Accurate liquid adding device capable of avoiding residues

Abstract

The utility model discloses a residue-avoiding accurate liquid adding device, which comprises a base, a core rod, a liquid inlet pipe joint and an air blowing pipe joint, a through hole corresponding to the core rod is horizontally arranged in the base, the core rod is arranged in the through hole, a blind hole is arranged on the outer circle of the core rod in a radially concave manner, and the air blowing pipe joint is arranged in the blind hole. A liquid inlet hole which is communicated with the through hole and corresponds to the blind hole is concavely formed in the top of the base, a liquid outlet hole which is communicated with the through hole and is concentric with the liquid inlet hole is concavely formed in the bottom of the base, and a first blowing hole which extends in the axial direction of the core rod is formed in the blind hole; the tail end of the first air blowing hole is provided with a second air blowing hole extending to the outer circle of the core rod in the radial direction of the core rod, and the base is internally provided with a third air blowing hole communicating with the through hole and corresponding to the second air blowing hole. According to the precise liquid adding device capable of avoiding residues, liquid residues in the blind hole can be removed through compressed air, and the control precision of the adding amount of liquid raw materials is improved.

Description

Technical Field

[0001] The utility model relates to the field of polyurethane adhesive processing equipment, in particular to a precise liquid adding device for avoiding residue. Background Art

[0002] In the processing of polyurethane adhesive, multiple raw materials need to be introduced into the mixing box in sequence to mix and react the raw materials to obtain an emulsion. In order to ensure the production qualification rate of polyurethane adhesive, the addition order and amount of each raw material need to be strictly controlled.

[0003] Liquid raw materials can be added by using a metering pump, which often uses the movement of the plunger to suck in and discharge the liquid in the pump chamber, thereby achieving metered addition and regulation of the liquid raw materials. The structure is relatively complex, and there will be an indefinite amount of residual liquid in the pump chamber each time it is discharged, resulting in inaccurate control of the addition amount, which needs to be improved. Utility Model Content

[0004] The utility model aims to provide a precise liquid adding device which can avoid residue, add liquid raw materials and improve the control accuracy of the added amount.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A precise liquid-adding device for avoiding residue, comprising: a base, a core rod, a liquid inlet pipe joint and an air blowing pipe joint, wherein a through hole corresponding to the core rod is horizontally arranged in the base, the core rod is arranged in the through hole, a blind hole is radially concavely arranged on the outer circle of the core rod, a liquid inlet hole connected to the through hole and corresponding to the blind hole is concavely arranged on the top of the base, the liquid inlet pipe joint is arranged on the top of the liquid inlet hole, a liquid outlet hole connected to the through hole and concentric with the liquid inlet hole is concavely arranged on the bottom of the base, a first air blowing hole extending axially along the core rod is arranged in the blind hole, a second air blowing hole extending radially along the core rod to the outer circle of the core rod is arranged at the end of the first air blowing hole, a third air blowing hole connected to the through hole and corresponding to the second air hole is arranged in the base, and the air blowing pipe joint is arranged at the outer end of the third air blowing hole.

[0007] Wherein, a rotation driving mechanism for driving the core rod to rotate is arranged on the back side of the base.

[0008] Wherein, the rotation drive mechanism adopts a motor.

[0009] Wherein, when the blind hole is concentric with the liquid outlet hole as the core rod rotates, the second air blowing hole is communicated with the third air blowing hole.

[0010] Wherein, when the blind hole becomes concentric with the liquid inlet hole as the core rod rotates, the second blowing hole and the third blowing hole are misaligned.

[0011] Wherein, a one-way valve is arranged in the second air blowing hole or the first air blowing hole.

[0012] The beneficial effects of the utility model include: a precise liquid adding device for avoiding residue, which can introduce the liquid in the liquid inlet hole into the blind hole through the rotation of the core rod, and quantitatively transfer it to the liquid outlet hole for discharge through the blind hole, so as to facilitate the addition of liquid raw materials for the production of polyurethane adhesives, and in the process of transferring the liquid in the blind hole to the liquid outlet hole, compressed air can be used to enter the blind hole through the third blowing hole, the second blowing hole and the first blowing hole in sequence to remove the liquid residue in the blind hole, thereby improving the control accuracy of the amount of liquid raw material added. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the top view structure of the utility model;

[0014] Figure 2 yes Figure 1 AA section view;

[0015] Figure 3 yes Figure 2 Schematic diagram of the structure after the core rod is rotated 180 degrees. DETAILED DESCRIPTION

[0016] Combine the following Figures 1 to 3 The technical solution of the utility model is further illustrated by specific embodiments.

[0017] like Figure 1 and Figure 2 The precise liquid adding device for avoiding residue shown includes: a base 1, a core rod 2, a liquid inlet pipe joint 3 and an air blowing pipe joint 5, wherein the base 1 is horizontally provided with a through hole 12 corresponding to the core rod 2, and the core rod 2 is arranged in the through hole 12, and the outer diameter of the core rod 2 matches the inner diameter of the through hole 12, and the fit is tight.

