阅读说明：本技术 用于轨道捣固机的捣固机组 (Tamping unit for a track tamping machine ) 是由 B.利赫特伯格 于 2019-01-08 设计创作，主要内容包括：一种用于轨道捣固机的捣固机组(1),其具有布置在支架(7)上的、设计为振动杆的捣固工具对(3),支架能够在捣固机组框架内高度可调节地导引,所述捣固工具对的用于插入碎石道床(4)中的下部的捣固镐端部(10)能够通过振荡驱动器(11)被驱动并且能够液压地相对彼此进给,其中,捣固工具对的每个捣固工具(3)均配设有液压缸(11)和必要时用于确定液压缸位置的行程传感器(7),并且液压缸(11)形成捣固工具(3)的线性进给驱动器和振荡驱动器,并且其中,为了控制液压缸(11)设有电动液压阀(25),电动液压阀包括机械的液压缸控制阀部分(12)和配属的阀电子器件(13)。为了实现有利的结构设计关系,在此建议,阀电子器件(13)相对于液压缸(11)和/或机械的液压缸控制阀部分(12)减振地支承。(A tamping unit (1) for a track tamping machine, having a pair of tamping tools (3) arranged on a carriage (7) designed as a vibrating rod, which carriage can be guided in a tamping unit frame in a height-adjustable manner, the lower tamping pick ends (10) of the tamping tool pairs for insertion into the ballast bed (4) can be driven by an oscillating drive (11) and can be hydraulically fed relative to one another, wherein each tamping tool (3) of the pair of tamping tools is associated with a hydraulic cylinder (11) and a travel sensor (7) for determining the position of the hydraulic cylinder if necessary, and the hydraulic cylinder (11) forms a linear feed drive and an oscillating drive of the tamping tool (3), and wherein an electrohydraulic valve (25) is provided for controlling the hydraulic cylinder (11), said electrohydraulic valve comprising a mechanical cylinder control valve part (12) and associated valve electronics (13). In order to achieve an advantageous design relationship, it is proposed that the valve electronics (13) be mounted in a vibration-damped manner with respect to the hydraulic cylinder (11) and/or the mechanical cylinder control valve part (12).)

1. A tamping unit (1) for a track tamping machine, having a tamping tool pair (3) which is arranged on a support (7) and is designed as a vibrating rod, which support can be guided in a height-adjustable manner in a tamping unit frame, the tamping tool pair having lower tamping pick ends (10) for insertion into a ballast bed (4) which can be driven by an oscillating drive (11) and can be hydraulically fed relative to one another, wherein each tamping tool (3) of the tamping tool pair is assigned a hydraulic cylinder (11) and a stroke sensor (7) for determining the cylinder position, and the hydraulic cylinders (11) form a linear and oscillating drive of the tamping tool (3), and wherein an electrohydraulic valve (25) is provided for controlling the hydraulic cylinders (11), which electrohydraulic valve comprises a mechanical hydraulic cylinder control valve part (12) and associated valve electronics (13), characterized in that the valve electronics (13) is mounted in a vibration-damped manner by means of a vibration damper (D) relative to the hydraulic cylinder (11) and/or a hydraulic cylinder control valve part (12) of the machine.

2. Tamping unit (1) according to claim 1, wherein said valve electronics (13) and the hydraulic cylinder control valve part (12) of the machine are vibration-dampened supported relative to the hydraulic cylinder (11) by means of a vibration dampener (D).

3. A tamping unit (1) according to claim 1 or 2, wherein said valve electronics (13) and optionally said mechanical cylinder control valve portion (12) are arranged spaced apart from said hydraulic cylinder (11).

4. Tamping unit according to claim 1 or 2, wherein the hydraulic cylinder control valve part (12) of said machine is arranged on said hydraulic cylinder (11) with damping by means of a damper (D).

5. Tamping unit according to any of claims 1 to 4, wherein said valve electronics (13) is vibration-damped by means of a vibration damper (D) arranged on the hydraulic cylinder control valve part (12) of the machine.

6. Tamping unit according to any of claims 1 to 5, wherein a hydraulic accumulator (S) is arranged in the hydraulic pressure supply line (P) to the hydraulic cylinder control valve section (12) of the machine.

7. Tamping unit according to any of claims 1 to 5, wherein a hydraulic accumulator (S) is arranged in the hydraulic tank return line (T) of the hydraulic cylinder control valve section (12) of the machine.

