Filling valve, working method of filling valve and filling machine

Abstract

The present invention discloses a filling valve, a working method of the filling valve and a filling machine. The filling valve includes a valve body, a first valve stem, a second valve stem and a piston. The interior of the valve body is hollow to form a valve cavity. The valve cavity forms a feed port and a discharge port on the surface of the valve body. The first valve stem, the second valve stem and the piston are all movably arranged inside the valve body. The first valve stem is close to the feed port and can selectively block the valve cavity. The second valve stem is close to the discharge port and can selectively block the valve cavity. The second valve stem can extend out of the discharge port. The piston is arranged between the first valve stem and the second valve stem. The piston sucks the material into and discharges the valve cavity. The first valve stem, the second valve stem and the piston of the filling valve of the present invention work together to allow the material to enter the valve cavity in an orderly manner and then be discharged from the valve cavity. The second valve stem can block the valve cavity to avoid the material from leaking out of the valve cavity and causing material waste, thereby preventing the machine from being contaminated. By controlling the first valve stem and the second valve stem, the valve cavity can be in a connected state, which is convenient for the cleaning liquid to flush the valve cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of filling equipment, and in particular to a filling valve, a working method of the filling valve and a filling machine. Background Art

[0002] In the filling industry, plunger filling valves are generally used for filling liquids containing large particles or viscous materials. The plunger filling valve is a quantitative filling valve, generally composed of a rotary valve, a piston and a quantitative cylinder. The working principle is: the rotary valve core rotates to close the discharge port and open the feed port, the piston moves to suck the material into the quantitative cylinder, and then the rotary valve core rotates again to close the feed port and open the discharge port, and the piston moves to discharge the material from the discharge port and fill it into the bottle. When this filling valve is installed on a rotary filling machine, the rotation of the rotary valve core is generally performed by a swing arm cam mechanism. When the filling valve passes a specific position, the rotary valve core rotates once. When there is no bottle under the filling valve, the swing arm cam mechanism will also drive the rotary valve core to rotate and open the discharge port. At this time, some materials will flow out of the valve port and drip onto the machine, causing material waste and increasing the cleaning workload of the machine. In addition, it is difficult to clean the inside of this filling valve during online cleaning because the feed port and discharge port of the rotary valve cannot be opened at the same time, the cleaning liquid cannot flow continuously in the valve, and it is difficult for the cleaning liquid to reach the flow rate required for cleaning. Summary of the invention

[0003] The object of the present invention is to provide a filling valve, a working method of the filling valve and a filling machine, which can reduce material waste and facilitate cleaning.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] On the one hand, a filling valve is provided, comprising a valve body, a first valve stem, a second valve stem and a piston, wherein the interior of the valve body is hollow to form a valve cavity, and the valve cavity forms a feed port and a discharge port on the surface of the valve body, the first valve stem, the second valve stem and the piston are all movably arranged inside the valve body, the first valve stem is close to the feed port and can selectively block the valve cavity, the second valve stem is close to the discharge port and can selectively block the valve cavity, the second valve stem can extend out of the discharge port, the piston is arranged between the first valve stem and the second valve stem, and the piston sucks and discharges the material into and out of the valve cavity.

[0006] As a preferred solution of the present invention, the filling valve further comprises a first cylinder, a second cylinder and a third cylinder, the first cylinder is connected to the first valve stem, the second cylinder is connected to the second valve stem, and the third cylinder is connected to the piston.

[0007] As a preferred embodiment of the present invention, the filling valve also includes a pressure relief mechanism, the third cylinder is a double-shaft cylinder, one end of the cylinder shaft of the third cylinder is connected to the piston, and the other end of the cylinder shaft selectively abuts against the pressure relief mechanism, and the pressure relief mechanism enables the piston to continue to move a set distance after sucking in the material to expand the volume of the valve chamber.

[0008] As a preferred solution of the present invention, the pressure relief mechanism includes a fourth cylinder, and the cylinder shaft of the fourth cylinder selectively abuts against the cylinder shaft of the third cylinder.

[0009] As a preferred solution of the present invention, a buffer pad is provided on the cylinder shaft of the fourth cylinder or the third cylinder.

[0010] As a preferred solution of the present invention, the pressure relief mechanism further includes an adjusting member, the fourth cylinder is fixed on the adjusting member, and the adjusting member is used to adjust the distance between the fourth cylinder and the third cylinder.

[0011] As a preferred solution of the present invention, a first sealing member is sleeved on the first valve stem, and the first sealing member can abut against the inner wall of the valve body to achieve sealing. A second sealing member is provided inside the valve body, and the second sealing member is arranged close to the discharge port. The second valve stem can pass through the second sealing member, so that the second sealing member is sleeved on the second valve stem.

