JPH0126535Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pushchair dog for transporting objects on a chain conveyor that continuously transports carts and the like.

[Conventional technology]

A pusher dog for a chain conveyor is composed of a rear claw that pushes the transported object and a front claw that prevents the transported object from running away. The structure of conventional pushchair dogs can be roughly divided into the following two types depending on the transfer method of conveyed objects. One type, as shown in FIG. 6, is a type in which the front claw 1 is retractable, and the front claw 1 is rotatably supported on a chain conveyor 2 via a shaft 3, so that the load of the transported object 4 can be reduced. As shown by the solid line, in a state where the pusher dog is not moving, the center of gravity is set in the direction in which the front claw 1 rises due to its own weight, and as the push dog moves in the P direction, the conveyed object 4 moves toward 4a, 4a, 4b, 4
Move relatively to position c, and press front claw 1 at position 4b.
rotates clockwise and falls down, and at position 4c, the front claw 1
The conveyed object 4 was designed to fit between the rear claw 5 and the rear claw 5.

Another method is to use the front claw 1 as shown in Figure 7.
and a rear claw 5 are fixed to the chain conveyor 2, and the height of the rear claw 5 is higher than that of the front claw 1. , the conveyed object 4 is transported by the rear claw 5.
As the chain conveyor 2 moves in the P direction, the rear claw 5 advances while pushing the conveyed object 4, and the chain level gradually rises until it reaches the front claw 1 at the position shown in b. This is a system in which the conveyed object 4 is engaged, held between the front claw 1 and the rear claw 5, and caused to advance together with the conveyor 2.

As an improved version of the above two systems, the structure shown in FIG. 5 has been proposed in Utility Application No. 59-093493 filed by the same applicant. As shown in FIG.
The shape of the engagement surface that comes into contact with the conveyed object via the pusher plate 8 is a cylindrical surface centered on the rotation center 9 of the front claw 6 for the front claw 6, and an engagement surface for the rear claw 7. Side roller shaft 1 of the chain roller, which is the center of rotation when the chain is floating, is located at the bottom of the surface.
The lower jaw has a cylindrical surface centered at 0.

[Problem that the invention attempts to solve]

In the case of the first method shown in FIG. 6 above,
Since the engagement surface with the conveyed object 4 is formed as a substantially perpendicular plane for both the front claw 1 and the rear claw 5, when the conveyed object 4 is transferred to the push-ya dog, when the fallen front claw 1 rises, the conveyed object 4 and Escape allowance between front claw 1
l ₁ is required to be at least 20 mm, and this clearance becomes play in the conveyed object 4 within the dog, causing speed fluctuations during conveyance.

In addition, in the case of the second method shown in FIG.
If l ₂ between the conveyed object 4 and the front claw 1 shown in is small,
When the conveyed object 4 moves from the position a to the position b, it may ride on the front claw 1 as shown in c due to chain waving or the like. Therefore, the distance 〓l ₂ between Pushyadog and conveyed object 4 is usually
About 40mm was secured. This also caused speed fluctuations of the conveyed object 4, as in the case of the first method.

Speed fluctuations during the conveyance of the conveyed object 4 by the chain conveyor 2 occur due to the above-mentioned gap between the pusher dog and the conveyed object 4, between the chain and the chain rail, and the waving of the chain itself. Nowadays, the work content of production lines that perform work on conveyed objects during production lines is becoming more elaborate and automated, and this fluctuation in the speed of conveyed objects can reduce work efficiency and become an obstacle to work automation. There was a problem.

According to the improved type shown in Fig. 5, the distance between the conveyed object and the pusher dog can be significantly reduced, but due to variations in finishing accuracy during manufacture of the pusher dog and wear during use, There was a problem that the gap between the conveyor and the conveyed object fluctuated.

The present invention solves these problems, minimizes the distance between the pusher dog and the conveyed object, and suppresses speed fluctuations of the conveyed object during conveyance, regardless of the manufacturing accuracy of the pusher dog or wear during use. The purpose of the present invention is to provide a pusher dog for a chain conveyor.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a pusher plate that automatically engages with a pusher plate provided on the carrier to pull the carrier. In a pusher dog for a chain conveyor, which is provided with a front claw and a rear claw having an engagement surface that comes into close contact with the pusher plate, the front claw is moved in the direction of conveyor movement via a slide plate on the chain cover of the chain conveyor. A front claw adjustment means is provided which supports the slide plate slidably and moves the slide plate to adjust the position of the front claw.

