JPH0315154Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic PC steel bar unbonding coating machine that automatically applies an unbonding agent to a PC steel bar used in post-tension prestressed concrete members.

[Conventional technology]

PC steel rods used in relatively small post-tensioned prestressed concrete members such as sleepers are coated with an unbonding agent on their surfaces to prevent them from adhering to concrete, and then prestressed after the concrete hardens.

Conventionally, the application of unbonding agent to PC steel bars was done manually, but there is a need to advance automation from the viewpoints of work efficiency, safety and health, etc., and the applicant has already developed an automatic unbonding application machine for PC steel bars. This has been disclosed and has gained fame from all quarters. (Refer to Japanese Patent Application No. 58-066010 and Japanese Unexamined Patent Publication No. 59-189962) [Problems to be solved by the invention] The present invention is a device for achieving the same purpose as disclosed above, and is further developed. The purpose of this invention is to provide an automatic coating machine for unbonding PC steel bars, which is especially suitable for mass production.

[Means for solving problems]

In order to achieve the above object, the present invention has the following features. That is, an endless chain conveyor that supports the vicinity of both ends of the PC steel bar and moves it horizontally, a device that applies an unbonding agent to the moving PC steel bar, and a machine that transfers the PC steel bar one lot at a time from above the chain conveyor. a conveyor for carrying out, a multi-stage rack for receiving the PC steel rod from the conveyor and transferring it to a drying room, and mutual operation of all the devices;
This is an automatic unbonding coating machine for PC steel bars that is equipped with a control device that coordinates stops and controls sequences.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. Figure 1 is a side view of the present invention, Figure 2 is a plan view,
Figure 3 is a front view, Figure 4 is an enlarged view of section A in Figure 3,
FIG. 5 is an enlarged view of part B in FIG. 3.

The present invention consists of the following parts: (1) a chain conveyor 10 that supports the vicinity of both ends of the prestressed steel bars and moves horizontally; (2) an unbonding agent applicator 20; and (3) one lot of prestressed steel bars from the chain conveyor. It is constructed by organically combining a conveyor 30 that lifts upward and moves horizontally, (4) a rack 40, and (5) a control device 50.

The chain conveyor 10 has sprockets 11,1
This horizontal chain conveyor is driven by a motor 14 and includes a pair of left and right chains 13 suspended endlessly between two chains 13. An attachment 15 is attached to the chain 13 of the chain conveyor 10, and the attachment 15 is provided with a recess 16 for supporting and transporting the PC steel bar 1.

The PC steel bars 1 are fed horizontally onto the chain conveyor 10 from the direction of the arrow 3 while being inserted into the anchor plate 2 in sets of two, with both ends supported by the recesses 16 of the left and right chain attachments 15. and transported horizontally.

It is preferable to provide appropriate guide rails in order to align the left and right positions of the PC steel bars on the chain and to align the widths of the PC steel bars on the chain as necessary.

The unbonding agent application device 20 is disposed in the middle of the travel path of the chain conveyor 10. The unbonding agent application device 20 includes an unbonding agent storage tank 21 whose top surface is open, a pump 22 that suctions and pressurizes the unbonding agent from this storage tank 21, and an injection pipe 2 that sprays the pressurized unbonding agent from above the PC steel rod.
3, and a brush 24 for wiping away excess unbonding agent adhering to the PC steel rod. The unbonding agent storage tank 21 is provided with a heating device 25 for keeping the unbonding agent at an appropriate viscosity, and although not shown, there is a heating device 25 above the unbonding agent storage tank 21 that sucks the vapor of the unbonding agent and its solvent. It is equipped with a hood to prevent these from scattering into the air, a suction hose from the hood, an induction fan, and an unbonding agent recovery device.

The unbonding agent sprayed uniformly from the injection pipe 23 and applied to the PC steel rod is wiped away by the brush 24, and the excess unbonding agent is automatically returned to the storage tank 21, so that the unbonding agent is applied to the PC steel rod. The unbonding agent is thinly coated, and the unbonding agent does not drip off the PC steel rod that has passed through the coating device 20.

If a plurality of brushes 24 are provided so as to be swingable, and rotation is applied to the PC steel rod using a fixed friction plate or the like, wiping can be more effectively performed.

The PC steel rod coated with the unbonding agent while being continuously conveyed in this manner is removed from the chain conveyor 10 by the conveyor 30. Conveyor 30
The frame 31 is erected in the rear half of the chain conveyor 10 in the running direction, and is slightly wider than the chain conveyor 10, and the chain conveyor 10 lifts one batch of, for example, 20 PC steel bars that have been horizontally transported. A rod 32, a transport rail 33 for horizontally traveling this moving rod 32, and this transport rail 3
3 and a drive device 34 that raises and lowers the

As illustrated in FIG. 4, the moving rod 32 is a horizontal rod disposed slightly outside the chain 13 of the chain conveyor 10 and parallel to the chain 13, and has four wheels at each end thereof. 35, and these wheels are engaged with the upper and lower edges of the transport rail 35 so as to be horizontally movable. The movable rod 32 has a large number of
It supports both ends of the PC steel bar and lifts it from the chain conveyor 10 at once.

