Valve element grinding device

Abstract

The utility model discloses a valve element grinding device which comprises a machine tool base, a spindle box, a turning tool rest assembly, a spindle and a valve element limiting unit. The valve element limiting unit comprises a first valve element limiting piece and a second valve element limiting piece, the first valve element limiting piece is detachably connected with the first end of the main shaft, and the second valve element limiting piece is connected with the second end of the main shaft. The first valve element limiting piece and the second valve element limiting piece play a role in limiting a valve element of a common valve and a valve rod of the integrated valve element and valve rod structure correspondingly. The first valve element limiting piece is installed at the first end of the main shaft, and a valve element of a common valve can be limited and fixed to one side of the turning tool rest assembly through the first valve element limiting piece. The first valve element limiting piece located at the first end of the main shaft is detached, and then an avoiding position can be provided for installation of the integrated valve element and valve rod structure. Therefore, the valve element grinding device can be suitable for valve element cutting machining of a common valve and can also be used for valve element cutting machining of an integrated all-welded ball valve.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power pipeline system valve mechanical processing, in particular to a valve core grinding device. Background Art

[0002] The one-piece fully welded ball valve is a valve with an integrated stem and valve core, that is, the stem and valve core are connected into a whole by welding technology. This design can improve the structural strength and sealing performance of the valve. This one-piece fully welded ball valve is suitable for harsh industrial environments and media conditions due to its high performance and high reliability, and is widely used in the pipeline system of nuclear power plants. Various high-requirement and high-standard stop valves, lift check valves, safety valves, etc. in the pipeline system of nuclear power plants all use this one-piece fully welded ball valve. However, since the stem and valve core of the one-piece fully welded ball valve are an integrated design, when the valve core needs to be repaired and processed, it is usually necessary to separate the valve core and the stem first, and then transport the valve core to the designated machining workshop for repair by professional machining personnel. The steps for separating the valve core and the valve stem are roughly as follows: first, grind the spot welding of the valve core fixing nut to separate the valve core from the valve stem. The valve core may be damaged during cutting, causing secondary damage. After that, the separated valve core is transported to the machining workshop for turning and grinding. Finally, the separated valve core and valve stem must be welded together again, and then the re-welded valve core and valve stem must be reinstalled and tested. Any error in any of the above steps may result in unqualified repair and processing and the above process must be repeated again. Therefore, the valve core repair and processing method for the one-piece fully welded ball valve in the prior art wastes a lot of time and labor costs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a valve core grinding device in view of at least one defect of the above-mentioned prior art.

[0004] The utility model solves the technical problem by adopting the following technical solution: providing a valve core grinding device, which comprises a machine tool base, a spindle box, a turning tool holder assembly, a spindle and a valve core limiting unit;

[0005] The spindle box and the turning tool holder assembly are respectively arranged on the machine tool base, and the turning tool holder assembly is located on one side of the spindle box;

[0006] The spindle box includes a box body and a driving assembly arranged in the box body, the spindle is arranged in the box body and is in transmission connection with the driving assembly, the spindle includes a first end and a second end, the first end and the second end of the spindle are respectively located on opposite sides outside the box body, and the first end of the spindle is closer to the turning tool holder assembly than the second end thereof, the spindle is a hollow structure, and the interior of the spindle defines a hollow area that passes through the first end and the second end thereof and through which the valve stem of the integrated fully welded ball valve is arranged;

[0007] The valve core limiting unit includes a first valve core limiting member and a second valve core limiting member, wherein the first valve core limiting member is detachably connected to the first end of the main shaft, and the second valve core limiting member is connected to the second end of the main shaft.

[0008] Preferably, the first valve core limiter comprises a first base and at least three first claws arranged on the first base, the second valve core of the common valve can be clamped between the first claws, and the first base is detachably connected to the first end of the main shaft.

[0009] Preferably, the valve core grinding device further comprises a quick connection shaft, which is sleeved on the outer periphery of the first end of the main shaft and is detachably connected to the first base.

[0010] Preferably, the second valve core stopper comprises a second base and at least three second claws arranged on the second base, and the valve stem of the one-piece fully welded ball valve can be clamped between each of the second claws.

[0011] Preferably, the turning tool holder assembly comprises a turning base and a turning tool holder, the turning base is slidably connected to the machine tool base, and the turning tool holder is fixedly connected to the turning base.

[0012] Preferably, a first guide structure is provided on the machine tool base, and a second guide structure is provided on the turning base, one of the first guide structure and the second guide structure is a slide rail, and the other is a slide groove, and the first guide structure and the second guide structure are slidably matched.

[0013] Preferably, the valve core grinding device further comprises a grinder detachably or non-detachably arranged on the turning base, and the grinder is located at one side of the turning tool holder.

[0014] Preferably, the grinding machine comprises a grinding base, a grinding main unit and a grinding disc, the grinding base is detachably connected to the turning base, the grinding main unit is fixedly connected to the grinding base, and the grinding disc is transmission-connected to the grinding main unit.