Technical Field

The invention relates to a tamping unit for a track tamping machine, having a pair of tamping tools, which are arranged on a support and are designed as oscillating rods, which support can be guided in a height-adjustable manner in a tamping unit frame, the tamping pick ends of the pair of tamping tools for inserting into a ballast bed can be driven by an oscillating drive and can be hydraulically fed relative to one another, wherein each tamping tool of the pair of tamping tools is assigned a hydraulic cylinder and a stroke sensor, which optionally determines the position of the hydraulic cylinder, and the hydraulic cylinders form a linear feed drive and an oscillating drive of the tamping tool, and wherein an electrohydraulic valve is provided for controlling the hydraulic cylinders, which electrohydraulic valve comprises a mechanical hydraulic cylinder control valve part and associated valve electronics.

Background

The tamping unit penetrates the ballast of the track bed in the region between two sleepers (intermediate sleeper box) in the bearing region of the sleepers in the ballast below the rails by means of a tamping tool and compacts the ballast between opposing tamping picks which can be fed relative to one another by means of dynamic vibration of the tamping picks. A tamping unit can stamp one, two or more sleepers in one working cycle (DE 2424829A, EP 1653003 a 2). According to the teaching of EP 1653003 a2, the feed drive acting as a linear drive is designed such that it not only generates a linear feed movement, but AT the same time also generates the necessary vibrations for the tamping pick in the manner known from AT 339358, EP 0331956 or US 4068595. The feed speed, amplitude, form and frequency of the oscillation can thus be preset.

The movement of the tamping unit comprises a vertical insertion of the tamping picks into the ballast, a feed movement in which the ends of the tamping picks are closed off from one another, and a superimposed dynamic oscillation, the superimposed dynamic oscillation effecting the actual compaction of the ballast particles. It is known to use hydraulic cylinders for the feed movement, which hydraulic cylinders also form the tamping drive (AT 513973 a).

The optimum tamping frequency for compacting is between 25 and 40Hz in a known manner, wherein higher frequencies make it easier for the tamping pick to enter the ballast, since only small insertion collisions occur and therefore the stresses on the bearing structure of the tamping pick assembly can be reduced.

The known solution of a fully hydraulic linear tamper drive (AT 513973 a), which has a combination of a hydraulic cylinder and a control valve mounted directly on the hydraulic cylinder for simultaneously generating the vibration and the feed movement, withstands large accelerations due to the vibrations. This places high stresses on the control valve, which is mounted directly on the cylinder, or on its control electronics integrated in the valve. Thereby reducing the life and service time of the valve. Another disadvantage is that the A, B line of the hydraulic valve must be integrated directly as a bore in the cylinder. Thereby increasing the size and cost of the dedicated cylinder. The increased size of the cylinders is disadvantageous in the case of narrow spaces in the tamping unit. In addition, high pressure fluctuations occur in the pressure line and the tank line of the control valve, which additionally stress the control valve. The maximum pressure, on the other hand, also stresses the fittings of the hydraulic lines and the hydraulic lines themselves. This results in a reduced lifetime and difficulties in maintaining a seal of the hydraulic bolt connection permanently.

Disclosure of Invention

The object of the invention is therefore to develop a tamping unit of the aforementioned type such that the durability of the fully hydraulic tamping drive is significantly increased.

This object is achieved according to the invention in that the valve electronics are mounted in a vibration-damped manner by means of a vibration damper in relation to the hydraulic cylinder and/or a hydraulic cylinder control valve of the machine.

The valve electronics of the hydraulic control valve are designed separately from the (electromechanical) part of the hydraulic control valve. This enables the valve electronics to be mounted in a vibration-damped manner relative to the hydraulic cylinder and/or the mechanical cylinder control valve part. The vibration-damped bearing structure can be formed by a corresponding rubber-elastic element, by a spring-damping element or the like. The durability of the fully hydraulic tamping drive is significantly increased by this measure.

The valve electronics and the mechanical cylinder control valve part can be mounted in a vibration-damped manner by means of a vibration damper, either individually or jointly with respect to the hydraulic cylinder.

One possible embodiment of the invention is that the valve electronics and, if appropriate, the hydraulic cylinder control valve part of the machine are arranged at a distance from the hydraulic cylinder, with corresponding damping. The mechanical cylinder control valve part can also be arranged directly on the cylinder with damping by means of a damper. Furthermore, it is possible to arrange the valve electronics directly on the hydraulic cylinder control valve part of the machine with vibration damping by means of a vibration damper.

