RU181140U1 - DEVICE FOR TENSIONING THE SCRAPER CONVEYOR CHAIN - Google Patents

Abstract

Field of technology: mechanical engineering. Direct application: in drive stations of a mine scraper conveyor. The essence of the utility model: the friction mechanism (17) is made in the form of a package of friction disks installed with the possibility of axial movement, the elastic element (4) is kinematically connected to the shaft (3) and the pressure element (5), the actuator of the pressure element contains a piston (6) installed in the cover (2), which interacts with the pressure element (5) installed in the cover (2) with the possibility of axial movement of the piston (6) retainer (7), pressure chamber (8), which is limited in the cover (2), which is limited by the surfaces of the piston (6) and its rod (6.1) and is hydraulically connected to the pressure block (10) by a channel (9) made in the cover (2). Technical result: improvement safety conditions and increase the service life of the traction chain.

Description

Technical field

The technical solution relates to mechanical engineering, namely to conveyor transport and can be used in drive stations of a mine scraper conveyor.

State of the art

It is known from the prior art that a device for tensioning a chain of a scraper conveyor is selected as the closest analogue and is mounted on the drive unit of the scraper conveyor, comprising a housing of two halves (upper and lower) that is attached to the gearbox flange on the opposite side of the gearbox output shaft, with a hub on the splines, located on the shaft of the device, which is in contact with the stationary brake friction pads of the housing and the movable brake friction pads, pivotally fixed E on the lever. The movable brake friction pads are pivotally mounted with forks on separate pivoting levers connected to the axes of the brackets mounted motionlessly on the body and a nut, during the movement of which they brake or brake the brake disc. [one]

The disadvantages of the closest analogue are that the friction mechanism of the chain tension device is designed for the torque of the gearbox shaft of the drive unit, which is much lower than the torque of the conveyor shaft, which does not allow the chain tensioner to be moved to the opposite side of the frame of the drive section and thereby increase the size and the mass of the head drive unit of the conveyor, which affect the skew of the frame of the drive section in weak soils and, especially, when moving the conveyor.

The technical solution is based on the task of developing the design of a device for chain tension, which will increase the friction mechanism force according to the braking moment of the conveyor shaft, and to some extent balance the head drive unit of the conveyor in size and weight.

As a result of solving this problem, a technical result will be obtained, which consists in providing a more smooth adjustment of the chain tension process and stabilization of the fixing force of the conveyor drive shaft.

Achieving the claimed technical result will provide the technical solution with consumer properties: improving the state of safety and increasing the service life of the traction chain.

Disclosure of a technical solution

In a chain tensioner for a mine scraper conveyor, which comprises a housing (1), in which a friction mechanism (17) is placed that interacts with a pressure element (5), a shaft (3) with an elastic element (4), a cover (2), a pressure actuator of the element, it is proposed that the friction mechanism (17) be made in the form of a package of friction disks mounted for axial movement, the elastic element (4) is kinematically coupled to the shaft (3) and the pressure element (5), the drive of the pressure element can be configured as installed in the cover (2) ) piston (6), which is mutually It works with a pressure element (5) installed in the cover (2) with the possibility of axial movement of the piston lock (7) (6), made in the cover (2) of the pressure chamber (8), which is limited by the surfaces of the piston (6) and its rod ( 6.1) and hydraulically connected to the pressure unit (10) by a channel (9) made in the cover (2).

The essential features of the utility model listed above, which are different from the closest analogue, are necessary and sufficient in all cases to which the scope of legal protection of the utility model applies.

In addition, it is proposed:

- pressure unit (10), to be made in the form of a reversible hand pump (10.1) hydraulically connected to the container (10.2).

- the clamp (7) of the piston (6) is made in the form of an axis (7.1) with a lever element (7.2), which is coupled to the cover (2) with a threaded connection.

The causal relationship between the new essential features of the device and the obtained technical result is explained as follows.