[0015] Preferably, a third guide structure is provided on the turning base, and a fourth guide structure is provided on the grinding base. One of the third guide structure and the fourth guide structure is a slide rail, and the other is a slide groove. The third guide structure is slidably matched with the fourth guide structure.

[0016] Preferably, the valve core grinding device also includes an electric control box connected to the spindle box.

[0017] The utility model has at least the following beneficial effects: the first valve core limiter and the second valve core limiter respectively limit the valve core of the common valve and the valve stem of the integrated valve core valve stem structure. By installing the first valve core limiter at the first end of the main shaft, the valve core of the common valve can be limited and fixed on one side of the turning tool holder assembly by using the first valve core limiter; by removing the first valve core limiter located at the first end of the main shaft, a clearance can be provided for the installation of the integrated valve core valve stem structure. Therefore, the valve core grinding device of the utility model can be used for valve core cutting of common valves and valve core cutting of integrated fully welded ball valves. After adopting the valve core grinding device of the utility model, there is no need to disassemble and reconnect the valve core and valve stem of the integrated fully welded ball valve, which saves a lot of time and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0019] Figure 1 It is a structural schematic diagram of a valve core of a common valve installed in a valve core grinding device in some embodiments of the utility model;

[0020] Figure 2 It is a structural schematic diagram of an integrated valve core and valve stem structure of an integrated fully welded ball valve when it is installed in a valve core grinding device in some embodiments of the utility model. DETAILED DESCRIPTION

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0022] The terms "first", "second", "third", etc. are only used to facilitate the description of the present technical solution and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features.

[0023] like Figure 1 and Figure 2As shown, the valve core grinding device of some embodiments of the utility model includes a machine tool base 1, a spindle box 2, a turning tool holder assembly 3, a spindle (not shown) and a valve core limit unit. The machine tool base 1 serves as the basic component of the valve core grinding device and provides a basis for the installation of other components. The spindle is used to clamp the workpiece or clamp the workpiece through a fixture so that the workpiece can rotate with the spindle. The workpiece includes two categories in the utility model: the valve core of an ordinary valve and the integrated valve core valve stem structure 5 of an integrated fully welded ball valve. That is, the ordinary valve described in this article refers to other valves except the integrated fully welded ball valve. In order to facilitate the distinction of the component names, the integrated valve core valve stem structure 5 includes a first valve core and a valve stem connected to each other, and the valve core of the ordinary valve is referred to as the second valve core 62 in this article. The rotation speed of the spindle can be adjusted by a speed change mechanism in the spindle box 2.

[0024] The spindle box 2 and the turning tool holder assembly 3 are respectively arranged on the machine tool base 1, and the turning tool holder assembly 3 is located on one side of the spindle box 2. The turning tool holder assembly 3 is mainly used to provide support and positioning for the turning tool (not shown). The structural form of the turning tool can refer to the prior art. The spindle box 2 includes a box body and a drive assembly (not shown) arranged in the box body. The main shaft is passed through the box body and is connected to the drive assembly for transmission. Specifically, the drive assembly includes components such as a gear assembly, a speed change mechanism, and a drive motor. The drive assembly can drive the main shaft to rotate, adjust the rotation speed of the main shaft, etc.

[0025] The spindle includes a first end and a second end, and the first end and the second end of the spindle are respectively located on opposite sides outside the box. The middle area between the first end and the second end of the spindle is accommodated in the box. The first end of the spindle is closer to the turning tool holder assembly 3 than the second end thereof. Specifically, Figure 1 In the illustrated embodiment, the turning tool holder assembly 3 is located on the right side of the spindle box 2. The first end of the spindle is located on the right side of the spindle box 2, and the second end of the spindle is located on the left side of the spindle box 2. The spindle is a hollow structure, and a hollow area is defined inside the spindle, which passes through the first end and the second end of the spindle, and the valve stem 51 of the one-piece fully welded ball valve is arranged in the hollow area. That is, the valve stem 51 of the one-piece fully welded ball valve can pass through the hollow area of ​​the spindle.

[0026] The valve core limiting unit includes a first valve core limiting member 41 and a second valve core limiting member 42, and the first valve core limiting member 41 is detachably connected to the first end of the main shaft. The second valve core 62 can be limited at the first end of the main shaft by the first valve core limiting member 41, and then the second valve core 62 is turned by the turning tool on the turning tool holder assembly 3. The second valve core limiting member 42 is connected to the second end of the main shaft, and the end of the valve stem 51 of the one-piece fully welded ball valve away from the first valve core 50 can be limited at the second end of the main shaft by the second valve core limiting member 42 to prevent the valve stem 51 from swinging and vibrating during the turning process. Since the first valve core limiting member 41 is detachably connected to the first end of the main shaft, after the first valve core limiting member 41 is removed from the first end of the main shaft, the valve core of the one-piece fully welded ball valve can be located at the first end of the main shaft.

