Variable spiral conveying device

Abstract

The utility model relates to a variable spiral conveying device which comprises a spiral groove, a first spiral blade, a second spiral blade, a first driving mechanism and a second driving mechanism, and the first driving mechanism is used for driving the first spiral blade and the second spiral blade to rotate. And the second driving mechanism is used for driving the second spiral blade to move in the axial direction of the spiral groove relative to the first spiral blade, so that the conveying device has a first metering state and a second metering state, and in the first metering state, the second spiral blade is driven to move in the axial direction of the spiral groove. When the conveying device is in the first metering state, the first spiral blade is attached to the second spiral blade, and when the conveying device is in the second metering state, the second spiral blade is separated from the first spiral blade, so that the conveying device has a reduced spiral pitch, whether the metering state is switched or not can be freely selected according to different metering requirements, and the conveying device is convenient to use. The metering capacity and the metering precision are effectively considered, the structure is simple, the cost is low, and the reliability is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of metering, in particular to the field of screw conveying, and specifically relates to a variable screw conveying device. Background Art

[0002] At present, for the metering of powders, the spiral metering method is used in most occasions. Spiral metering itself is subject to many restrictive factors, such as: when the material needs to be changed, the originally designed spiral may no longer be applicable, and the change in capacity will be relatively large, especially for materials with large differences in fluidity, the accuracy and stability of measurement will be greatly reduced; for example, when there are high requirements for both the metering capacity and precision, in order to take into account the needs of metering capacity (especially when the metering capacity requirements are large), the screw selection is bound to be relatively large, which often results in insufficient metering accuracy or poor metering stability.

[0003] The general solutions to the above problems are: (1) Improving the applicability of the screw by adding external structures or components. (2) Replacing the existing unsuitable screw so that the new screw can match the physical properties of the new material. (3) Improving the capacity and metering accuracy of the screw through software control optimization. Regardless of the above solutions (1), (2), or (3), a valve is often installed at the discharge port to perform secondary interception of the material.

[0004] The solution (1) mentioned above is quite limited in its scope of application. One reason is that the design space is often limited, and there may not be additional space to install external structural parts or components. Even if it is possible, the cost is often high. Secondly, for some materials with good fluidity, the effect is often unsatisfactory. Therefore, this solution can often be regarded as a compensation for the "incompetence" of the existing screw, which is a temporary solution but not a fundamental solution. The solution (2) mentioned above directly replaces a screw suitable for the new material, which will take time to make, and the supporting devices may also need to be changed simultaneously, making such a "1 to 1" configuration difficult to operate in practice. Moreover, once the material properties change, it may become unsuitable. Obviously, the cost of manpower and material resources is huge. The solution (3) mentioned above can produce a certain optimization effect on the material metering capacity and metering accuracy through software optimization, but in general, when the screw itself does not match the existing material or the screw selection is too large, the improvement effect that can be achieved by software optimization is also limited. In most cases, it cannot solve this kind of problem well. Utility Model Content

[0005] In order to solve the above problems in the prior art, the utility model provides a variable screw conveying device, which can freely choose whether to switch the metering state according to different metering needs, effectively taking into account the metering capacity and metering accuracy, with simple structure, low cost and good reliability.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a variable spiral conveying device, whose main feature is that the device includes a spiral groove, a first spiral blade, a second spiral blade, a first driving mechanism, and a second driving mechanism. The first spiral blade and the second spiral blade are both arranged in the spiral groove. The first driving mechanism is used to drive the first spiral blade and the second spiral blade to rotate. The second driving mechanism drives the second spiral blade to move relative to the first spiral blade along the axial direction of the spiral groove by pushing the second spiral blade, so that the conveying device has a first metering state and a second metering state. In the first metering state, the first spiral blade and the second spiral blade are in contact with each other. In the second metering state, the second spiral blade is separated from the first spiral blade, so that the conveying device has a reduced spiral pitch. The second driving mechanism drives the movement of the second spiral blade to achieve the switching from the first metering state to the second metering state.

[0007] Preferably, the outer diameter of the first spiral blade is set to be larger than the outer diameter of the second spiral blade.

