A multi-volume piston filling cylinder and filling machine

Abstract

The present application relates to a kind of multi-volume piston filling cylinder and filling machine, filling cylinder includes outer cylinder body, multiple groups of outer piston rod, inner piston rod is arranged inside outer cylinder body, and can reciprocate along the length direction of outer cylinder body;Multiple groups of outer piston rod are arranged between the outer cylinder body and inner piston rod, the outer piston rod is successively set in the periphery of inner piston rod, the piston end of the inner piston rod is sealingly connected to the inner wall of adjacent outer piston rod, and the piston end of the outer piston rod is sealingly connected to the inner wall of outer cylinder body or outer adjacent outer piston rod;The inner piston rod can selectively connect any outer piston rod, for driving corresponding outer piston rod synchronous motion.The multi-volume piston filling machine provided by the present application can selectively connect the inner piston rod with different outer piston rods under the condition that the main body structure of equipment is unchanged, so as to form the piston assembly that can synchronously move, and cooperate with different cylinder diameter, realize the variable volume of filling machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filling equipment, in particular to a multi-volume piston type filling cylinder and filling machine. BACKGROUND

[0002] The main components of the quantitative filling machine include a piston (plunger) and a cylinder, and the filling capacity is adjusted by adjusting the stroke of the driving device to drive the piston stroke adjustment. The specification of the filling machine is determined by the piston (plunger) and the cylinder volume. In general, in order to meet the accuracy requirements, the capacity range is about 1 / 3-2 / 3 of the full capacity, and the filling accuracy is poor or cannot be filled when the capacity range exceeds the range, so a filling machine needs to be matched to meet the filling accuracy and filling capacity. How to expand the capacity range of the filling machine is a problem to be solved. SUMMARY

[0003] The purpose of the present application is to provide a multi-volume piston type filling cylinder and filling machine, which realizes the variable capacity of the filling machine by automatically switching different cylinder diameters and pistons.

[0004] To achieve the above purpose, the present application provides the following technical scheme: a multi-volume piston type filling cylinder, comprising an outer cylinder, a plurality of outer piston rods, and an inner piston rod capable of reciprocating along the length direction of the outer cylinder; the plurality of outer piston rods are arranged between the outer cylinder and the inner piston rod, the outer piston rods are sequentially sleeved on the periphery of the inner piston rod, the piston end of the inner piston rod is sealingly connected to the inner wall of the adjacent outer piston rod, and the piston end of the outer piston rod is sealingly connected to the inner wall of the outer cylinder or the outer piston rod on the outer side; the inner piston rod is selectively connected to any outer piston rod for driving the corresponding outer piston rod to move synchronously.

[0005] As a preferred scheme, the end of the piston end of the inner piston rod and the outer piston rod is sealingly connected with a pressure plate, respectively, and the pressure plate is used to support the piston end to prevent it from deforming during movement.

[0006] As a preferred scheme, the inner piston rod is designed as a hollow structure, which can reduce the cost and reduce the self-weight of the inner piston rod.

[0007] As a preferred scheme, the inner piston rod is provided with a mounting opening, and the filling cylinder further comprises an adjusting assembly arranged in the mounting opening, and the adjusting assembly is used to selectively connect the inner piston rod to any outer piston rod.

[0008] As a preferred scheme, the adjusting assembly comprises a linear actuator connected to the inside of the inner piston rod, a sliding block connected to the output end of the linear actuator, and a positioning piece abutting against the sliding block, the sliding block is used to push the positioning piece to move towards the outer piston rod, and the outer piston rod is provided with a positioning hole matched with the positioning piece.

[0009] As a preferred scheme, the positioning member comprises a guide member connected to the outer wall of the inner piston rod, and a positioning pin penetrating the guide member, the bottom end of the positioning pin is connected with a roller, and the periphery of the positioning pin is sleeved with an elastic part, and the elastic part is arranged between the guide member and the roller.

[0010] As a preferred scheme, the positioning member is arranged in at least two groups and is arranged oppositely, so as to ensure the stability of the connection between the inner piston rod and the corresponding outer piston rod.

[0011] As a preferred scheme, the linear driver is a multi-position air cylinder.

[0012] As a preferred scheme, the sliding block comprises a plurality of sub-sliding blocks which are connected to each other in the horizontal direction, the longitudinal section of the sub-sliding block is trapezoidal, and a cylindrical platform is arranged between adjacent sub-sliding blocks.