[0018] A rotation drive mechanism 9 for driving the core rod 2 to rotate is provided on the back of the base 1. In this embodiment, the rotation drive mechanism 9 adopts a motor, and the number of rotations of the rotation drive mechanism 9 can be controlled by PLC to achieve control of the amount of liquid raw material added and the timing of addition.

[0019] A blind hole 7 is radially concavely provided on the outer circle of the core rod 2, and a liquid inlet hole 4 communicating with the through hole and corresponding to the blind hole 7 is concavely provided on the top of the base 1, and the liquid inlet pipe joint 3 is arranged on the top of the liquid inlet hole 4. Figure 3 As shown, the liquid inlet pipe joint 3 is externally connected to the liquid inlet pipe, which can introduce the liquid raw material into the blind hole 7. The volume of the blind hole 7 is used to measure the amount of liquid raw material added during a single rotation of the core rod 2. By controlling the number of rotations of the core rod 2, the addition of the liquid raw material can be completed.

[0020] A liquid outlet hole 8 connected to the through hole and concentric with the liquid inlet hole 4 is provided in the bottom of the base. Figure 2 As shown, when the blind hole 7 is rotated to be connected with the liquid outlet hole 8, the liquid raw material can be introduced into the liquid outlet hole 8 and flow into the reaction container of the polyurethane adhesive through the liquid outlet hole 8.

[0021] like Figure 1 and Figure 2 As shown, a first blowing hole 6 extending axially along the core rod 2 is provided in the blind hole 7, a second blowing hole 10 extending radially along the core rod 2 to the outer circle of the core rod 2 is provided at the end of the first blowing hole 6, a third blowing hole 11 connected with the through hole 12 and corresponding to the second blowing hole 10 is provided in the base 1, and the blowing pipe joint 5 is provided at the outer end of the third blowing hole 11, and the blowing pipe joint 5 is externally connected to a compressed air pipeline to deliver compressed air into the third blowing hole 11.

[0022] like Figure 2 As shown, when the blind hole 7 is concentric with the liquid outlet hole 8 as the core rod 2 rotates, the second air hole 10 is connected with the third air hole 11, and the compressed air enters the blind hole 7 through the third air hole 11, the second air hole 10 and the first air hole 6 in sequence to remove the liquid residue in the blind hole 7, which is beneficial to improve the accuracy of adding liquid raw materials.

[0023] like Figure 3 As shown, when the blind hole 7 is concentric with the liquid inlet hole 4 as the core rod 2 rotates, the second air hole 10 and the third air hole 11 are misaligned, and the liquid inlet hole 4 introduces the liquid raw material into the blind hole 7. In this embodiment, a one-way valve 13 is provided in the second air hole 10 or the first air hole 6, which can prevent the liquid raw material from entering the first air hole 6, and allow compressed air to enter the blind hole 7 through the second air hole 10 and the first air hole 6, thereby improving the safety of the air path.

[0024] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A precise liquid adding device for avoiding residue, characterized in that: include: A base, a core rod, a liquid inlet pipe joint and an air blowing pipe joint, wherein a through hole corresponding to the core rod is horizontally arranged in the base, the core rod is arranged in the through hole, a blind hole is radially concavely arranged on the outer circle of the core rod, a liquid inlet hole connected to the through hole and corresponding to the blind hole is concavely arranged on the top of the base, the liquid inlet pipe joint is arranged on the top of the liquid inlet hole, a liquid outlet hole connected to the through hole and concentric with the liquid inlet hole is concavely arranged at the bottom of the base, a first air blowing hole extending axially along the core rod is arranged in the blind hole, a second air blowing hole extending radially along the core rod to the outer circle of the core rod is arranged at the end of the first air blowing hole, a third air blowing hole connected to the through hole and corresponding to the second air hole is arranged in the base, and the air blowing pipe joint is arranged at the outer end of the third air blowing hole.

2. The precise liquid adding device for avoiding residue according to claim 1, characterized in that: A rotation driving mechanism for driving the core rod to rotate is arranged on the back side of the base.

3. The precise liquid adding device for avoiding residue according to claim 2, characterized in that: The rotary drive mechanism adopts a motor.

4. The precise liquid adding device for avoiding residue according to claim 1, characterized in that: When the blind hole becomes concentric with the liquid outlet hole as the core rod rotates, the second air blowing hole is communicated with the third air blowing hole.

5. The precise liquid adding device for avoiding residue according to claim 4, characterized in that: When the blind hole becomes concentric with the liquid inlet hole as the core rod rotates, the second air blowing hole is misaligned with the third air blowing hole.

6. The precise liquid adding device for avoiding residue according to claim 1, characterized in that: A one-way valve is arranged in the second air blowing hole or the first air blowing hole.

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