JPH0716481A - Tension device of jaw crusher - Google Patents

Abstract

PURPOSE:To make the adjustment of a tension device of a jaw crusher easy by fitting a holder to a suitable place of a screwed part from a long groove, operating a hydraulic jack fitted to a receiving base of the holder, extending the hydraulic jack to presse the back surface of a retainer, and allowing the energizing force of a compression spring to be eliminated. CONSTITUTION:In front of a retainer 3 for two tension rods 1 arranged parallel with each other are fitted compression springs 2 compressing it. The rear parts of the tension rods 1 passing through the retainer 3 are made to be screwed parts 11A. etc., screwed into adjusting nuts 4. In the front of a holder 5 where long grooves 51 in which the two parallel screwed parts 11A, etc., are fitted with clearance are cut off at prescribed places, are projectingly formed receiving bases 52 to and from which hydraulic jacks 6 moving forwards and backwards are freely attached and detached. As a result, a tension device of a jaw crusher is easily adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension device for restraining swing of a swing jaw of a jaw crusher.

[0002]

2. Description of the Related Art As shown in FIG. 3, a jaw crusher has a crushing chamber 8 having a V-shaped cross section formed by a fixed tooth 81 attached to a front frame 71 and a moving tooth 82 attached to a swing jaw 83. Is connected to the rear frame 72 by the toggle mechanism 9.
There are several types of toggle mechanism, but basically,
As shown in the figure, one end of the toggle plate 91 engages with the rear portion of the swing jaw 83, and the other end engages with the toggle block 92, so that the swing jaw swings due to the rotational movement of the swing jaw eccentric shaft 84 therebetween. I support you. In this case, when the lower end of the swing jaw moves backward to move the bottom of the V-shaped crushing chamber 8 in the opening direction, the swing jaw and the toggle plate may be disconnected as they are, so the toggle plate is always disconnected. Needs to be pressed against the toggle sheet 93. For this reason, the tension rod 1a is provided and urged so that the lower end of the swing jaw 83 is always tensioned rearward.

The urging force that tensions rearward is the spring 2a provided around the tension rod. Because of this urging force, it is always pulled rearward with a constant tension, so that the connection state between the toggle plate and the toggle sheet is maintained, and the swinging movement can be continued without the swing jaws coming off. . Then, when it becomes necessary to adjust the crushing chamber outlet gap due to wear of the surfaces of the moving teeth and the fixed teeth, the adjusting nut 4a screwed with the threaded portion 11a threaded at the rear end of the tension rod 1a is rotated. The tension force of the tension rod is varied to adjust the swinging rear end position of the swing jaw (the discharge outlet gap of the crushed material).

The jaw crusher is a device for crushing rocks, which are objects to be crushed, between fixed teeth and moving teeth by crushing them.
It goes without saying that the compressive force is extremely strong. Therefore, since the load applied to the tension rod connected to the rear in order to restrain the swing of the swing jaw and continue the motion is also large, the compression strength of the spring that constantly tensions the tension rod must also be large. I have to. In the structure as shown in FIG. 3, it is necessary to rotate the adjusting nut against the urging force of the strong spring, which requires a very large rotation moment, and the delicate rotation of the screw causes the exit of the crushing chamber to go out. Adjustment is not an easy task, and as a result, it cannot be said that there is no omission in proper product grain size control.

FIG. 4 is one of the prior arts which takes note of this point and has been proposed as Japanese Utility Model Publication No. 59-33473. That is, as shown in the drawing, the pressure adjusting plate 3b positioned by the adjusting nut 4b screwed to the end of the tension rod 1b.
Is a device for adjusting the compression force of a spring 2b mounted between a fixed plate fixed to the body frame and a cylinder mounting plate 5b screwed to a tension rod 1b, and fixed vertically to this plate. It is characterized by comprising two or more hydraulic cylinders 6b for pressing the pressure regulating plate 3b. Due to this configuration, when it becomes necessary to rotate the adjusting nut or when the spring itself is replaced, the two hydraulic cylinders are operated to press the pressure adjusting plate 3b to push back the compression force of the spring 2b, and the adjusting nut It is said that the effect of being able to freely rotate the nut by canceling the biasing force applied to the nut was obtained.

