Adapter connection for a pulse coder

Abstract

The application aims to provide an adapter connection structure of a pulse coder, which is connected to an outer end mounting surface of a support, an inner end mounting surface of the support is fixedly connected with a motor, a transition shaft is coaxially connected to a tail end of a rotor shaft of the motor, a shaft sleeve is sleeved on a shaft section of the transition shaft which is suspended to a hole cavity of the pulse coder, the shaft sleeve is arranged with the same core as the suspended shaft section and forms a locking fit with axial displacement. In the above scheme, the transition shaft is used as a component connected with the motor rotor shaft and also cooperates with the hole cavity of the pulse coder, which needs to ensure the same core degree with the motor rotor shaft and meet the cooperation requirement with the hole cavity of the pulse coder. The transition shaft with the shaft sleeve can ensure the precision requirement of the above connection and cooperation, so even if the pulse coder is replaced due to failure, the shaft sleeve with the size precision of the hole cavity of the pulse coder can be accurately measured in advance, and then the shaft sleeve is adjusted and locked in the screwing position of the suspended shaft section.

Description

Technical Field

[0001] This invention relates to a rotary drive device for a Kaldor furnace in the metallurgical industry, specifically an adapter mounting structure for a pulse coder or encoder of a drive motor. Background Technology

[0002] Kaldor furnaces are common equipment in the metallurgical industry. They operate under harsh conditions of high temperature, dust, molten metal splashing, and thermal radiation inside the furnace hood. The rotary motor is from ABB, and the pulse coder (or encoder) is from the Sick brand. Due to the manufacturer's discontinuation and redesign of the pulse coder, pulse coders from other manufacturers were used, but none of them could work properly. Multiple trips or data distortion faults occurred within a week, seriously affecting the normal production of the Kaldor furnace. The same type of pulse coder, the RHI-593 from Lennarlinde, was used. During use, the elastic connecting piece of the pulse coder frequently cracked and broke. The failure rate caused the motor to stall, the current fluctuation increased, and the speed could not be controlled and adjusted. Multiple debugging and related simulation tests were carried out, but the pulse coder failure problem was not substantially improved. Production was stopped 4-5 times a month for inspection, and 4 pulse coders had to be replaced every month, resulting in 5-6 days of downtime for maintenance. This posed a significant safety hazard and resulted in low work efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide an adapter connection structure for pulse coders, which is suitable for connecting pulse coders from different manufacturers and improves versatility.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a pulse coder adapter connection structure, wherein the pulse coder is connected to the outer end mounting surface of the bracket, the inner end mounting surface of the bracket is fixedly connected to the motor, the tail end of the motor rotor shaft is coaxially connected to a transition shaft, and a bushing is sleeved on the shaft segment extending into the pulse coder cavity through the transition shaft. The bushing and the extended shaft segment are coaxially arranged and form an adjustable locking fit in the axial direction.

[0005] In the above scheme, the transition shaft, as a component connected to the motor shaft, also needs to mate with the pulse coder cavity. It must ensure concentricity with the motor shaft and meet the mating requirements with the pulse coder cavity. The transition shaft with a bushing can ensure the accuracy requirements of both connection and mating. Therefore, even if the pulse coder needs to be replaced due to failure, the dimensional accuracy of the pulse coder cavity can be accurately measured in advance to provide a suitable bushing. Then, by adjusting the bolted position of the bushing on the overhanging shaft section and locking it, a high-precision fit with the pulse coder can be ensured. Attached Figure Description

[0006] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0007] Figure 2 This is a three-dimensional structural diagram of the present invention after the pulse coder and its support have been disassembled;

[0008] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0009] Figure 4 This is a three-dimensional schematic diagram of the assembly structure of the pulse code device, its support, and the transition shaft in the invention. Detailed Implementation

[0010] A pulse coder adapter connection structure is provided, wherein the pulse coder 10 is connected to the outer mounting surface of the bracket 20, the inner mounting surface of the bracket 20 is fixedly connected to the motor 1, and the tail end of the rotor shaft 2 of the motor 1 is coaxially connected to the transition shaft 30. The transition shaft 30 is fitted with a bushing 40 on the shaft segment 31 that extends into the cavity of the pulse coder 10. The bushing 40 and the extended shaft segment 31 are coaxially arranged and form an axially adjustable locking fit.

