JPH0631830U - Small amount dispenser for liquid chemicals - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a small amount discharge device for liquids or the like that enables accurate discharge of an arbitrary amount of liquids with high viscosity and is easy to refill and easy to operate. [Structure] A container 3 such as a liquid agent whose volume is changed by an external pressure is arranged in a pressurizing chamber, and a pressurized liquid 21 is supplied to the pressurizing chamber by pumps 4 and 12 to compress the container 3, It is a minute amount discharge device for liquid agent or the like which is connected to the container 3 and discharges a minute amount of the liquid agent or the like from the discharge tube 9. The pumps 4 and 12 are of a cylinder type, and the discharge ports of the pumps 4 and 12 are vertically arranged so that the pressurizing chambers face upward so that the pressurizing chambers communicate with each other. The wall 2 of the pressure chamber can be transparent.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an improvement of a device that continuously discharges and supplies a fixed amount of a liquid such as an adhesive or a necessary chemical (hereinafter referred to as a liquid) for adhering or fixing parts in the process of manufacturing mass-produced products. Regarding

[0002]

[Problems to be solved by conventional techniques and devices]

 The inventors of the present application filed an application for the invention of "a small amount discharge device for liquid agent" on August 25, 1992. An embodiment of a micro-dispensing device for a liquid agent or the like according to the above application will be briefly described with reference to FIG. A liquid agent container filled with a liquid agent to be discharged and the volume of which is reduced by an external pressure is housed in a pressurized container a. A pressurized liquid that pressurizes the liquid agent container is connected to the container a via a transportation tube b. The discharge tube c is connected to the joint portion d between the liquid container and the pressure container a. Then, the discharge tube c is drawn out from the pressurized container a and guides the liquid agent and the like to the outside. The pressurized liquid is filled in the tank e and is connected to the pump g by the transport tube f, and the pump g delivers the pressurized liquid to the arbitrary amount and sends it to the pressurized container a. As a result, the liquid agent container in the pressure vessel a is pushed to reduce the volume, and the liquid agent inside is discharged from the discharge tube c. As a result of various experiments conducted on the apparatus having such a structure, in the case of a low-viscosity liquid agent, there is almost no problem, but when the high-viscosity liquid agent is discharged, the pressurized container a and the pressurized liquid are delivered. It has been found that there is a problem with the tube b or the like used for connection with the pump g. In order to discharge a high-viscosity liquid agent, the pressure vessel a and the tube b that conveys the pressurized liquid cannot sufficiently withstand this pressure and are liable to change in volume. In addition, even when bubbles are present in the pressurized liquid, the volume change due to the compression of the bubbles affects the ejection accuracy. An object of the present invention is to solve the above problems and to provide an accurate amount of highly viscous liquid agent or the like, and to provide a small amount of liquid agent or the like that is easy to refill and has good operability. is there.

[0003]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the device for dispensing a small amount of liquid agent or the like according to the present invention arranges a container for liquid agent or the like, the volume of which is changed by external pressure, in the pressurizing chamber, and pressurizes the liquid in the pressurizing chamber by a pump. In a small amount discharge device for discharging a liquid agent or the like from a discharge tube connected to the container to compress a small amount of the liquid agent or the like. The discharge port of the pump is vertically arranged so as to communicate with the pressurizing chamber. The wall of the pressure chamber can be made of a transparent material so that the inside of the pressure chamber can be observed.

[0004]

【Example】

 Hereinafter, an embodiment of a small amount dispensing device for liquids according to the present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view of an embodiment of a micro-dispensing device for a liquid agent or the like according to the present invention, which is partially broken to show the internal structure. FIG. 2 is an enlarged view of the connecting portion of the liquid agent container, the discharge tube, and the pressure container of the apparatus of the above embodiment. Supports 8A and 8B are planted on the table 20, and a cylindrical pump cylinder 12 of a pump for delivering a liquid for pressurization is fixed to the upper ends of the supports 8A and 8B. The transparent wall 2 of the pressure vessel is securely connected to the upper end of the pump cylinder 12 via an O-ring 11. On the transparent wall 2 of the pressurized container, a lid assembly including a lid 17, a stop valve 1 and a discharge tube 9 is detachably arranged via an O-ring 10 (see FIG. 2). A pulley 14B and a feed screw (female) 5 provided integrally with the pulley 14B are integrally rotatably supported between the pump cylinder 2 and the shelf 19. A pulse motor 15 is fixed to the shelf 19, and a timing belt 13 is provided between a pulley 14A fixed to the output shaft of the motor 15 and the pulley 14B. The feed screw 7 is screwed to the drive screw 5, and the tip of the screw 5 is provided with a cylinder head having an O-ring 4 for a cylinder. The O-ring 4 is in sliding contact with the inner circumference of the pump cylinder 12 in a secret manner. The lower end of the feed screw 7 is fixed to a plate 18 with a nut 7a, and the both ends of the plate 7 are loosely fitted in the holes corresponding to the columns 8A and 8B, respectively. Limit sensors 6A and 6B that detect a movement limit and generate a signal are arranged on the shelf 19 and the base 20 in association with the plate 18.