[0006]

As in the structure of this prior art, when the urging force of the compression spring applied to the adjusting nut is pushed back by the operation of the hydraulic cylinder to neutralize it and the adjusting nut is rotated, the adjusting nut is adjusted. After adjustment of the nuts, if the hydraulic cylinder mounting plate and the hydraulic cylinders mounted on it are not removed from the jaw crusher and operation is started as is, vibration of the jaw crusher may damage the hydraulic cylinder or tension rod There is a concern that the threaded portion may be damaged, and in some cases, the tension rod itself may vibrate and enter an abnormal operating state, which may lead to failure of the device itself.

Considering this prior art from that point, the cylinder mounting plate 5b is attached to the threaded portion 11b of the tension rod.
However, it is extremely difficult to screw and remove a fairly large and heavy mounting plate into and from the threaded portion of the tension rod that is housed in the narrow space near the bottom of the jaw crusher. It is a work, and it must be said that it is a laborious and difficult work. Moreover, according to this embodiment of the prior art, each tension rod requires a cylinder mounting plate.
The plate is divided into a plurality of pieces, and the work of individually attaching and detaching them is very troublesome. Since the two cylinders are attached and detached integrally with each of the divided mounting plates with the two cylinders still attached, the structure is complicated, the operation is complicated, time is wasted, workability is low, and the overall operating efficiency of the jaw crusher is low. There is a great risk that it will lead to a decrease in

In order to solve the above problems, the present invention is very easy to attach and detach to and from the jaw crusher. During normal operation, the jaws are detached from the device and easily attached only when adjustment is necessary, and the adjustment nut is attached. The purpose is to provide a tensioning device for a jaw crusher that can rotate without resistance.

[0009]

A tensioning device for a jaw crusher according to the present invention forms a crushing chamber having a V-shaped cross section with a fixed tooth fixed to a front frame and a moving tooth attached to a swing jaw. The rear frame of the swing jaw is connected by a toggle mechanism, and the rear ends of the swing jaws are tensioned by a tension rod. Two tension rods 1 arranged in parallel are pressed against the front surface of the retainer 3 by compression. A spring 2 is provided, and a rear surface penetrating the retainer is composed of a screw portion 11 that is screwed with an adjusting nut 4 that determines the position of the retainer, and is freely detachable at desired positions on the two parallel screw portions 11A and 11B. The above-described problem is solved by providing the holder 5 notched with the longitudinally long groove 51 to be fitted with a mounting portion into which the hydraulic jack 6 which moves forward and backward is fitted.

In this basic structure, the setting of the position of the holder 5 is such that the rear spine is supported by the auxiliary nut 12 screwed to the threaded portions 11A and 11B of the tension rod, and the hydraulic jack 6 can be attached to and detached from the holder 5. It is a very preferable embodiment that the holder 5 is fitted into a cylindrical pedestal 52 that projects to the front surface and has a notch opened over the entire length of the upper portion.

[0011]

The compression spring 2 is provided on the front surface of the retainer 3 to tension the tension rod. The position of the retainer is adjusted by advancing and retracting the adjusting nut 4 which is screwed with the threaded portion 11 of the tension rod on the rear surface. Normally, the operation is performed in this state, but if the outlet gap of the crushing chamber expands due to the wear of the tooth plate and the discharged product particle size starts to deviate from the standard, it is necessary to immediately adjust the outlet interval. That is, the operation of the jaw crusher is stopped and the adjusting nut is rotated, but at this time, the holder 5 is set in the vertical direction and fitted from above the tension rods. The holder 5 is provided with a longitudinal long groove 51, and the two long grooves are opened at the same pitch so that they can be commonly inserted into the two tension rods.
The holder is positioned by sliding the outer circumference of the tension rod onto the side surface of the long groove and fitting it. The position of the holder relative to the retainer can be appropriately performed as in the embodiment described later, but the desired position is to press the retainer when the tip of the hydraulic jack fitted on the front surface of the holder extends. The requirement is that the compression screw can be pushed back.

Before or after covering the tension rod with the holder, the hydraulic jack is fitted to the front surface of the holder. Since it is set so that the attachment / detachment of the hydraulic cylinder to / from the holder can be completed very easily in one operation, when the hydraulic jack is operated on the holder that is fitted in the specified position,
The tip of the hydraulic jack extends to press the rear surface of the retainer 3 to push back the compression spring on the front surface, and the biasing force on the adjusting nut 4 disappears, so that the nut can be easily rotated.