[0013] The application also provides a technical scheme of a filling machine, which comprises the multi-volume piston type filling cylinder of any one of the above schemes.

[0014] Compared with the prior art, the application has the following beneficial effects:

[0015] The multi-volume piston type filling machine provided by the application can realize the selective connection of the inner piston rod with different outer piston rods, so as to form a piston assembly capable of synchronous movement, and can realize the variable volume of the filling machine by cooperating with different cylinder diameters, the filling machine has high cost performance, is simple to operate, and is convenient to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 is a front view of the filling machine in the embodiment of the application;

[0017] Figure 2 Fig. 3 is a bottom view of the filling machine in the embodiment of the application;

[0018] Figure 3 Fig. 4 is a structural schematic view of the multi-volume piston type filling cylinder in the embodiment of the application;

[0019] Figure 4 Fig. 5 is a structural schematic view of the multi-volume piston type filling cylinder in the initial state in the embodiment of the application;

[0020] Figure 5 Fig. 6 is a structural schematic view of the multi-volume piston type filling cylinder in the one-stroke state of the multi-position air cylinder in the embodiment of the application;

[0021] Figure 6 Fig. 7 is a structural schematic view of the multi-volume piston type filling cylinder in the two-stroke state of the multi-position air cylinder in the embodiment of the application;

[0022] Figure 7It is a structure schematic view of the slider in the embodiment of the present application.

[0023] Figure 8 It is a structure schematic view of the positioning member in the embodiment of the present application.

[0024] The meanings of the respective reference numerals in the drawings are as follows:

[0025] 1, outer cylinder body; 2, inner piston rod; 21, mounting opening; 3, outer piston rod; 31, first outer piston rod; 32, second outer piston rod; 4, pressure plate; 5, adjusting assembly; 51, linear driver; 52, slider; 521, sub-slider; 522, cylindrical platform; 53, positioning member; 531, guide member; 532, positioning pin; 533, roller; 534, elastic member; 54, thrust nut; 6, positioning hole; 7, driving member; 8, storage tank; 9, quick-mount chuck assembly; 10, reversing valve; 11, filling pipeline; 12, filling nozzle. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 a limitation on the present application.

[0028] Referring to Figures 1-3 The embodiment discloses a multi-volume piston type filling cylinder used in a quantitative filling device to realize adjustment of the filling capacity of the filling device.

[0029] Referring to Figure 3 The filling cylinder comprises an outer cylinder body 1, one end of the outer cylinder body 1 is open, serving as a material inlet and outlet, and is used for connecting a reversing valve 10 of a filling device, the inner cylinder body 1 is internally provided with an inner piston rod 2 capable of reciprocating along the length direction of the outer cylinder body 1, one end of the inner piston rod 2 penetrates out of the outer cylinder body 1 and is connected with a driving member 7, and the inner piston rod 2 is driven to reciprocate by the driving member 7.

[0030] The filling cylinder further comprises a plurality of outer piston rods 3 arranged between the outer cylinder body 1 and the inner piston rod 2, when the inner piston rod 2 is at the maximum stroke, the length of the outer piston rod 3 in the outer cylinder body 1 is equal to that of the inner piston rod 2, the outer piston rod 3 is sequentially sleeved on the periphery of the inner piston rod 2, for example, the number of the outer piston rod 3 is n, the first outer piston rod 31 is sleeved on the periphery of the inner piston rod 2, the second outer piston rod 32 is sleeved on the periphery of the first outer piston rod 31, and the nth outer piston rod is sleeved on the periphery of the (n-1)th outer piston rod, and the piston end of the nth outer piston rod is sealingly connected to the inner wall of the outer cylinder body 1, and similarly, the piston end of each piston rod is sealingly connected to the inner wall of the adjacent piston rod, and a sealing ring is usually sleeved on the piston end of the piston rod to ensure the sealing of the connection.

[0031] The end head of the inner piston rod 2 and each outer piston rod 3 at the piston end is connected with a pressure plate 4 through a bolt, the pressure plate 4 is used for supporting the piston end to prevent it from deforming during movement, and a bolt sealing ring is connected with the bolt to improve the sealing effect; a sealing ring is usually connected between the pressure plate 4 and the piston end to further improve the sealing effect and prevent the material from entering.

[0032] It can be understood that each group of outer piston rods 3 is designed as a hollow, the other end of the outer piston rod 3 away from the piston end is arranged as a ring and abuts against the outer wall of the adjacent inner piston rod; similarly, the other end of the outer cylinder body 1 is also arranged as a ring and abuts against the outer wall of the nth outer piston rod.