The pulse motor 15 is controlled by the motor control circuit 30 shown in FIG. The flip-flop 31 is set by a one-shot input, and a set pulse is sent to a clock generator 32 for one shot and a 3-digit preset counter 33. The 3-digit preset counter 33 is preset by the 3-digit thumb rotary switch 34, counts the clock from the clock generator 32 for one shot, and resets the flip-flop 31 when the set value is reached. At this time, the operation of the clock generator 32 for one shot is also stopped. The decoder 37 determines the rotation direction of the motor 15 based on the selection signal from the discharge suction clock 35, and drives the motor 15 by the driver 38 based on the clock from the clock generator 32. Thus, the motor control circuit 30 can drive the motor 15 in any direction and by any amount.

(Preparation Work and Discharge) About half of the pressurizing container 21 is filled with the pressurizing liquid 21 (water in this embodiment) with the lid 17 removed. It is not necessary to fill the liquid container 3 with half of the liquid liquid for discharge, and leave the rest inflated with air, because the liquid is compressed by the liquid pressure when it is placed in the liquid for pressurization and the air is pushed out. . As shown in FIG. 2, the stopper 16 and the tube 9 are attached to the lid 17, and further fixed to the pressure vessel 2 via the O-ring 10. The stop valve 1 is opened to fill the pressurized container 2 with water. When the pulse motor 15 is started, rotation of the pulse motor is caused to rotate the feed screw 5 for driving through the timing belt 13, and the feed screw 7 is moved upward. As a result, the cylinder 4 of the pump moves upward, pushing up the water in the pressurized container to the position of the stop valve 1, and in this state, the stop valve 1 is closed. If the water in the pressure tank 2 is continuously pressurized by the rotation of the pulse motor 15 with the stop valve 1 kept closed, the liquid agent container 3 is compressed and the air inside the container 3 is discharged through the discharge tube 9. When the insides of the container 3 and the tube 9 are filled with the liquid agent, the pulse motor 15 is reversely rotated and the feed screw 7 is lowered with the tip of the tube 9 inserted in the liquid agent tank (raw material tank). The cylinder 4 also descends to generate a negative pressure in the pressurizing tank 2, and the liquid agent for discharge is sucked into the discharge liquid supply tank 3 to fill the supply tank. This completes the set. After that, a predetermined amount of liquid agent can be discharged by rotating the motor by a preset amount, and the liquid agent or the like can be replenished as described above.

[0007]

[Effect of device]

 As described in detail above, the device for ejecting a small amount of a liquid agent or the like according to the present invention creates a bubble by combining a pressurized container and a pressurized liquid delivery pump unit integrally with each other to eliminate a connecting liquid transport unit and further by constructing vertically. The conventional problem could be completely solved by reducing the number as much as possible. By integrating the pressurizing pump and the pressurizing container as in the above structure, eliminating the connecting tube and increasing the rigidity, the discharge volume can be stabilized and the response can be improved, enabling high-pressure delivery. . As a result, we were able to achieve highly accurate ejection of even highly viscous liquids. Further, by increasing the diameter of the pressurizing cylinder of the pump, it is possible to discharge a highly viscous material, and by decreasing the diameter, it is possible to discharge a small amount with high accuracy. This makes it possible to further improve viscosity compatibility simply by changing the cylinder pump while keeping most of the members common. By arranging the arrangement of the pressurizing cylinder and the pressurizing container on a straight line in the vertical direction, it is possible to minimize the portion where bubbles are accumulated. By making the member of the pressure vessel transparent, it is possible to easily confirm the air bleeding state and the consumption state of the liquid agent and the like.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a micro-dispensing device for a liquid agent or the like according to the present invention, which is partially broken to show an internal structure.

FIG. 2 is an enlarged front view showing a connection portion of the liquid agent container, the discharge tube, and the pressure container of the apparatus of the embodiment.

FIG. 3 is a block diagram showing a motor control circuit.

FIG. 4 is a perspective view of a micro-dispensing device for a liquid agent or the like according to the above proposal.

[Explanation of symbols]

 1 Stop valve 2 Pressurized tank 3 Liquid container 4 Packing 5 Drive screw 6A, 6B Limit sensor 7 Feed screw 8A, 8B Strut 9 Discharge tube 10, 11 Ong 12 Pump cylinder 13 Timing belt 14 Pulley 15 Pulse motor 16 Stopper 17 Lid 18 plates 19 shelves 20 units 30 motor control circuit

Claims (2)

[Scope of utility model registration request] 1. A container for a liquid agent or the like, the volume of which is changed by an external pressure, is placed in a pressurizing chamber, a pressurized liquid is supplied to the pressurizing chamber by a pump to compress the container, and the container is connected to the container. In a minute amount discharging device for discharging a small amount of liquid agent or the like from a discharge tube, the pump is a cylinder type so that the pressurizing chamber faces upward and the discharge port of the pump communicates with the pressurizing chamber. A small amount discharge device for liquid agents or the like characterized by being arranged vertically. 2. The small amount discharge device for liquid agent or the like according to claim 1, wherein the wall of the pressurizing chamber is transparent.