[0012] On the other hand, a working method of a filling valve is provided, comprising the following steps:

[0013] S1. The second valve stem is in a state of blocking the valve cavity, and the first valve stem is in a state of not blocking the valve cavity;

[0014] S2. Make the piston move, the valve cavity volume increases, and the material is sucked into the valve cavity;

[0015] S3. The first valve stem is in a state of blocking the valve cavity, and the second valve stem is in a state of not blocking the valve cavity;

[0016] S4. The piston moves in the opposite direction, the volume of the valve cavity decreases, and the material is pushed out of the valve cavity;

[0017] S5. Extend the second valve stem out of the discharge port to push out the remaining material at the discharge port.

[0018] As a preferred solution of the present invention, step S2 specifically includes the following steps:

[0019] S21. The third cylinder drives the piston to move, the valve chamber volume increases, and the material is sucked into the valve chamber;

[0020] S22. The cylinder shaft of the third cylinder abuts against the pressure relief mechanism, and the cylinder shaft of the third cylinder and the piston temporarily stop moving;

[0021] S23. The pressure relief mechanism is activated, the cylinder shaft of the third cylinder and the piston continue to move a set distance, the volume of the valve cavity is further increased, and the pressure on the material in the valve cavity is reduced.

[0022] In addition, a filling machine is also provided, comprising a filling valve according to any of the above technical solutions.

[0023] Beneficial effects of the present invention:

[0024] The first valve stem, the second valve stem and the piston arranged in the valve cavity of the filling valve of the present invention all move independently. The three work together to allow the material to enter the valve cavity in an orderly manner and then be discharged from the valve cavity. The second valve stem can block the valve cavity to prevent the material from leaking out of the valve cavity and causing material waste, thereby preventing the filling machine from being contaminated. By controlling the first valve stem and the second valve stem, the valve cavity can be connected, which is convenient for the cleaning liquid to flush the valve cavity, thereby achieving high cleaning efficiency and good cleaning effect for the filling valve. Since the second valve stem can extend out of the discharge port, after the piston discharges the material, the second valve stem can discharge the material that may remain at the discharge port out of the valve cavity and fill it into the bottle, further saving the material and preventing the residual material from falling and contaminating the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional schematic diagram of a filling valve according to an embodiment of the present invention;

[0026] Figure 2 It is a flow chart of a working method of a filling valve according to an embodiment of the present invention;

[0027] Figure 3 The figure is a flow chart of a working method of a filling valve according to another embodiment of the present invention.

[0028] In the figure:

[0029] 1. Valve body; 11. First sealing member; 12. Second sealing member; 100. Valve chamber; 110. Feed inlet; 120. Feed outlet; 2. First valve stem; 3. Second valve stem; 4. Piston; 5. First cylinder; 6. Second cylinder; 7. Third cylinder; 8. Pressure relief mechanism; 81. Fourth cylinder; 82. Adjusting member; 9. Buffer pad. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0033] like Figure 1 As shown, the filling valve of this embodiment includes a valve body 1, a first valve stem 2, a second valve stem 3 and a piston 4. The interior of the valve body 1 is hollow to form a valve cavity 100. The valve cavity 100 forms a feed port 110 and a discharge port 120 on the surface of the valve body 1. The first valve stem 2, the second valve stem 3 and the piston 4 are all movably arranged inside the valve body 1. The first valve stem 2 is close to the feed port 110 and can selectively block the valve cavity 100. The second valve stem 3 is close to the discharge port 120 and can selectively block the valve cavity 100. The second valve stem 3 can extend out of the discharge port 120. The piston 4 is arranged between the first valve stem 2 and the second valve stem 3. The piston 4 sucks the material into and discharges the valve cavity 100.

[0034] The first valve stem 2, the second valve stem 3 and the piston 4 of the filling valve of this embodiment are arranged in the valve cavity 100 and all move independently. The three work together to make the material enter the valve cavity 100 in an orderly manner and then be discharged from the valve cavity 100. The second valve stem 3 can prevent the material from leaking out of the valve cavity 100 and causing material waste, and prevent the filling machine from being contaminated. By controlling the first valve stem 2 and the second valve stem 3, the valve cavity 100 can be connected, which is convenient for the cleaning liquid to flush the valve cavity 100, so that the cleaning efficiency of the filling valve is high and the cleaning effect is good. Since the second valve stem 3 can extend out of the discharge port 120, after the piston 4 discharges the material, the second valve stem 3 can discharge the material that may remain at the discharge port 120 from the valve cavity 100 and fill it into the bottle. In particular, when the material is relatively viscous or contains particulate matter, the material is easy to remain, thereby further saving the material and preventing the residual material from falling and contaminating the machine.