[0033] The inner piston rod 2 can be designed as a solid or a hollow. In order to reduce the cost and reduce the self-weight of the inner piston rod 2, in the embodiment, the inner piston rod 2 is preferably designed as a hollow, and the corresponding connecting end can be designed as a thickened design, in the embodiment, in the state that the inner piston rod 2 is horizontally placed, the hollow design can reduce the pressure on the lower piston end and the sealing ring and reduce the degree of wear.

[0034] An adjusting assembly 5 is connected in the inner piston rod 2, the adjusting assembly 5 is arranged on the side close to the driving member 7, and the adjusting assembly 5 is used for selectively connecting the inner piston rod 2 to different outer piston rods 3, so that the inner piston rod 2 and the corresponding outer piston rod 3 jointly form a piston assembly and move synchronously to realize the adjustment of the cylinder capacity. Specifically, a mounting opening 21 is arranged on the side of the inner piston rod 2 close to the driving member 7, the adjusting assembly 5 enters the inner piston rod 2 through the mounting opening 21 and is installed in the inner piston rod 2.

[0035] The adjusting assembly 5 comprises a linear driver 51 fixedly connected to the inside of the inner piston rod 2, a sliding block 52 fixedly connected to the output end of the linear driver 51, and a positioning member 53 abutting against the sliding block 52.

[0036] In this embodiment, the linear driver 51 is preferably a multi-position cylinder with simple structure and easy to operate. The output end of the multi-position cylinder and the sliding block 52 are fixed by screw adjustment and fastened by the thrust nut 54 to prevent loosening. The positioning member 53 penetrates the outer wall of the inner piston rod 2. In other embodiments, the linear driver 51 can also adopt a linear electric drive structure such as a linear motor, which is fixed inside the inner piston rod 2, and the output end of the linear electric drive structure is connected to the sliding block 52.

[0037] The multi-position cylinder is used to drive the sliding block 52 to reciprocate in the horizontal direction. The sliding block 52 is generally a transversely arranged cone. The movement of the sliding block 52 drives the positioning member 53 to move towards the outer piston rod 3. Correspondingly, each group of outer piston rods 3 is provided with a positioning hole 6 matched with the position of the positioning member 53. Through the cooperation of the positioning member 53 and the positioning hole 6, the inner piston rod 2 and the corresponding outer piston rod 3 can be connected as a whole and move synchronously in the horizontal direction.

[0038] To ensure the stability of the connection between the inner piston rod 2 and the corresponding outer piston rod 3, the positioning member 53 is arranged in at least two groups and is arranged oppositely. In other embodiments, it can also be arranged in four groups or even more groups. Figure 8 The positioning member 53 further includes a guide member 531 fixedly connected to the outer wall of the inner piston rod 2 and a positioning pin 532 penetrating the guide member 531. The bottom end of the positioning pin 532 is provided with a roller 533 which abuts against the sliding block 52. The top end of the positioning pin 532 is located in the guide member 531. An elastic member 534 is sleeved on the periphery of the positioning pin 532. The elastic member 534 is preferably a spring. The top end of the spring abuts against the bottom end of the guide member 531. The guide member 531 can be used for limiting the top of the spring. The roller 533 can be used for limiting the bottom of the spring. The guide member 531 can be a linear shaft sleeve or a copper bolt with a through hole in the middle. Here, it is not specifically limited.

[0039] In actual application, the multi-position cylinder drives the sliding block 52 to move in the horizontal direction, and then pushes the positioning pin 532 to move towards the outer piston rod 3. The positioning pin 532 is pushed into the positioning hole 6 of the outer piston rod 3, so that the inner piston rod 2 and the corresponding outer piston rod 3 form a piston assembly and move synchronously. At this time, the spring is in a compressed state. When the output end of the multi-position cylinder is retracted, the positioning pin 532 is reset under the action of the spring, so that the inner piston rod 2 and the corresponding outer piston rod 3 are disconnected.

[0040] In this embodiment, the multi-position cylinder can stay at multiple stroke positions. The positioning pin 532 can be selectively connected to different outer piston rods 3. The number of strokes of the multi-position cylinder is not less than the number of outer piston rods 3.