[0011] In the above scheme, the pulse coder 10 is fixed by the bracket 20, and the bracket 20 is then connected to the base or end cover of the motor 1, thus fixing the position between the pulse coder 10 and the motor 1 and placing it in a position that matches the rotor shaft 2 of the motor 1. The bracket 20 can be a П-shaped or Z-shaped cross-section structure. The inner end of the bracket 20 has an outer flange 21 forming a mounting surface that is connected to the end cover of the motor 1. The outer end of the bracket 20 has an annular plate-shaped mounting surface 22 for connecting and fixing the pulse coder 10, and the hole in the middle of the annular plate provides a transition shaft 30. The mounting surface formed by the outer flange 21 at the inner end of the bracket 20 and the edge of the annular plate-shaped mounting surface 22 at the outer end are connected by a connecting support plate 23 to ensure that the pulse coder 10 and the end face of the rotor shaft 2 of the motor 1 and the end cover of the motor 1 maintain an appropriate distance, so as to avoid the heat of the motor operation from being transferred to the pulse coder 10, which is already in a high-temperature environment, and at the same time, to reserve space for the specific structure of the transition shaft 30.

[0012] Referring to the attached diagram, the inner section 32 of the transition shaft 30 is concentrically inserted into the axial positioning hole at the tail end of the rotor shaft 2 of the motor 1. This structure ensures that the inner section 32 of the transition shaft 30 and the rotor shaft 2 of the motor 1 are precisely concentrically arranged. Because the core of the axial positioning hole at the tail end of the rotor shaft 2 of the motor 1 maintains its concentricity or coaxiality with its shaft core, the inner section 32 of the transition shaft 30 is inserted into it, thus ensuring the coaxiality between the transition shaft 30 and the rotor shaft 2 of the motor 1. Generally speaking, a transition fit is sufficient between the two.

[0013] A more preferred solution is that the middle part of the transition shaft 30 is a disk 33, the inner section 32 of which is coaxially inserted into the axial positioning hole at the tail end of the rotor shaft of the motor 1, the outer overhanging shaft section 31 has an external thread 311, and the shaft end has a threaded hole 312 extending towards the side where the disk 33 is located. The internal threaded tube section of the bushing 40 is screwed onto the external thread 311, and the locking screw 50 is engaged with the threaded hole 312 and the head 51 of the locking screw 50 is locked at the outer end of the bushing 40.

[0014] In the above scheme, the setting of the disc 33 ensures the axial depth of the transition shaft 30 inserted into the axial positioning hole at the tail end of the rotor shaft 2 of the motor 1, that is, ensures the axial limit between the transition shaft 30 and the rotor shaft 2 of the motor 1.

[0015] The head 51 of the locking screw 50 is locked onto the outer stepped surface of the necked hole at the outer end of the bushing 40. The outer end of the bushing 40 is designed as a necked hole, providing a pressing part for locking the head 51 of the locking screw 50. The locking screw 50 can be an internal hexagon head, Phillips head, or Torx head screw for easy tightening. At the same time, a countersunk hole is formed at the outer end of the bushing 40 to accommodate the screw head 51, thus preventing the head 51 from being exposed.

[0016] The disc 33 has circumferentially spaced connecting holes 331, which are parallel to the direction of the shaft core. Connecting bolts pass through the connecting holes 331 and connect to the connecting holes on the tail end face of the rotor shaft 2 of the motor 1. The connecting holes 331 on the disc 33 are used to connect bolts to achieve a reliable connection between the transition shaft 30 and the rotor shaft 2 of the motor 1.