[0035] Furthermore, the filling valve also includes a first cylinder 5, a second cylinder 6 and a third cylinder 7. The first cylinder 5 is connected to the first valve stem 2, the second cylinder 6 is connected to the second valve stem 3, and the third cylinder 7 is connected to the piston 4, thereby respectively driving the first valve stem 2, the second valve stem 3 and the piston 4 to perform reciprocating linear motion inside the valve body 1. The movements of the first valve stem 2, the second valve stem 3 and the piston 4 are all independently controlled, and their respective strokes can also be specifically adjusted according to actual needs to meet actual production needs.

[0036] Furthermore, the filling valve further includes a pressure relief mechanism 8, the third cylinder 7 is a double-shaft cylinder, one end of the cylinder shaft of the third cylinder 7 is connected to the piston 4, and the other end of the cylinder shaft of the third cylinder 7 is selectively abutted against the pressure relief mechanism 8, and the pressure relief mechanism 8 enables the piston 4 to continue to move a set distance after sucking in the material to expand the volume of the valve cavity 100. In the actual filling operation, after the piston 4 sucks the material into the valve cavity 100, the first valve stem 2 needs to be lowered to block the valve cavity 100, so that the piston 4 can press the material out from the discharge port 120. After the first valve stem 2 blocks the valve cavity 100, the material will be subjected to a large pressure in the valve cavity 100 due to being squeezed. When the second valve stem 3 is lifted, before the piston 4 squeezes the material, the material may be directly ejected from the discharge port 120 uncontrollably due to its own pressure, causing the filling operation to fail to proceed smoothly. By providing the pressure relief mechanism 8, the piston 4 can continue to move a set distance after sucking in the material to expand the volume of the valve chamber 100, thereby reducing the pressure on the material in the valve chamber 100. The material can only flow out of the discharge port 120 under the squeezing of the piston 4, so that the filling operation can be carried out controllably and smoothly.

[0037] Specifically, the pressure relief mechanism 8 includes a fourth cylinder 81, and the cylinder shaft of the fourth cylinder 81 selectively abuts against the cylinder shaft of the third cylinder 7. When the cylinder shaft of the third cylinder 7 contacts the cylinder shaft of the fourth cylinder 81, the cylinder shaft of the third cylinder 7 temporarily stops moving, so that the piston 4 connected thereto also temporarily stops moving. At this time, the material has been sucked out, and the first valve stem 2 will then block the valve cavity 100. After the first valve stem 2 blocks the valve cavity 100, the cylinder shaft of the fourth cylinder 81 will shrink, so that the cylinder shaft of the third cylinder 7 can continue to move for a distance, and the piston 4 will also continue to move for a distance, so that the volume of the valve cavity 100 increases, and the pressure on the material is released.

[0038] In this embodiment, a cushion 9 is provided on the cylinder shaft of the fourth cylinder 81, and the cushion 9 can prevent the cylinder shaft of the fourth cylinder 81 from rigidly colliding with the cylinder shaft of the third cylinder 7, thereby reducing the impact force and protecting the stability of the filling valve structure. Of course, the cushion 9 can also be provided on the cylinder shaft of the third cylinder 7.

[0039] Furthermore, the pressure relief mechanism 8 also includes an adjusting member 82, and the fourth cylinder 81 is fixed on the adjusting member 82. The adjusting member 82 is used to adjust the distance between the fourth cylinder 81 and the third cylinder 7, thereby adjusting the stroke of the piston 4 to adjust the material suction amount.

[0040] Preferably, a first sealing member 11 is sleeved on the first valve stem 2, and the first sealing member 11 can abut against the inner wall of the valve body 1 to achieve sealing. A second sealing member 12 is provided inside the valve body 1, and the second sealing member 12 is arranged near the discharge port 120. The second valve stem 3 can pass through the second sealing member 12, so that the second sealing member 12 is sleeved on the second valve stem 3. The valve cavity 100 can achieve good sealing by relying on the first sealing member 11 and the second sealing member 12, which can effectively prevent the material from leaking from the valve cavity 100, and ensure that the volume of the filled material is maintained within the required range.

[0041] like Figure 2 As shown, an embodiment of the present invention further provides a working method of a filling valve, comprising the following steps:

[0042] S1. The second valve stem 3 is in a state of blocking the valve cavity 100, and the first valve stem 2 is in a state of not blocking the valve cavity 100;

[0043] S2. The piston 4 moves, the volume of the valve chamber 100 increases, and the material is sucked into the valve chamber 100;

[0044] S3. The first valve stem 2 is in a state of blocking the valve cavity 100, and the second valve stem 3 is in a state of not blocking the valve cavity 100;

[0045] S4. The piston 4 moves in the opposite direction, the volume of the valve chamber 100 is reduced, and the material is pushed out of the valve chamber 100;

[0046] S5. Extend the second valve stem 3 out of the discharge port 120 to push out the remaining material at the discharge port 120 .