[0008] Preferably, the device includes a screw and a first fixed cylinder, the first end of the screw is sleeved in one end of the first fixed cylinder, and the first end of the screw is along the axial mounting hole of the screw, a guide rod is arranged in the first fixed cylinder, the guide rod is sleeved in the mounting hole, a directional sliding groove along the axial direction of the screw is arranged in the mounting hole, the guide rod is provided with a directional protrusion matching the directional sliding groove, so that the directional sliding groove can move along the directional protrusion, the other end of the first fixed cylinder is connected to the first driving mechanism through a coupling, the first spiral blade and the second spiral blade are both spirally arranged around the screw, one end of the first spiral blade is fixed on the first fixed cylinder, and the second spiral blade is fixed on the screw, the first driving mechanism drives the first spiral blade and the second spiral blade to rotate through the first fixed cylinder, and the second driving mechanism is used to drive the screw to move along the axial direction of the screw, so that the second spiral blade moves with the movement of the screw.

[0009] Preferably, the device includes a second fixed cylinder, the second end of the screw is sleeved in the second fixed cylinder and passes from one end of the fixed cylinder to the other end of the fixed cylinder, and the second driving mechanism drives the screw to move by pushing the second end of the screw.

[0010] Preferably, the other end of the first spiral blade is fixed on the second fixed cylinder.

[0011] Preferably, an air seal is provided between the first fixed cylinder and the first end of the screw rod, and between the second fixed cylinder and the second end of the screw rod.

[0012] Preferably, an elastic return member is arranged in the first fixed cylinder, one end of the elastic return member abuts against the first end of the screw, and the other end of the elastic return member abuts against the first fixed cylinder, and the automatic switching from the second metering state to the first metering state is achieved by the elastic force of the elastic return member.

[0013] Preferably, the first driving mechanism comprises a motor, and the second driving mechanism comprises a cylinder.

[0014] Preferably, the spiral groove is provided with a feed port and a discharge port, and the feed port is connected to the metering bin.

[0015] The beneficial effects of the variable screw conveyor of the utility model are:

[0016] When the material is supplied in large quantities, the first spiral blade and the second spiral blade are in a state of fitting together, which is equivalent to forming a large spiral, ensuring the maximum metering capacity. Only when entering the "small supply" stage, that is, the motor runs at a low frequency, the first spiral blade and the second spiral blade are automatically separated. At this time, the spiral pitch changes. The smaller the pitch, the higher the metering accuracy.

[0017] Simple structure and low cost;

[0018] It has a wide range of applications and can choose whether to open the first spiral blade and the second spiral blade according to different metering requirements;

[0019] Later disassembly and maintenance are more convenient;

[0020] The variable spiral blades can reciprocate and have the effect of simple bridge breaking and self-cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the variable screw conveying device of the utility model in the first metering state.

[0022] Figure 2It is a schematic structural diagram of the variable screw conveying device of the utility model in the second metering state. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0024] like Figure 1 and Figure 2 The figure shows a specific embodiment of the variable screw conveying device provided by the utility model. The device comprises a screw groove 2, wherein the screw groove 2 is provided with a feed port 14 and a discharge port 13, wherein the feed port 14 is connected to the metering bin 1, and the material in the metering bin 1 enters the screw groove 2 through the feed port 14, and is spirally conveyed by the spiral blades in the screw groove, and is discharged through the discharge port 13 with accurate measurement.

[0025] In an embodiment of the device of the utility model, the first spiral blade 3 and the second spiral blade 4 are included, and the first driving mechanism 10 and the second driving mechanism 11 are included. The first spiral blade 3 and the second spiral blade 4 are both arranged in the spiral groove 2. The first driving mechanism 10 is used to drive the first spiral blade 3 and the second spiral blade 4 to rotate. The second driving mechanism 11 drives the second spiral blade 4 to move relative to the first spiral blade 3 along the axial direction of the spiral groove 2 by pushing the second spiral blade 4, so that the conveying device has the following characteristics: Figure 1 The first metering state shown and Figure 2 The second metering state shown. The first drive mechanism includes a motor, and the second drive mechanism includes a cylinder, and is not limited to other components or methods that can play a similar role. Under normal conditions, the second drive mechanism 11 can be set to be disconnected from the second spiral blade 4, and the second spiral blade 4 is pushed and driven to move by direct contact through the extension of the cylinder.

[0026] In such Figure 1 In the first metering state shown, the first spiral blade 3 and the second spiral blade 4 are fitted together. In actual processing and manufacturing, a small and suitable gap is allowed between the first spiral blade 3 and the second spiral blade 4 when they are fitted together.

