HK1182359B - Device for a hydraulic hammer - Google Patents

Description

Device for a hydraulic hammer

Technical Field

The present invention relates to a device for a hydraulic hammer, and more particularly to a device by which surroundings can be protected from damage.

Background

Hydraulically operated impact devices, hydraulic hammers, shovels (hoeram), rock crushers, hydraulic impact hammers, all of which are tool names that have been in history for over 50 years. Today, numerous hammers are known and their use is quite widespread. The hydraulic hammer is usually connected to the boom of the excavator, and the hydraulic pressure of the excavator is in turn connected to the hydraulic hammer by means of a suitable hose.

Hydraulic hammers are used, for example, in excavation work to break up frost-bound soil. A chisel head is often used on which the impact force of the device is concentrated. The second common application is demolition work, where concrete structures are often present, the demolition and destruction of which is a work particularly suited for hydraulic hammers.

A third application is the breaking of stones or bedrock. It is clear that hydraulic hammers are not used to replace blasting on large construction sites, but that it is often the case that stones or rocks are exposed to the ground, which are not intended to be blasted due to their size or location.

In particular the high pressures used in the relevant concrete and stone cause the material to break up in such a way that it is thrown to the surroundings. The surrounding objects are then at risk, while people in the vicinity are for some reason or other are more at risk. This is particularly harmful to humans.

From the prior art, protective covers are known to absorb and collect dust, keeping the working environment clean. Devices are also known which, in the same way, damp the vibrations caused by the percussion hammer.

Disclosure of Invention

The object of the invention is to propose a solution to the problem of ejected chips and fragments. In particular, it is an object to create a stable structure which effectively prevents the ejected stones and other materials from flying around outside the work site and causing danger. Another object is to provide a device which is also environmentally friendly.

The foregoing and other advantages and benefits of the present invention are realized in the manner described by the features in the appended claims.

Drawings

The invention will now be described in more detail with reference to the accompanying schematic drawings, which show a simplified illustration of a preferred embodiment of the invention.

Figure 1 shows an assembly equipped with a device according to the invention, seen in a partially transparent side section; and

fig. 2 shows the same structure, but it is a partially separated structure as seen from an angle.

Detailed Description

The figures thus show a hydraulic hammer equipped with a device according to the invention. The drawing is drawn transparent. The hydraulic hammer 1 is generally of the type in which a hydraulic hose (not shown) is introduced into the assembly and in which all the elements by means of which the impact action is achieved at the machining head (workpoint) 2 or at the machining point are located. In the figure, the body of the hammer is marked with the reference number 3 and some of the elements necessary for producing the impact are marked with the reference number 4. Such an assembly is connected to the boom of the excavator by means of a suitable mechanism. This connection mechanism is also not shown in the drawings due to its conventional nature, but the connection plane, to which a suitable (in particular quick-release) locking connection mechanism is connected, is designated by the reference numeral 5.

When such a hydraulic hammer is used to break hard materials such as rock, it is clear that due to the extreme forces, fragments and chips of different sizes fly from the machining head to the surroundings. As mentioned, these ejected parts can cause both damage to the material and, in particular, harm to persons in the vicinity.

According to the invention, the above-mentioned damage and injuries can be avoided by adding to the hydraulic hammer a protective cover 6 as shown in the drawing, which protective cover 6 can be lifted to a higher position, in which the operator can see the position of the machining head, and lowered to a lower position as shown in the drawing, in which it can protect the surroundings. Hydraulic cylinders 7,8 for lifting and lowering the guard are connected at their lower ends to the guard 6 by lugs 9,10 and at their upper ends to the body structure of the hammer by means of lugs 11, 12. In a known manner, the hydraulic pressure for operating the hydraulic cylinder is already present in the device shown. The hydraulic cylinders 7,8 are mainly double acting cylinders.

If necessary, suitable guides ensuring the required movement of the protective cover can be attached to the body 3 of the hammer 1. Such a guide may work on the principle of a slider-guide, but perhaps a more operationally reliable alternative is to use a short arm connected to the body of the hammer and at the other end to the guard, and which, when moved close to the body of the hammer, guides the guard to a lower position, and subsequently, when lifting the guard, which has been curved according to the length of the arm, also moves to an upper position close to the body.

According to a further preferred embodiment of the invention, the protective cover 6 is at least mainly made of recycled material. The material of the substantially cylindrical skirt can thus be taken from conveyor belts that cannot be reused, such as those that are replaced and replaced from time to time in many industrial sectors. The material must be strong enough to catch the stones and prevent them from entering the surrounding environment.

