JPS6246434Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to a tension rod spring adjustment device, and in particular, for example, adjustment of a spring attached to a tension rod for pulling the swing jaw of a jaw clamp in a certain direction. Regarding equipment.

``Prior Art'' Conventionally, this type of tension rod spring adjusting device has been disclosed in, for example, Japanese Utility Model Publication No. 59-33473. Particularly, in this conventional adjustment device shown in Fig. 1 A (see Fig. 3 attached to this application) in the same publication, Fig. ), the hydraulic cylinders 23a, 23 attached to the jack plate 24 (cylinder mounting plate)
Piston rods 26a, 26b depending on the operation of b.
is pushed out, and the piston rods 26a, 26
The spring seat plate 18 (pressure adjustment plate) is pressed by b.
is pushed out in the direction of arrow 27 in the figure. In response, the spring 20 attached to the tension rod 16 is compressed. Meanwhile, spring 2
A strong biasing force of 0 is received by the jack plate 24 via the spring seat plate 18.
The pressing force of the spring seat plate 18 against the adjusting nut 17 screwed onto the threaded portion 22 of the tension rod 16 is eliminated. Therefore, this adjustment nut 1
7 can be turned with little force and tightened or loosened to any desired position. And this adjustment nut 17
is moved to the specified position, the spring seat plate 1
The pressing force of the piston rods 26a and 26b pushing the spring 20 is gradually weakened, and as the spring 20 is restored, the spring seat plate 18 is moved to the adjustment nut 17.
Move until it touches. In this way, an appropriate compression length of the spring 20 can be obtained and the desired compression force can be adjusted. As shown in FIG. 3, the spring 20 causes the tension rod 16 to properly pull the lower end of the swing jaw 3 of the jaw crusher backward at all times, in the direction in which the swing jaw 3 releases the raw material, i.e., in the direction indicated by the arrow 15.
Even when swinging in the opposite direction, the toggle seat 6
The connection is prevented from being disconnected from the toggle sheet 8 or the like.

"Problems to be Solved by the Invention" In such a conventional adjustment device, the spring seat plate 18 is pressed on the jack plate 24 side against the urging force of the strong spring 20, thereby Since the structure is such that the compressive force of the spring 20 is adjusted, the biasing force of the spring and the pressing force of the jack plate 24 collide with each other across the spring seat plate 18. In this case, there is no problem as long as the biasing force of these springs and the pressing force on the jack plate 24 side are uniformly applied to the spring seat plate 18. However, the tension rod 16
However, the spring 2 is always strongly compressed.
It is extremely rare for the spring 20 to be located at the center of 0, and it is also difficult to install the spring 20 in that way from the beginning. Therefore, the biasing force of the spring 20 is normally applied unevenly to the spring seat plate 18, and the spring seat plate 18 is inclined, for example, as shown by the dashed line in FIG. In this case, the tension rod through hole 18a of the spring seat plate 18 is
At the insertion opening 18a', insert the tension rod 16.
A problem arose in that the threaded portion 22 of the screw was rubbed, damaging the thread and hindering subsequent adjustment work.

``Purpose of the invention'' Therefore, the main purpose of this invention is to protect the threaded part of the tension rod from the spring seat plate and improve workability even if the biasing force of the spring is not applied uniformly to the spring seat plate. An object of the present invention is to provide an adjustment device for a tension rod spring.

``Means for Solving the Problems'' In order to achieve the above object, the main means adopted by this invention are an adjustment nut screwed onto the threaded portion of the tension rod, and an adjustment nut that is passed through the tension rod and attached to the adjustment nut. Therefore, a tension rod spring adjusting device is provided with a spring seat plate that is appropriately positioned in the axial direction, and the compressive force of the spring attached to the tension rod is adjusted by the moving position of the spring seat plate. A protrusion inserted between the tension rod and the spring seat plate is formed on one side of the adjustment nut, and the spring seat plate is supported by the protrusion at a constant distance from the tension rod. This is the point.

``Operation'' When the spring seat plate slidably inserted into the tension rod is pushed toward the spring,
A biased spring biasing force is applied to this spring seat plate. At this time, if the spring seat plate loses its balance and begins to tilt, the protrusion of the adjustment nut interposed between the tension rod and the spring seat plate prevents this, and the tension rod and the spring seat plate are placed between the spring seat plate and the spring seat plate. The constant spacing formed is maintained.

``Effect of the invention'' According to this invention, even if the biasing force of the spring is biased against the spring seat plate, a constant distance is formed between the spring and the tension rod.
The threaded portion of the tension rod can be reliably protected from the spring seat plate without tilting the spring seat plate, making it possible to efficiently perform operations such as adjusting the compression force of the spring.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

Embodiment FIG. 1 is a sectional side view of a main part of an apparatus according to an embodiment of this invention. Note that the following example is only one specific example of this invention, and the technical scope of this invention is not limited by this example. Also,
Elements common to those of the conventional tension rod spring adjusting device shown in FIG. 2 will be described using the same reference numerals.