[0027] In such Figure 2 In the second metering state shown, the second spiral blade 4 is separated from the first spiral blade 3, so that the conveying device has a reduced spiral pitch. Compared with the spiral pitch in the first metering state, the spiral pitch in the second metering state is smaller. The first spiral blade 3 is fixed and cannot be moved, and the variable pitch is achieved by moving the second spiral blade.

[0028] In the device embodiment of the utility model, the second driving mechanism 11 drives the movement of the second spiral blade 4 to realize the switching from the first metering state to the second metering state.

[0029] The metering status can be switched at any time according to actual needs.

[0030] In the device embodiment of the utility model, the outer diameter of the first spiral blade 3 is set to be larger than the outer diameter of the second spiral blade 4. It can also be said that the first spiral blade 3 is a large spiral and the second spiral blade 4 is a small spiral.

[0031] In the device embodiment of the utility model, the device includes a screw 5 and a first fixed cylinder 6, the first end of the screw 5 is sleeved in one end of the first fixed cylinder 6, and the first end of the screw 5 is arranged in an axial mounting hole of the screw 5, a guide rod 7 is arranged in the first fixed cylinder 6, the guide rod 7 is sleeved in the mounting hole, a directional sliding groove along the axial direction of the screw 5 is arranged in the mounting hole, a guide rod is arranged in the first fixed cylinder 6, and a directional protrusion matching the directional sliding groove is arranged on the guide rod 7, so that the directional sliding groove can be moved along the directional protrusion, and the first The other end of a fixed cylinder 6 is connected to the first driving mechanism 10 through a coupling 9, the first spiral blade 3 and the second spiral blade 4 are both spirally arranged around the screw 5, the end of the first spiral blade 3 is fixed on the first fixed cylinder 6, the second spiral blade 4 is fixed on the screw 5, the first driving mechanism 10 drives the first spiral blade 3 and the second spiral blade 4 to rotate through the first fixed cylinder 6, and the second driving mechanism 11 is used to drive the screw 5 to move along the axial direction of the screw 5, so that the second spiral blade 4 moves with the movement of the screw 5. Among them, the second spiral blade 4 and the screw 5 are connected and fixed to each other to form an integral part.

[0032] The device includes a second fixed cylinder 12, the second end of the screw rod 5 is sleeved in the second fixed cylinder 12 and passes from one end of the fixed cylinder 12 to the other end of the fixed cylinder 12, and the second driving mechanism 11 drives the screw rod 5 to move by pushing the second end of the screw rod 5.

[0033] like Figure 1 As shown, the other end of the first spiral blade 3 is fixed on the second fixed cylinder 12, so that the first spiral blade 3 is connected and fixed to the first fixed cylinder 6 and the second fixed cylinder 12 respectively to form an integral part.

[0034] like Figure 2As shown, a first air seal 16 is provided between the first fixed cylinder 6 and the first end of the screw 5, and a second air seal 15 is provided between the second fixed cylinder 12 and the second end of the screw 5. The air seal is normally open to prevent material from getting stuck in the gap between the screw and the first fixed cylinder 6 and the gap between the screw and the second fixed cylinder 12. The sealing protection can be strengthened or the design can be changed according to the actual material conditions.

[0035] An elastic reset member 8 is arranged in the first fixed tube 6, one end of the elastic reset member 8 abuts against the first end of the screw rod 5, and the other end of the elastic reset member 8 abuts against the first fixed tube 6, and the elastic force of the elastic reset member 8 is used to realize the following Figure 2 The second metering state shown is as follows Figure 1 The elastic reset member 8 can be in the form of a spring or other elastic member that can provide elastic force. The specification of the spring can be changed to change the pitch size. Figure 2 As shown, in the second metering state, the second spiral blade 4 is separated from the first spiral blade 3, and the elastic reset member 8 is in a compressed state. The reciprocating motion of the second spiral blade 4 has the effect of breaking bridges and self-cleaning.

[0036] The utility model provides a typical working process of a variable screw conveyor:

[0037] The driving motor is turned on, and the first spiral blade and the second spiral blade are driven by the coupling to rotate at the same time. During the large supply metering process, the first spiral blade and the second spiral blade are in a state of being fitted together, that is, forming a "large spiral" state, which plays a role in the state of rapid metering and discharging;

[0038] When the drive motor enters the small supply state, the cylinder is turned on, and the second spiral blade is pushed to the right along the directional sliding groove, so that the first spiral blade and the second spiral blade are separated, achieving the effect of variable pitch;

[0039] When the small supply ends, the cylinder retracts the push rod, and the second spiral blade is pushed back by the action of the spring, and the first spiral blade and the second spiral blade are combined again to form a "large spiral" state.