[Effect]

According to the above configuration, even if there is a variation in the distance between the pusher dog and the pusher plate due to errors in finishing accuracy during manufacturing or wear during use, this distance can be minimized by simple adjustment. I can do it.

〔Example〕

The present invention will be explained in detail below based on illustrated embodiments.

An embodiment of the present invention is shown in FIGS. 1 to 4. In the figure, the pusher dog is composed of a front claw 6 and a rear claw 7. These front claws 6 and back claws 7
are each rotatably attached to a bracket 12 via a pin 11, and this pin 11 is prevented from coming off by a split pin 13. The center of gravity of both the front pawl 6 and the rear pawl 7 is formed in the direction in which the pawls rise due to their own weight, and these dead weights are supported by a stopper 15 fixed to the chain cover 14. The bracket 12 is directly fixed to the chain cover 14 on the side of the rear claw 7, but on the side of the front claw 6, the bracket 12 is fixed to the slide plate 16.
is slidably attached to the chain cover 14 with bolts 18 through elongated holes 17 formed in the slide plate 16. This bolt 18 is screwed into a screw hole formed in the chain cover 14. The left and right sides of the slide plate 16 are held between guide bars 19 fixed to the chain cover 14, and a stopper block 20 is fixed to the rear end. An adjuster bolt 21 is brought into contact with this stopper block 20, and this adjuster bolt 21 is screwed into a screw formed in a block 22 fixed to the chain cover 14, and is secured by a double nut 23. It is set up. Here, stopper block 20, block 22,
The adjuster bolt 21 constitutes a front pawl adjustment means for adjusting the position of the front pawl.

The chain cover 14 is fixed to the chain link 24, and the lower part of the chain link 24 is divided into two parts, with a center pin bush 25 in the middle and flanged side rollers 26 on both sides coaxially. The chain link 24 can be rotated freely.
The side rollers 26 are supported by the lower forked portion of the chain rail 27 . Between the front pawl 6 and the rear pawl 7 is a part 8 for pulling the conveyed object, which is usually called a pusher plate, and this pusher plate 8 is attached to the main body of the cart as shown in FIG. 4 as an example of the conveyed object. It is fixed to a frame 28, and a mounting 29 is provided on the upper surface of the frame 28, and wheels 30 are provided on the lower surface. For example, a car body 31 is placed on this mounting 29, and wheels 30
is guided by the rail 32 and the bogie body frame 28
It is now used to transport.

The shape of the engagement surface of the front claw 6 is a cylindrical curved surface 6a having a radius R1 centered on the pin 11, which is the center of rotation of the front claw ₆ , and engages with the pusher plate 8. ing. Further, a cylindrical lower jaw 7b having a radius R ₂ centered on the rotation center of the side roller 10 is formed below the engagement surface 7a of the rear claw 7 with the pusher plate 8.

Next, the operation of the above embodiment will be explained.

The motion of the chain is transmitted to the rear pawl 7 via the chain link 24, chain cover 14, bracket 12, and pin 11 in order, and is further transmitted to the pusher plate 8 via the vertical engagement surface 7a of the rear pawl 7. Ru. The front claw 6 is designed to prevent objects from escaping during transportation.
It functions to hold the pusher plate 8 between the rear claw 7 and the rear claw 7. Here, the normal relative position between the rear claw 7 and the pusher plate 8 is the position shown by the solid line in FIG. 5, but since there is a gap between the roller 26 and the rail 27, the pusher plate 8 is When an external force is applied to the rear pawl 7 through the roller 26, the rear pawl 7 rotates about the shaft 10 of the roller 26 and is raised to the position A shown by the double chain line. At that time, if the pusher plate 8 moves while maintaining its relative position with the rear claw 7, the pusher plate 8 will be pulled up to the position B shown by the double chain line, but this does not mean that the conveyed object itself This is impossible in reality because it would involve lifting the . Or even if it happens, the pusher plate 8 quickly slides down from position B to the normal position shown by the solid line. That is, the pusher plate 8 does not move from the position indicated by the solid line. This shows that the position of the conveyed object is always constant without being affected by the distance between the rollers 26 and the rails 27.