[0047] The working method of the filling valve of this embodiment is simple and reliable, and can reduce the waste of materials.

[0048] like Figure 3 As shown, further, in some embodiments, step S2 specifically includes the following steps:

[0049] S21. The third cylinder 7 drives the piston 4 to move, the volume of the valve chamber 100 increases, and the material is sucked into the valve chamber 100;

[0050] S22. The cylinder shaft of the third cylinder 7 abuts against the pressure relief mechanism 8, and the cylinder shaft of the third cylinder 7 and the piston 4 temporarily stop moving;

[0051] S23. The pressure relief mechanism 8 is activated, and the cylinder shaft and the piston 4 of the third cylinder 7 continue to move the set distance, the volume of the valve chamber 100 is further increased, and the pressure on the material in the valve chamber 100 is reduced.

[0052] The working method of the filling valve in the above embodiment can prevent the material from being ejected uncontrollably from the discharge port 120 due to excessive pressure, thereby avoiding material waste and contamination of the filling machine.

[0053] An embodiment of the present invention further provides a filling machine, comprising the filling valve of any of the above embodiments, thereby reducing waste of materials and facilitating cleaning.

[0054] As a preferred embodiment of the present invention, in the description of this specification, the description with reference to the term "preferred" or the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] The above embodiments are only used to illustrate the detailed scheme of the present invention, and the present invention is not limited to the above detailed scheme, that is, it does not mean that the present invention must rely on the above detailed scheme to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A filling valve, characterized in that: The invention comprises a valve body, a first valve stem, a second valve stem and a piston. The interior of the valve body is hollow to form a valve cavity. The valve cavity forms a feed port and a discharge port on the surface of the valve body. The first valve stem, the second valve stem and the piston are all movably arranged inside the valve body. The first valve stem is close to the feed port and can selectively block the valve cavity. The second valve stem is close to the discharge port and can selectively block the valve cavity. The second valve stem can extend out of the discharge port. The piston is arranged between the first valve stem and the second valve stem. The piston sucks materials into and discharges materials from the valve cavity. The filling valve further comprises a first cylinder, a second cylinder and a third cylinder, wherein the first cylinder is connected to the first valve stem, the second cylinder is connected to the second valve stem, and the third cylinder is connected to the piston; The filling valve also includes a pressure relief mechanism. The third cylinder is a double-shaft cylinder. One end of the cylinder shaft of the third cylinder is connected to the piston, and the other end of the cylinder shaft selectively abuts against the pressure relief mechanism. The pressure relief mechanism enables the piston to continue to move a set distance after sucking in the material to expand the volume of the valve chamber.

2. The filling valve according to claim 1, characterized in that: The pressure relief mechanism includes a fourth cylinder, and a cylinder shaft of the fourth cylinder selectively abuts against the cylinder shaft of the third cylinder.

3. The filling valve according to claim 2, characterized in that: A buffer pad is provided on the cylinder shaft of the fourth cylinder or the third cylinder.

4. The filling valve according to claim 2, characterized in that: The pressure relief mechanism further comprises an adjusting member, the fourth cylinder is fixed on the adjusting member, and the adjusting member is used to adjust the distance between the fourth cylinder and the third cylinder.

5. The filling valve according to claim 1, characterized in that: A first sealing member is sleeved on the first valve stem and can abut against the inner wall of the valve body to achieve sealing. A second sealing member is provided inside the valve body and is arranged close to the discharge port. The second valve stem can pass through the second sealing member so that the second sealing member is sleeved on the second valve stem.

6. A method for operating a filling valve according to any one of claims 1 to 5, characterized in that: The steps include: S1. The second valve stem is in a state of blocking the valve cavity, and the first valve stem is in a state of not blocking the valve cavity; S2. Make the piston move, the valve cavity volume increases, and the material is sucked into the valve cavity; S3. The first valve stem is in a state of blocking the valve cavity, and the second valve stem is in a state of not blocking the valve cavity; S4. The piston moves in the opposite direction, the volume of the valve cavity decreases, and the material is pushed out of the valve cavity; S5. Extend the second valve stem out of the discharge port to push out the remaining material at the discharge port; Step S2 specifically includes the following steps: S21. The third cylinder drives the piston to move, the valve chamber volume increases, and the material is sucked into the valve chamber; S22. The cylinder shaft of the third cylinder abuts against the pressure relief mechanism, and the cylinder shaft of the third cylinder and the piston temporarily stop moving; S23. The pressure relief mechanism is activated, the cylinder shaft of the third cylinder and the piston continue to move a set distance, the volume of the valve cavity is further increased, and the pressure on the material in the valve cavity is reduced.

7. A filling machine, characterized in that: The filling valve comprises the filling valve according to any one of claims 1 to 5.

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