Another recycled material that can be advantageously used in the construction of the present invention is a non-reusable tire, preferably a heavy duty tire. One side of these tires is removed. This is shown with reference numeral 13. The sheath 6 is connected to the tread of the tyre 13 in a suitable manner, for example by means of a threaded connection.

As can be clearly seen in fig. 2, the protective cover according to the invention forms a substantially closed cup-shaped structure with a lid 14. Said cover 14 is mainly superimposed to the rest of the structure and is equipped with an opening 15 shaped like the body of the hydraulic hammer. In the best case, the cover 14 is an essentially tight device around the body 3 of the hydraulic hammer. Since in most cases the body is mainly square and also if there is a hole in the cover 14 for the body 3, which is relatively tight around the body, then a guide will naturally be formed and the protective cover can be raised or lowered by using a hydraulic cylinder, while the protective cover remains stable in place in all positions due to the hole. Another aspect is that dust and in particular noise hazards can be reduced because the protective cover on the one hand forms a closed space with respect to the base and on the other hand because the cover 14 fits tightly around the body.

The hydraulic hammer is often used in such a way that the machining head presses lower than the area surrounding it, resulting in a situation in which the protective cover still carries the machining head of the hydraulic hammer away from the surrounding area. To avoid this situation, the hydraulic cylinders 7,8 are used to lift the protective cover 6 depending on how the machining head 2 is pressed down at the work site. This function can be automated if necessary.

According to a second embodiment of the invention, no hydraulic cylinder is used, instead the protective cover 6, which in particular has a ring-like shape, is suspended in a suspended manner on a chain connected to the upper region of the body 3 of the hydraulic hammer. The above-mentioned carrying will not occur. Instead of chains, the protective cover may be connected to the body 3 by means of slide rails or the like allowing the protective cover to move vertically. If the hydraulic hammer is pressed down against the ground or other work surface in the working state, the protective cover will automatically rise along the slide guide.

It is clear that the protective cover 6 as shown is an effective protection against damage that may occur in all directions. The protective cover may also be manufactured in two or more parts, if desired. The structure of the integrated ring is the best choice in terms of structure and manufacture.

As mentioned, vehicle tires may be used as part of the structure. But if desired the jacket portion 6 can also be manufactured in particular from a large-size tire that cannot be reused on a vehicle or from two tire portions placed on top of each other. The tread of a vehicle tire is extremely durable in terms of impact resistance. Such a solution is cheap and completely feasible and, as far as its components are concerned, also solves the problem concerning recycling of the tyre. The wear of the tread does not at all impair the operation or reliability of the protective cover.

It is clear, however, that any material and any shape can be used for constructing the protective cover, since a circular shape is by no means necessary according to the basic idea of the invention.

The arrangement according to the invention also enables relatively simple retrofitting of existing rock crusher structures, so that a large proportion of the existing structures can be brought within safe working limits.

The invention, in addition to preventing stones or the like from being ejected, contributes to reducing dust generated during operation, and in particular the strong material used according to the invention also strongly reduces the harmful noise often generated during this type of operation.

Some possible alternatives of the invention are set out above. Many variations are possible within the basic idea of the invention and the scope of protection of the appended claims.

Claims (7)

1. A hydraulic hammer (1) comprising a hydraulic impact system, a machining head (2) for performing work and means to prevent damage caused by ejected fragments, characterized in that: the device is formed by a protective cage which can be lowered to the same level as the machining head (2) and is equipped with a closed sheath (6) and a cover (14) with an opening (15) therein, which protective cage forms a closed space and is shaped to fit around the body (3) of the hydraulic hammer, wherein the cover (14) is a substantially tight device around the body (3) of the hydraulic hammer, and wherein the protective cage is adapted to be lowered and raised using a hydraulic cylinder or cylinders (7,8) operated by the hydraulic pressure of the hydraulic hammer.

2. The hydraulic hammer of claim 1, wherein: the protective cover is formed by a circular ring, which is integrated or divided into several parts.

3. The hydraulic hammer of claim 1, wherein: the protective cover is mainly composed of a portion of a vehicle tyre, a conveyor belt or the like destined for recycling.

4. The hydraulic hammer of claim 1, wherein: the device also includes a guide to guide its upward/downward movement on a desired path.

5. The hydraulic hammer of claim 4, wherein: the guide is formed by an opening (15) in the cover (14) of the device, the shape and size of the opening (15) corresponding to the cross section of the body (3) of the hammer.

6. The hydraulic hammer of claim 1, wherein: the hydraulic cylinders (7,8) are connected at their upper ends to the body of the hammer by lugs (11,12) and at their lower ends to the protective cover by lugs (9, 10).

7. A hydraulic hammer according to any one of the preceding claims, wherein: the vertical dimension of the protective cover is greater than the length of the processing head (2).