Stepless adjustment of the chain tension force by the conveyor shaft (14) is carried out due to the gradual increase and adjustment of the pressure block (10) of the pressure in the pressure chamber (8) of the working fluid with a reversible hand pump (10), under which the piston (6) gradually increases to the required force on the pressure element (5), while the package of friction disks under the influence of the pressure element (5) distributes the load of the shaft torque by the combination of friction disk clutches, which significantly reduces the critical load, th to chain scission.

The smooth distribution of the tension of the traction chain in the idle and the working branch of the conveyor, after its tension, is ensured by using the pressure of the working fluid in the pressure chamber (8), because after the axis (7.1) of the piston retainer (7) is retracted to its original position, the pressure of the working fluid does not drastically weaken the interaction between the pressure element (5) and the friction disc package, this allows the shaft (14) to be smoothly disengaged in the reverse order and to obtain the chain tension and the lower branch of the conveyor, which will affect the optimal distribution of loads in the traction chain and, accordingly, increase the time of its stretching and sagging during the operation of the conveyor.

The stabilization of the fixing force of the conveyor shaft (14) is ensured by the piston lock (7), which locks the piston rod (6.1) (6) when the axis (7.1) moves along the thread in the hole (2.1) and thereby limits the piston (6), which prevents the pressure element (5) from decreasing in case of pressure loss in the pressure chamber (8).

The claimed technical solution is illustrated by an example, the implementation of which is not the only possible, but clearly demonstrates the possibility of achieving the technical result of the proposed new set of essential features.

The essence of the proposed technical solution is presented in the drawings, where:

- in FIG. 1 shows a cross section through a drive section with an opposed drive unit and a chain tensioner;

- in FIG. 2 shows a longitudinal section through a chain tensioner.

Brief Description of the Drawings

1 - housing;

1.1 - flange;

1.2 - bolted connection;

1.3 - bearing;

2 - cover;

2.1 - through hole;

3 - shaft;

3.2 - the output part of the shaft;

4 - an elastic element;

5 - pressure element;

6 - the piston;

6.1 - stock;

7 - piston lock;

7.1 - axis;

7.2 - lever element;

8 - pressure chamber;

9 - channel;

10 - pressure block;

10.1. - reversible hand pump;

10.2 - container;

10.3 - pipeline;

11 - pressure gauge;

12 - channel;

13 - gear sleeve;

14 - conveyor shaft;

15 - frame drive section;

16 - head drive unit;

17 - friction mechanism (hereinafter the package of friction disks).

Industrial applicability

The housing (1) with a cover (2) and the pressure unit (10) of the scraper conveyor chain tensioner are mounted opposite to the head drive unit (16) outside the frame of the drive section (15) of the scraper conveyor (Fig. 1). Direct kinematic connection of the chain tensioning device with the conveyor shaft (14) is made in the form of a spline connection of the output part (3.2) of the shaft (3) and the gear sleeve (13) (Fig. 1). The casing (1) of the chain tensioning device is fastened by bolting (1.2) of its flange (1.1) to the frame of the drive station (15), while the pressure unit (10) can be placed both on the drive station (15) and near her (Fig. 1). The friction mechanism of the device is presented in the form of a package of friction discs (17) located in the housing (1), some of which are mounted on the inner surface of the housing (1) with axial movement, while others are mounted on the shaft (3) with axial movement. The quantitative configuration of the friction disc package depends on the power of the head drive unit (16), i.e. the more power, the greater the number of friction discs.

To tension the traction chain, the conveyor shaft (14) is pre-locked by fixing the shaft (3) installed in the bearing (1.3) in the housing (1). Using a manual reversible pump (10.1) of the pressure unit (10) from the container (10.2), the working fluid flows through the pipeline (10.3) and the channel (9) under pressure into the pressure chamber (8) of the cover (2). The value of the working fluid pressure in the pressure chamber (8), necessary to reduce the torque on the shaft (3), is displayed on the pressure gauge (11), which is fixed in the channel (12) of the cover (2) connected to the chamber (8). The pressure indicators on the manometer (11), necessary to create the optimum piston force (6), are calculated depending on the characteristics of the friction disc package (17) and the power of the head drive unit (16).