It is also recommended that a hydraulic accumulator is arranged in the hydraulic pressure supply line to the hydraulic cylinder control valve section of the machine and/or that a hydraulic accumulator is installed in the hydraulic tank return line of the hydraulic cylinder control valve section of the machine. The maximum pressure that increases the wear can thereby be reduced.

Furthermore, the valve, which is installed separately from the hydraulic cylinder, has the advantage according to the invention that a simple, cost-effective cylinder with a smaller design can be used. Mounting the hydraulic accumulator close to the hydraulic control valve reduces the maximum pressure in the hydraulic line and thus also reduces the stress of the hydraulic control valve, the seals, the fittings and the hydraulic line itself. The error-prone support by the damping of the interference-prone valve electronics significantly reduces the error-prone.

Drawings

The technical solution of the invention is exemplarily shown in the drawings. In the drawings:

figure 1 shows a fully hydraulic tamping drive in a side view in partial section,

FIG. 2 shows a view of a tamping unit with a fully hydraulic tamping drive, an

Fig. 3 shows a further view of the tamping unit with a fully hydraulic tamping drive.

Detailed Description

Fig. 1 shows a fully hydraulic linear tamping drive. The hydraulic cylinder 11 has a bore embedded in the cylinder body which serves as the hydraulic input 20 and is supplied directly by the added valve 25 through the port A, B. Hydraulic fluid under pressure from the hydraulic pump is fed via a hydraulic pressure feed line P to the control valve 25, which hydraulic fluid is returned to the hydraulic tank via a hydraulic tank return line T. As in the hydraulic tank return line T, a hydraulic accumulator S is likewise arranged in the hydraulic pressure supply line P to the hydraulic cylinder control valve part 12 of the machine.

A stroke sensor 17 is integrated in the hydraulic cylinder 11. In this case, an embodiment as an inductive travel sensor is shown, in which a position magnet 24 is provided, by means of which the deflection of the piston 21 is measured. If the cylinder chamber 23 is placed under pressure P via port B, the piston moves to the left. If the pressure load on the piston is transferred to the joint a by means of the valve 25, the piston 21 moves to the other side. The valve electronics (13) is supported in a vibration-damped manner by means of a vibration damper (D) on the hydraulic cylinder control valve part 12 of the machine.

Fig. 2 schematically shows a tamping unit 1. The tamping unit 1 for a track tamping machine comprises a tamping tool pair 3, which is arranged on a support 7 and is designed as a vibrating rod, the lower tamping pick ends 10 of which for insertion into the ballast bed 4 can be driven by an oscillating drive and can be hydraulically fed relative to one another. Each tamping tool 3 of a tamping tool pair is equipped with a hydraulic cylinder 11 and, if necessary, a stroke sensor 17 for determining the position of the hydraulic cylinder. But the travel sensor may be eliminated. The hydraulic cylinders 11 constitute the linear feed drive and the oscillating drive of the tamping tool 3. For controlling the hydraulic cylinders 11, electrohydraulic valves are provided, which comprise a mechanical cylinder control valve part 12 and associated valve electronics 13. The valve electronics 13 are mounted in a vibration-damped manner with respect to the hydraulic cylinder 11 and/or the mechanical cylinder control valve part 12 by means of a vibration damper D. The damper D is shown in this embodiment as a rubber-elastic bearing structure.

During tamping, the tamping pick is inserted into the ballast 4 of the track 1 and compacts the ballast 4 located below the sleepers 2. The sleepers 2 are fixed to rails 6. The tamping arm 3 is hingedly fixed to the tamping frame 7. The tamping frame 7 is moved up and down on vertical guides 8 by means of a drive 9. In the drawing, the mechanical cylinder control valve part 12 is according to the invention mounted separately from the crash-sensitive valve electronics 13. The control and regulating electronics 14 are connected to a travel sensor 17 via an electrical connection 16. Furthermore, the valve electronics 13 are controlled via a control line 15. The control valve section 12 directly in the dedicated cylinder 11 is supplied via a pressure line P and a tank line T.

Fig. 3 shows, according to the invention, a hydraulic cylinder 11, which is shown schematically in a sectional view, and which is connected via hydraulic lines a and B to a separately vibration-proof control valve 25. The control valve 25 is supplied via a pressure line P and returns oil to the tank via a tank line T. The maximum pressure on the pressure line and the tank line is reduced by the hydraulic pressure accumulator S installed according to the invention.