The conveyor rail 33 moves up and down along the pillars of the frame 31 accompanied by the moving rod 32, and during this upward movement, the moving rod 32 supports the tips of both ends of the PC steel bar 1 on the chain conveyor 10 and moves the PC steel bar 1. Lifting (Fig. 4,
(See Figure 5). The timing of this lifting is controlled by a limit switch.
When the number of steel bars is aligned on the moving rod 32, the chain conveyor 10 is temporarily stopped.

When the conveyor rail 33 rises to a predetermined position, it is stopped by a limit switch, and then the moving rod 32 is moved across the conveyor rail by the rolls 35 to place the PC steel bars on each stage of the rack 40.

The rack 40 includes a large number of horizontal bars 41 in the form of shelves,
It is equipped with wheels 42 and is pushed into the frame 31 of the conveyor 30 so that it can be loaded and removed freely, and receives each batch of PC steel bars from the conveyor 30 and places them on the shelves one by one from above, until the shelves are full. When it becomes dry, it is transferred to a drying room.

For example, this rack 40 is a total of 20 pieces per tier x 10 tiers.
Can load 200 PC steel bars.

The chain conveyor 10, coating device 20, conveyor 30, and rack 40 described above are automatically operated by a series of sequence controls, and the control device 50 controls them.

[Effect]

The device of the present invention is operated by the control device 50 as follows. First, when you turn on the main switch, the power indicator lamp lights up. Next, turn on the main breaker in the control panel, sequence breaker, each travel motor breaker, and if necessary, the heater breaker.

Next, securely set the rack 40 in place. This set position is automatically confirmed by the limit switch.

Next, confirm that the lifting rail and moving rod of the transport device are in their original position, that is, in the state immediately before lifting the PC steel bar. Normally, it should have stopped at this original position at the end of the previous operation, but if it is in another position, it must be returned to the original position manually.

Press the operation button to start the device.

Through the above operations, the apparatus of the present invention operates under sequence control as follows.

The unbonding agent pump 22 is activated and begins spraying.

The chain conveyor 10 is started and the PC steel rod 1 is sent horizontally.

The PC steel rods 1 are coated with an unbonding agent, wiped with a brush 24, and moved one after another, with the first steel rod being applied to the discharge side sprocket 11 of the chain conveyor 10.
When reaching a certain position nearby, a limit switch is activated to temporarily stop the chain conveyor 10,
At the same time, the conveying device 30 starts to rise and lifts one lot, for example, 20 PC steel bars. When the PC steel rod is slightly lifted from the chain conveyor 10, the chain conveyor 10 is restarted.

The conveying device 30 stops when it rises to the height of the highest stage of the rack 40, and the moving rod 32 moves in the direction of the rack along the conveying rail 33, and places the PC steel bar on the highest crosspiece of the rack. Move to the position and stop. Then immediately move the transport rail 3
3 descends together with the moving rod 32. By this lowering, the PC steel bar is placed on the top rack.

When the transport rail descends to the lowest level and stops, the moving rod moves horizontally and returns to its original position.

When the next leading steel rod reaches a certain position near the discharge side sprocket 11 of the chain conveyor 10, the above operation returns and the above steps are repeated.
However, the lifting of the conveying device 30 should be done when the rack 40 is already lifted.
It stops when it rises to a position one level below the level on which the PC steel bar is placed.

Thus, when all stages of rack 40 are full, all operations cease.

When the rack 40 is replaced with another empty rack, the device is started up again and the above operation is automatically repeated.
Note that when the automatic operation is restarted after stopping or emergency stopping, the operation from the time of stopping of the above sequence continues to proceed.

Of course, the device of the present invention can also be operated entirely manually.

[Effect of idea]

The unbonding agent applicator of this invention automatically applies unbonding agent to PC steel bars while continuously moving them horizontally on a chain conveyor.
Since PC steel rods are stored one after another in a rack, the operating operations of all devices can be matched and sequenced at high speed, and large processing capacity can be easily provided. For example, for sleepers
800 in the unbonding agent application process for PC steel bars.
A device of this capacity per hour can be easily fabricated. The device of the present invention has excellent effects such as labor saving, improving occupational safety and health, improving work efficiency, and reducing costs.

[Brief explanation of the drawing]

The figures show an embodiment of the invention, with Figure 1 being a side view;
Figure 2 is a plan view, Figure 3 is a front view, Figure 4 is a third
FIG. 5 is a detailed view of part A in the figure, and FIG. 5 is a detailed view of part B in FIG. 1...PC steel material, 2...Anchor plate, 3
...Arrow, 10...Chain conveyor, 11, 12
... Sprocket, 13 ... Chain, 14 ... Motor, 15 ... Attachment, 16 ... Recess,
20... Unbonding agent application device, 21... Storage tank,
22... Pump, 23... Injection pipe, 24... Brush, 25... Heating device, 30... Conveyor, 31...
...Frame, 32...Moving rod, 33...Transportation rail, 40...Rack, 41...Horizontal bar, 42...Wheel, 50...Control device.

Claims (1)

[Scope of utility model registration request] An endless chain conveyor that supports the vicinity of both ends of a PC steel bar and moves it horizontally; a device that applies an unbonding agent to the moving PC steel bar;
a conveyor that carries out the steel rods one by one from the chain conveyor; and a conveyor that receives the PC steel rods from the conveyor;
It is characterized by being equipped with a multi-stage rack for transferring this to a drying chamber, and a control device that coordinates the mutual operation and stopping of all the devices and controls the sequence.
Automatic unbonding machine for PC steel bars.