[0017] The solution provided by this invention effectively solves the problem of incompatibility between pulse coders of the same specification and model from different manufacturers due to precision errors in the inner diameter, even among products from the same manufacturer. Furthermore, it addresses the issue of subtle differences in the axial length precision of the mating surfaces. This invention is suitable for pulse coders operating under harsh conditions, with large temperature differences, significant linear expansion, varying fit tolerances, increased prestress, and large deformation. The detachable and adjustable connection structure between the bushing 40 and the transition shaft 30 in this invention effectively solves the compatibility problem during pulse coder replacement. After 12 months of continuous use, its operation has been verified as normal, and no damage to the pulse coder caused by the compatibility structure provided by this invention has been observed. It should be noted that for newly purchased pulse coders, precise measurement of the bore diameter and depth is required. A bushing 40 with a suitable outer diameter should be selected, and the axial fit length between the bushing 40 and the transition shaft 30 should be adjusted and locked. To ensure the availability of suitable spare parts, the aperture and depth of the newly purchased pulse coder can be accurately measured, and a bushing 40 that meets the fitting requirements can be selected to match it for replacement. If environmental factors such as high temperature damage the electrical components of the pulse coder, the pre-matched bushing 40 and pulse coder can be directly replaced, and the transition shaft 30 does not need to be removed and replaced. Therefore, the timeliness of maintenance can be significantly improved.

Claims

1. A pulse coder adapter connection structure, wherein the pulse coder (10) is connected to the outer mounting surface of a bracket (20), and the inner mounting surface of the bracket (20) is fixedly connected to a motor (1), characterized in that: The tail end of the rotor shaft (2) of the motor (1) is coaxially connected with a transition shaft (30), the shaft section (31) of the transition shaft (30) which is suspended to the hole cavity of the pulse encoder (10) is sleeved with a shaft sleeve (40), the shaft sleeve (40) is arranged with the same core as the suspended shaft section (31) and forms a locking fit which is adjustable in axial direction; The inner end of the bracket (20) is provided with an external flange (21), the mounting surface formed by the flange (21) is connected with the end cover of the motor (1), the annular plate-shaped mounting surface (22) of the outer end of the bracket (20) is used to connect and fix the pulse encoder (10), the hole part in the middle of the annular plate surface is used to pass through the transition shaft (30), the flange (21) and the edge of the mounting surface (22) are connected by the connecting support connecting plate (23).

2. The pulse coder adaptation connection structure according to claim 1, characterized in that: The inner section (32) of the transition shaft (30) is coaxially inserted and matched with the axial positioning hole of the tail end of the rotor shaft (2) of the motor (1).

3. The pulse coder adaptation connection structure according to claim 1, characterized in that: The middle part of the transition shaft (30) is a disc (33), the inner section (32) of the inner side is coaxially inserted and matched with the axial positioning hole of the tail end of the rotor shaft of the motor (1), the suspended shaft section (31) of the outer side is provided with external threads (311) and a threaded hole (312) which extends to the side of the disc (33), the internal threaded tube section of the shaft sleeve (40) is screwed on the external threads (311), the locking screw (50) is matched with the threaded hole (312) and the nail head (51) of the locking screw (50) is locked at the outer end part of the shaft sleeve (40).

4. The pulse coder adaptation connection structure according to claim 3, characterized in that: The nail head (51) of the locking screw (50) is locked at the outer side step surface of the outer end necking hole of the shaft sleeve (40).

5. The pulse coder adaptation connection structure according to claim 3, characterized in that: The circumferential interval arrangement connecting holes (331) of the disc (33) are parallel to the axial core direction, the connecting bolts are passed through the connecting holes (331) and connected to the connecting holes on the tail end surface of the rotor shaft (2) of the motor (1).

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