coaxially arranged with the plunger rod (106).

4. The adjustable supercharging device according to claim 2, further comprising a muffler (114) for sound attenuation.

5. The adjustable supercharging device according to claim 1, further comprising a pressure gauge (115). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The pressure gauge (115) is connected to the cylinder body (101) and is used to detect the internal pressure of the oil cavity (103).

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