[0041] In combination with Figure 7To ensure the stable setting of the positioning pin 532 on the slider 52, in a preferred embodiment, the slider 52 further comprises a plurality of sub-sliders 521 which are connected to each other in the horizontal direction, the longitudinal section of the sub-sliders 521 is trapezoidal, the adjacent sub-sliders 521 are connected by a cylindrical platform 522, and the first end and the tail end of the sub-sliders 521 are respectively connected with a matching cylindrical platform 522. Because the outer end surface of the cylindrical platform 522 is not inclined compared with the sub-sliders 521, the bottom end of the positioning pin 532 abuts against the surface of the cylindrical platform 522, which can ensure its stable setting. On the other hand, the cylindrical platform 522 can also play a buffering role, so that the pushing state of the slider 52 has a certain amount of floating, preventing the positioning pin 532 and the positioning hole 6 from being misaligned due to inaccurate stroke adjustment of the multi-position cylinder. It can be understood that the stroke distance of each of the multi-position cylinder should be matched with the spacing between the corresponding cylindrical platform 522.

[0042] For the sake of understanding, the action process of the multi-volume piston filling cylinder provided by the present embodiment is introduced as follows:

[0043] Referring to Figure 4 , in the initial state, the multi-position cylinder is not in action, the top end of the positioning pin 532 is located in the guide 531, and the bottom end of the positioning pin 532 abuts against the cylindrical platform at the end of the slider 52. At this time, the inner piston rod 2 and the first outer piston rod 31 form a filling cylinder, the inner piston rod 2 acts as a moving piston and can move horizontally reciprocatingly under the driving of the driving member 7, and the first outer piston rod 31 acts as a cylinder wall.

[0044] Referring to Figure 5 , when the multi-position cylinder starts a stroke, the slider 52 is pushed to move horizontally forward, and each positioning pin 532 is pushed to move in the direction close to the outer piston rod 3 to reach a predetermined position, the top end of the positioning pin 532 is inserted into the positioning hole 6 of the first outer piston rod 31, so that the inner piston rod 2 and the first outer piston rod 31 combine to form a piston assembly, and the second outer piston rod 32 forms a filling cylinder with the piston assembly. At this time, the piston assembly formed by the inner piston rod 2 and the first outer piston rod 31 acts as a moving piston and can move horizontally reciprocatingly under the driving of the driving member 7, and the second outer piston rod 32 acts as a cylinder wall. At this time, the volume replacement of the filling cylinder has been realized. When the slider 52 is retracted, the positioning pin 532 is released to reset under the action of the elastic member 534, so that the inner piston rod 2 and the first outer piston rod 31 are separated.

[0045] Referring to Figure 6When the multi-cylinder starts the second stroke, the slider 52 is pushed to move horizontally forward, and each positioning pin 532 is pushed to move towards the first outer piston rod 31 and the second outer piston rod 32, to reach a predetermined position, and the top end of the positioning pin 532 is inserted into the positioning hole 6 of the first outer piston rod 31 and the second outer piston rod 32, so that the inner piston rod 2, the first outer piston rod 31 and the second outer piston rod 32 are combined to form a piston assembly, and the third outer piston rod is used as a cylinder wall.

[0046] Similarly, the variable volume of the multi-volume piston filling cylinder is realized. The multi-volume piston filling cylinder provided in the embodiment can realize the variable volume of the filling machine by automatically switching the connection between the inner piston rod 2 and different outer piston rods 3, and has high cost performance, simple operation and easy maintenance.

[0047] Based on the multi-volume piston filling cylinder provided in the above embodiment, the embodiment further provides a filling machine, which is described below with reference to Figure 1 and Figure 2 The filling machine includes the multi-volume piston filling cylinder and a driving member 7 fixedly connected to one end of the inner piston rod 2. The driving member 7 can adopt a linear driving structure including but not limited to a linear cylinder and an electric screw rod, and drives the inner piston rod 2 or the corresponding piston assembly to move horizontally and reciprocally.

[0048] The filling machine further includes a storage tank 8 for storing materials, and a reversing valve 10 connected to the outlet end of the storage tank 8 through a quick-mount chuck assembly 9. The quick-mount chuck assembly 9 includes a sanitary chuck, a gasket and a clamp for sealing connection.