When a desired crushing chamber outlet gap is formed by turning the adjusting nut, the tip of the hydraulic jack is contracted to restore the biasing force of the compression spring to the retainer, and the holder is pulled out vertically upward as it is. Adjustment of the tensioning device and removal of the adjustment jig can be completed with one touch, and the regular crushing work can be started immediately.

[0014]

FIG. 1 is a perspective view showing an embodiment of the present invention,
2A and 2B are a plan view and a front view of the same embodiment. Although an overall view of the jaw crusher itself is omitted in each drawing, a V-shaped crushing chamber is formed by the fixed teeth attached to the front frame and the moving teeth attached to the swing jaw, and the V-shaped crushing chamber is supplied from the upper raw material supply section. The basic mechanism of crushing the crushed object by crushing it between both teeth and recovering it as a product from the bottom discharge part is the same as that shown in FIG.

Two tension rods 1 are provided in parallel, and the front ends thereof are rotatably connected to the rear ends of swing jaws (not shown). Compression spring 2 around the rear end
The through hole 31 formed in the retainer 3 is loosely fitted into the retainer 3 to form the threaded portion 11, which is projected to the rear portion. The adjusting nut 4 is screwed into the threaded portion 11, and the position of the nut determines the position of the retainer, and the compression force urging the tension rod is determined. Auxiliary nuts 12A and 12B are screwed into the two screw portions 11A and 11B which are projected in parallel to the rear surface at the same distance from the rear surface of the retainer. When the holder is fitted into the front of the auxiliary nut (on the left side in FIG. 1) from above, the nut serves as a stopper and the holder cannot be retracted from this position, and the position is determined.

Since normally two tension rods are provided, it is preferable to use two hydraulic jacks to evenly press the retainer from the holder. That is, as shown in the figure, a cylindrical pedestal 5 having a notched upper part on the front surface of the holder
2 is attached so as to project inside the long groove, and the hydraulic jack is fitted into this mounting base from above. Since the upper part of the pedestal is cut out over the entire length, there is an advantage that even if a flexible oil supply pipe is connected to the hydraulic jack, it can be easily attached and detached without any trouble in its fitting.

[0017]

As described above, according to the present invention, the clearance between the product discharge ports of the jaw crusher can be easily adjusted, and once the adjustment is completed, the jig used for the adjustment is immediately removed so that the operation is not hindered. Can be planned. In this way, the tensioning device's adjustment jig can be freely attached and removed, so it is possible to maintain the appropriate conditions of the crushing chamber in a desirable state frequently without the need for complicated manual work as in the past, and the convenience of this maintenance is granular. This will lead to the effect of being one of the reasons for always ensuring high-quality products with uniform quality.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a plan view (A) and a front view (B) of the same embodiment.

FIG. 3 is a front view showing an example of a conventional technique.

FIG. 4 is a plan view showing another conventional technique.

[Explanation of symbols] 1 tension rod 2 compression spring 3 retainer 4 adjustment nut 5 holder 6 hydraulic jack 9 toggle mechanism 8 crushing chamber 11 screw part 12 auxiliary nut 51 long groove 52 cradle 71 front frame 72 rear frame 81 fixed teeth 82 moving teeth 83 Swing jaw 84 Eccentric shaft 91 Toggle plate 92 Toggle block 93 Toggle seat

Claims (3)

[Claims] 1. A crushing chamber having a V-shaped cross section is formed by a fixed tooth fixed to a front frame and a moving tooth attached to a swing jaw, and the swing jaw and the rear frame are connected by a toggle mechanism. In a jaw crusher tensioning device that tensions the rear end with a tension rod, a compression spring 2 that presses the retainer 3 of two tension rods 1 arranged in parallel is provided on the front surface of the retainer 3, and the rear portion that penetrates the retainer is a retainer. Adjustment nut 4 that determines the position
The holder 5, which is formed by a threaded portion 11 that is screwed with, is provided with a longitudinally long groove 51 notched so that it can be freely detachably fitted to a desired position on the two parallel threaded portions 11A and 11B. A tensioning device for a jaw crusher, which is equipped with a mounting portion into which the hydraulic jack 6 is fitted. 2. The tensioning device for a jaw crusher according to claim 1, wherein the setting of the position of the holder 5 is supported by an auxiliary nut 12 screwed into the screw portions 11A and 11B. 3. Attaching and detaching the hydraulic jack 6 to and from the holder 5
A tensioning device for a jaw crusher characterized by being fitted into a cylindrical pedestal 52 projecting to the front surface of the holder 5 and having a notch opened over the entire length.