In FIG. 1, a tension rod spring adjusting device A includes a tension rod 16 that horizontally passes through a fixing plate 19 fixed to a main body frame (not shown), and has an insertion hole formed in the fixing plate 19. 20 is slidably inserted through the hole. A threaded portion 22 having a predetermined length is formed at the end of the tension rod 16 in the axial direction thereof.

This threaded portion 22 is a portion on which a spring seat plate 32, which is appropriately positioned depending on the screwing position of an adjusting nut 30 screwed therein, moves over a certain length. And this spring seat plate 32
Similar to the conventional one, the spring 20, which is attached to the tension rod 16, is held in a compressed state between the tension rod 16 and the fixing plate 19 in cooperation with the fixing plate 19 mentioned above.

A through hole 32a having a diameter larger than the diameter of the tension rod 16 is formed approximately in the center of the spring seat plate 32. Therefore, a certain gap B is formed between the spring seat plate 32 and the tension rod 16, and the protrusion formed on the adjustment nut 30 is inserted into this gap B. 30a is inserted. Note that the protrusion 30a is a so-called sleeve, and the protrusion 30a is connected to the threaded portion 22.
It may be formed into a cylindrical body with a female thread that is screwed into the male thread of the body, or it may be a rod-shaped body which is suitably divided. However, the protruding portion 30a is formed to correspond to the shape of the gap B so that the spring seat plate 32 loosely inserted into the threaded portion 22 can be evenly supported in the gap B. In this preferred embodiment, the gap B is formed in a tapered shape that widens toward the entrance 32a of the spring seat plate 32, and the protrusion 30a
It is also formed in an inversely tapered shape that narrows toward the tip. In this way, by forming the protrusion 30a and the gap B in a tapered shape that corresponds to each other, it becomes easy to insert the protrusion 30a into the gap B, and in particular, the tension rod 16 can be easily inserted into the gap B. This makes it easier to set the center of the axis.

Further, a jack plate 34 is attached to the threaded portion 22 for pressing the spring seat plate 32 toward the above-mentioned fixing plate 19 against the biasing force of the spring 20. However, this jack plate 34 is attached around a cap 36 for protecting the thread of the threaded part 22, and this cap 36 has a cap 36 for locking the jack plate 34 to the threaded part 22. A locking nut 36 is formed. This jack plate 34 is equipped with a piston rod 26 as in the conventional device.
The hydraulic cylinder 2 is moved so that a and 26b come into contact with the surface of the spring seat plate 32 depending on the extent to which they advance.
3a and 23b are attached.

Next, the function of the tension rod spring adjusting device having such a configuration will be explained.
First, in FIG. 1, hydraulic cylinders 23a, 2
3b, the piston rods 26a, 26
When b is pushed out and moved from the jack plate 32 fixed at the position shown in FIG. is pushed out in the direction of the fixed plate 19. Then, for example, due to the biasing forces of the hydraulic cylinders 23a and 23b becoming unbalanced, the spring seat plate 32
Trying to fall down. On the other hand, since the protrusion 30a of the adjustment nut 30 is inserted into the gap B formed between the spring seat plate 32 and the tension rod 16 and tightened, the protrusion 30a of the adjustment nut 30 is inserted into the gap B.
Since 0a acts as a filler, this spring seat plate 32 does not tilt. Therefore, on the thread of the prey part 22,
The spring seat plate 32 no longer comes into contact with each other.

In the above embodiments, the case where the piston rod is driven by a hydraulic cylinder or the like has been described. However, it is also possible to replace this piston rod portion with a screw or the like that is manually tightened.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional view of the main part showing an embodiment of the device of this invention, Fig. 2 is an explanatory view showing a conventional tension rod spring adjustment device which is the background of this invention, and Fig. 3 is a sectional view of a conventional tension rod spring adjustment device. FIG. 3 is a schematic side sectional view of the jaw crusher. Explanation of symbols, A...Tension rod spring adjustment device, B...Gap, 16...Tension rod, 22...Threaded portion, 30...Adjusting nut,
30a...Protrusion, 32...Spring seat plate, 3
4... Jyatsuki plate.

Claims (1)

[Claims for Utility Model Registration] An adjustment nut screwed onto a threaded portion of a tension rod, and a spring seat plate penetrated by the tension rod and positioned appropriately in the axial direction by the adjustment nut. In a tension rod spring adjusting device in which the compression force of a spring attached to the tension rod is adjusted by the moving position of a plate, an intervening device is provided between the tension rod and the spring seat plate on one side of the adjustment nut. 1. A tension rod spring adjustment device, characterized in that a protrusion is formed to be inserted, and the spring seat plate is supported by the protrusion at a constant distance from the tension rod.