[0049] The reversing valve 10 is provided with a first channel, a second channel and a third channel. The first channel is arranged at the top end of the reversing valve 10 and connected to the outlet end of the storage tank 8. The second channel is arranged at the side end of the reversing valve 10 and connected to the inlet and outlet of one end of the outer cylinder body 1 of the multi-volume piston filling cylinder through the quick-mount chuck assembly 9. The third channel is arranged at the bottom end of the reversing valve 10 and connected to a filling pipeline 11 through the quick-mount chuck assembly 9. The filling pipeline 11 is connected to a filling nozzle 12 at the end thereof. The filling nozzle 12 is used as a material outlet for filling materials into a packaging object. The reversing valve 10 is a prior art, and its structure is not described herein.

[0050] In actual application, the materials to be filled are stored in the storage tank 8. When filling, the reversing valve 10 is opened, and the driving member 7 is started to drive the inner piston rod 2 to move, so that the constant-volume materials are sucked from the storage tank 8 into the filling cylinder. Then, the reversing valve 10 is closed, and the driving member 7 drives the inner piston rod 2 to press the materials out of the filling cylinder, into the filling pipeline 11 and out of the filling nozzle 12 into the packaging object. The above actions are repeated to realize continuous filling.

[0051] Because the diameter of each outer piston rod 3 is different, the friction force generated by its movement is also different, the larger the diameter of the outer piston rod 3, the greater the movement friction, that is, the greater the required pushing force. Under the action of the same pushing force, the small-diameter outer piston rod 3 performs piston movement, which does not affect the relatively large-diameter outer piston rod 3, and the large-diameter outer piston rod 3 is still in a static state.

[0052] When switching the cylinder diameter, the multi-position cylinder is connected to compressed air, which drives the sliding block 52 to move, so that the positioning pin 532 is displaced and passes through the positioning hole 6 of the outer piston rod 3, and then the inner piston rod 2 and the corresponding outer piston rod 3 form a piston assembly, synchronously move, and combine with the adjacent outer outer piston rod 3 to form a filling cylinder.

[0053] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-volume piston filling cylinder, characterized in that, it comprises: an outer cylinder (1) internally provided with an inner piston rod (2) capable of reciprocating along the length direction of the outer cylinder (1); a plurality of outer piston rods (3) arranged between the outer cylinder (1) and the inner piston rod (2), the outer piston rods (3) being sequentially sleeved on the periphery of the inner piston rod (2), the piston end of the inner piston rod (2) being sealingly connected to the inner wall of the adjacent outer piston rod (3), and the piston end of the outer piston rod (3) being sealingly connected to the inner wall of the outer cylinder (1) or the outer piston rod (3) on the outer side; the inner piston rod (2) is provided with a mounting opening (21), and the filling cylinder further comprises an adjusting assembly (5) arranged in the mounting opening (21), the adjusting assembly (5) being used for selectively connecting the inner piston rod (2) to any outer piston rod (3) to drive the corresponding outer piston rod (3) to move synchronously; the adjusting assembly (5) comprises a linear actuator (51) connected to the inside of the inner piston rod (2), a sliding block (52) connected to the output end of the linear actuator (51), and a positioning member (53) abutting against the sliding block (52), the sliding block (52) being used for pushing the positioning member (53) to move towards the outer piston rod (3), and the outer piston rod (3) being provided with a positioning hole (6) matched with the positioning member (53); the positioning member (53) comprises a guide member (531) connected to the outer wall of the inner piston rod (2), and a positioning pin (532) penetrating the guide member (531), the bottom end of the positioning pin (532) being connected with a roller (533), and the periphery of the positioning pin (532) being sleeved with an elastic part, the elastic part being arranged between the guide member (531) and the roller (533).

2. The multi-volume piston filling cylinder according to claim 1, characterized in that, the end of the inner piston rod (2) and the outer piston rod (3) at the piston end is respectively sealingly connected with a pressure plate (4).

3. The multi-volume piston filling cylinder according to claim 1, characterized in that, the inner piston rod (2) is designed as a hollow structure.

4. The multi-volume piston filling cylinder according to claim 1, characterized in that, the positioning member (53) is arranged in at least two groups.

5. The multi-volume piston filling cylinder according to claim 1, characterized in that, the linear actuator (51) is a multi-position air cylinder.

6. The multi-volume piston filling cylinder according to claim 1, characterized in that, the sliding block (52) comprises a plurality of sub-sliding blocks (521) abutting against each other in the horizontal direction, the longitudinal section of the sub-sliding block (521) is trapezoidal, and adjacent sub-sliding blocks (521) are connected with a cylindrical platform (522).

7. A filling machine, characterized in that, it comprises the multi-volume piston filling cylinder according to any one of claims 1-6.

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