The piston (6) under pressure of the working fluid abuts against the pressure element (5), which presses the package of friction discs (17), as a result of which the shaft (3) is fixed. After that, the piston lock (7) is activated. By rotating the lever element (7.2), presented in the form of a flywheel, the axis (7.1) moves along the thread of the through hole (2.1) and presses the rod (6.1), as a result of which the piston force (6) applied to the pressure element (5) is fixed. Further, by briefly turning on the head drive unit (16), the conveyor shaft (14) step-by-step eliminates the sagging of the traction chain by tensioning it.

Due to the fact that the end drive (not shown in the figure) is turned off, and the tension is produced only by short-term inclusions of the head drive unit (16), and the traction chain scraper is locked by stops (not shown in the figure), which are installed in the holes (15.1) of the working bottom branches of the conveyor at some distance from the conveyor shaft (14) (not shown in the figure), a significant voltage appears in the idle branch in the traction chain under the action of the torque (M) of the conveyor shaft (14) (Fig. 1). To continue the work related to pulling, shortening and connecting the traction chain, the shaft is completely fixed (3) by increasing the pressure in the pressure chamber (8) followed by fixing of the piston (6).

The combined friction clutch in the package of friction disks (17) and the fixing of the piston force (6) provide sufficient resistance to the rollback of inertial masses, which occurs under the tension of the traction chain, to the side opposite to the tension of the traction chain in the idle branch.

After completing work on the tension of the traction chain (pulling it, shortening and connecting it), it is necessary to distribute the force of the traction chain in the working and idle branches of the conveyor. To do this, the reversible hand pump (10.1) is switched to the pumpdown mode, then, by rotating the lever element (7.2), the axis (7.1) of the lock (7) is unscrewed, while the elastic element (4) is unclenched and moves the pressure element (5), as a result, the working fluid is displaced by the piston (6) from the pressure chamber (8) into the container (10.2).

Due to the gradual decrease in pressure in the pressure chamber (8), the friction clutch in the package of friction disks (17) decreases, and the shaft (3), and, accordingly, the conveyor shaft (14) smoothly disengages, which makes it possible to distribute the force of the traction chain in the working and idle conveyor branches.

The application of the proposed device allows you to place it in the form of a removable block opposite to the head drive unit (16) outside the conveyor frame (15) and, thereby, reduce the size and weight of the head drive unit (16), which significantly reduces the load at which the drive frame can be skewed sections for weak soils and, especially, when moving the conveyor.

The possibility of manual control of a reversible hand pump (10.1) and a piston retainer (7) (6) makes it possible to simplify the design and ensure the autonomy of the drive of the pressure element, while the reverse of the hand pump (10.1) provides multiple reuse of the working fluid.

Information sources:

1. Patent of Ukraine for utility model No. 79661, publ. 04/25/2013, bull. Number 8.

Claims (3)

1. The chain tension device of a mine scraper conveyor, which contains a housing (1), in which a friction mechanism (17) is placed that interacts with a pressure element (5), a shaft (3) with an elastic element (4), a cover (2), a drive pressure element, characterized in that the friction mechanism (17) is made in the form of a package of friction disks mounted with axial movement, the elastic element (4) is kinematically connected with the shaft (3) and pressure element (5), the actuator of the pressure element contains the cap (2) the piston (6) which interacts There is a pressure element (5) installed in the cover (2) with the possibility of axial movement of the piston retainer (7) (6), a pressure chamber (8) made in the cover (2), which is limited by the surfaces of the piston (6) and its rod ( 6.1) and is hydraulically connected to the pressure unit (10) by a channel (9) made in the cover (2). 2. The device according to claim 1, characterized in that the pressure unit (10) is made in the form of a reversible hand pump (10.1) hydraulically connected to the container (10.2). 3. The device according to claim 1, characterized in that the lock (7) of the piston (6) is made in the form of an axis (7.1) with a lever element (7.2), which is coupled to the cover (2) with a threaded connection.

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