[0040] The above steps are repeated repeatedly.

[0041] The beneficial effects of the variable screw conveyor of the utility model are:

[0042] When the material is supplied in large quantities, the first spiral blade and the second spiral blade are in a state of fitting together, which is equivalent to forming a large spiral, ensuring the maximum metering capacity. Only when entering the "small supply" stage, that is, the motor runs at a low frequency, the first spiral blade and the second spiral blade are automatically separated. At this time, the spiral pitch changes. The smaller the pitch, the higher the metering accuracy.

[0043] Simple structure and low cost;

[0044] It has a wide range of applications and can choose whether to open the first spiral blade and the second spiral blade according to different metering requirements;

[0045] Later disassembly and maintenance are more convenient;

[0046] The variable spiral blades can reciprocate and have the effect of simple bridge breaking and self-cleaning.

[0047] In this specification, the utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the utility model. Therefore, the description and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A variable screw conveying device, characterized in that: The device includes a spiral groove, a first spiral blade, a second spiral blade, a first driving mechanism, and a second driving mechanism. The first spiral blade and the second spiral blade are both arranged in the spiral groove. The first driving mechanism is used to drive the first spiral blade and the second spiral blade to rotate. The second driving mechanism drives the second spiral blade to move relative to the first spiral blade along the axial direction of the spiral groove by pushing the second spiral blade, so that the conveying device has a first metering state and a second metering state. In the first metering state, the first spiral blade and the second spiral blade are in contact with each other. In the second metering state, the second spiral blade is separated from the first spiral blade, so that the conveying device has a reduced spiral pitch. The second driving mechanism drives the movement of the second spiral blade to achieve the switching from the first metering state to the second metering state.

2. The variable screw conveying device according to claim 1, characterized in that: The outer diameter of the first spiral blade is set to be larger than the outer diameter of the second spiral blade.

3. The variable screw conveying device according to claim 1, characterized in that: The device comprises a screw and a first fixed cylinder, the first end of the screw is sleeved in one end of the first fixed cylinder, and the first end of the screw is provided with a mounting hole along the axial direction of the screw, a guide rod is provided in the first fixed cylinder, the guide rod is sleeved in the mounting hole, a directional sliding groove along the axial direction of the screw is provided in the mounting hole, the guide rod is provided with a directional protrusion matching the directional sliding groove, so that the directional sliding groove can move along the directional protrusion, the other end of the first fixed cylinder is connected to the first driving mechanism through a coupling, the first spiral blade and the second spiral blade are both spirally arranged around the screw, one end of the first spiral blade is fixed on the first fixed cylinder, and the second spiral blade is fixed on the screw, the first driving mechanism drives the first spiral blade and the second spiral blade to rotate through the first fixed cylinder, and the second driving mechanism is used to drive the screw to move along the axial direction of the screw, so that the second spiral blade moves with the movement of the screw.

4. The variable screw conveying device according to claim 3, characterized in that: The device comprises a second fixed cylinder, the second end of the screw is sleeved in the second fixed cylinder and passes from one end of the fixed cylinder to the other end of the fixed cylinder, and the second driving mechanism drives the screw to move by pushing the second end of the screw.

5. The variable screw conveying device according to claim 4, characterized in that: An air seal is provided between the first fixed cylinder and the first end of the screw rod, and between the second fixed cylinder and the second end of the screw rod.

6. The variable screw conveying device according to claim 4, characterized in that: The other end of the first spiral blade is fixed on the second fixed cylinder.

7. The variable screw conveying device according to claim 3, characterized in that: An elastic reset member is arranged in the first fixed cylinder, one end of the elastic reset member abuts against the first end of the screw, and the other end of the elastic reset member abuts against the first fixed cylinder, and the automatic switching from the second metering state to the first metering state is achieved by the elastic force of the elastic reset member.

8. The variable screw conveying device according to any one of claims 1 to 7, characterized in that: The first driving mechanism includes a motor, and the second driving mechanism includes a cylinder.

9. The variable screw conveying device according to any one of claims 1 to 7, characterized in that: The spiral groove is provided with a feed port and a discharge port, and the feed port is connected with the metering bin.

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