When the pusher plate 8 enters from the front of the pusher dog, that is, from the left side in FIG. When it falls down until it reaches the position shown by the solid line, it hits the rear claw 7. At the same time, the front claw 6 rises from position D to the position shown by the solid line, but since the contact surface 6a with the pusher plate 8 is a cylindrical surface centered on the pin 9, the front claw 6 and the pusher remain in contact with each other even after rising. The space between it and the shear plate 8 does not widen. That is, since both the rear claw 7 and the front claw 6 are always in contact with the pusher plate 8, it has become possible to minimize the play of the conveyed object in the pusher dog. Furthermore, if the gap between the pusher plate 8 and the front claw 6 and rear claw 7 widens due to wear of various parts during use or errors in finishing accuracy during manufacturing, the chain to which the front claw 6 is attached may The slide plate 16 provided on the cover 14 is inserted into the bolt 1 within the range of the elongated hole 17 formed in the slide plate 16.
By loosening 8 and sliding it, the distance between the front claw 6 and the pusher plate 8 can be adjusted.
can again be minimized. After adjustment, the bolts 18 are tightened again to fix the slide plate 16 to the chain cover 14. However, in order to prevent the slide plate 16 from shifting due to impact applied to the front pawl 6 in the front and back direction, the stopper block 20 is tightened again.
Push the adjuster bolt 21 onto and secure it with the double nut 23.

As described above, it has become possible to significantly reduce speed fluctuations of the conveyed object during continuous conveyance, making it easier for automatic equipment to follow the conveyed object, promoting automation and improving work efficiency. In addition, the investment for modification is small, and the reliability of the transfer of the pusher plate and the life of the pusher dog as a whole are improved.Moreover, the pusher plate, front claws, and rear claws can be damaged due to errors in finishing accuracy during pusher dog manufacture or wear during use. The distance between the nail and the nail can be easily adjusted to the minimum.

[Effect of idea]

As detailed above, according to the present invention, the engagement surfaces of the front and rear claws of the pusher dog for a chain conveyor with the pusher plate are made cylindrical, and the front and rear claws and the pusher plate are formed in a cylindrical shape. A front claw adjustment means is provided to adjust the distance between the front claw and the pusher plate by moving the front claw, so the distance between the front claw and rear claw and the pusher plate can always be kept to a minimum with simple adjustment.
Fluctuations in the conveyance speed of the conveyed object can be kept extremely small.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of a pusher dog for a chain conveyor according to the present invention, Fig. 2 is a partial sectional view seen from the side of Fig. 1, and Fig. 3 is a plan view showing the front claw of Fig. 1. , FIG. 4 is a schematic diagram showing a state in which a cart is towed by a chain conveyor, FIG. 5 is an operation diagram of a pusher dog, and FIGS. 6 and 7 are operation diagrams of a conventional pusher dog. 1, 6...Front claw, 2...Chain conveyor, 5,
7... Rear claw, 8... Pushsha plate, 12...
Bracket, 14...Chain cover, 16...Slide plate, 17...Elongated hole, 21...Adjustment bolt, 24...Chain link, 26...Side roller, 27...Chain rail.

Claims (1)

[Scope of utility model registration request] An engagement surface for pushing the pusher plate provided on the transport vehicle, and a rear pawl formed at the bottom of the engagement surface with a cylindrical lower jaw portion centered on the chain roller, which is the center of rotation when the chain lifts up. and a front pawl formed with an engaging surface that comes into contact with the pusher plate, and the engaging surface of the front pawl is formed in a cylindrical shape centered on the center of rotation of the front pawl. In the pusher dog, the rear claw is rotatably supported on a chain cover of a chain roller,
The front claw is rotatably supported on a slide plate, the slide plate is attached so as to be able to slide in the direction of movement of the carrier, and the engagement surface of the front claw and the engagement surface of the rear claw are connected to each other. A pushchair dog for a chain conveyor, characterized in that a front claw adjustment means is provided for adjusting the interval between the two by moving the slide plate.