[0027] Specifically, Figure 1 As shown, the process of the valve core grinding device of one embodiment of the utility model for cutting the second valve core 62 (valve core of an ordinary valve) is as follows: first, select a suitable first valve core limiter 41 according to the type and size of the second valve core 62. Install the first valve core limiter 41 to the first end of the main shaft. The driving assembly drives the main shaft to rotate, and the rotation of the main shaft drives the first valve core limiter 41 and the second valve core 62 on the first valve core limiter 41 to rotate together. The turning tool on the turning tool holder assembly 3 approaches the second valve core 62 on the first valve core limiter 41, and turns the second valve core 62.

[0028] Specifically, Figure 2 As shown, the process of the valve core grinding device of one embodiment of the utility model for cutting the first valve core 50 of the integrated fully welded ball valve is as follows: the first valve core stopper 41 is separated from the first end of the main shaft. The valve stem 51 of the integrated valve core valve stem structure 5 is passed through the hollow area of ​​the main shaft, and the end of the valve stem 51 of the integrated valve core valve stem structure 5 away from the first valve core 50 is extended to the second valve core stopper 42, and the end of the valve stem 51 away from the first valve core 50 is limited and fixed by the second valve core stopper 42 to prevent the valve stem 51 from swinging and vibrating during the turning process. The first valve core 50 is located at the first end of the main shaft, and a suitable fastening sleeve is selected to fasten the first valve core 50 to the first end of the main shaft. The driving assembly drives the main shaft to rotate, and the rotation of the main shaft drives the first valve core 50 to rotate together. The turning tool on the turning tool holder assembly 3 approaches the first valve core 50 and turns it.

[0029] In summary, by installing the first valve core stopper 41 at the first end of the spindle, the second valve core 62 can be limited and fixed on one side of the turning tool holder assembly 3 by using the first valve core stopper 41, and the second valve core 62 can be cut by the turning tool installed on the turning tool holder assembly 3. After the first valve core stopper 41 is removed from the first end of the spindle, the valve stem 51 of the integrated valve core valve stem structure 5 can pass through the hollow area of ​​the spindle, and the end of the valve stem 51 of the integrated valve core valve stem structure 5 away from the first valve core 50 can be limited and fixed by the second valve core stopper 42 located at the second end of the spindle, and the first valve core 50 is located at the first end of the spindle, and the first valve core 50 can be cut by the turning tool installed on the turning tool holder assembly 3. Therefore, the first valve core stopper 41 and the second valve core stopper 42 respectively limit the second valve core 62 and the valve stem 51 of the integrated valve core valve stem structure 5. By installing the first valve core stopper 41 at the first end of the main shaft, the second valve core 62 can be fixed on one side of the turning tool holder assembly 3 by using the first valve core stopper 41; by removing the first valve core stopper 41 located at the first end of the main shaft, a clearance can be provided for the installation of the integrated valve core valve stem structure 5. Therefore, the valve core grinding device of the utility model can be used for valve core cutting processing of ordinary valves and valve core cutting processing of integrated fully welded ball valves. After adopting the valve core grinding device of the utility model, there is no need to disassemble and reconnect the valve core and valve stem 51 of the integrated fully welded ball valve, which saves a lot of time and labor costs.

[0030] like Figure 1 and Figure 2 As shown, in some embodiments, the first valve core stopper 41 includes a first base 410 and three first claws 411 arranged on the first base 410, and the second valve core 62 can be clamped between each first claw 411. However, in other embodiments, the number of the first claws 411 can also be more than three, such as four, five, six, etc. The claws are evenly distributed on the first base 410. The first base 410 is detachably connected to the first end of the main shaft. Specifically, the first base 410 is roughly cylindrical, and a through hole is provided on it for it to be sleeved and fixed on the outer periphery of the first end of the main shaft. The first valve core stopper 41 of the above-mentioned claw structure is suitable for a small conical valve core. However, in other embodiments, the structure of the first valve core stopper 41 is not limited to the above-mentioned claw structure, and the structure of the first valve core stopper 41 can be freely adjusted according to the type and size of the second valve core 62.

[0031] like Figure 1 and Figure 2As shown, in some embodiments, the valve core grinding device also includes a quick connection shaft 71, which is sleeved on the outer periphery of the first end of the main shaft and is detachably connected to the first base 410. That is, the quick connection shaft 71 is connected between the main shaft and the first end and the first base 410. The quick connection shaft 71 can be adapted to the first base 410 of the first valve core stopper 41 of different structural types. Through the quick connection shaft 71, different first valve core stoppers 41 can be easily replaced to adapt to different second valve cores 62. When it is necessary to install the integrated valve core valve stem structure 5, the quick connection shaft 71 and the first valve core stopper 41 can be removed from the first end of the main shaft together. When installing the integrated valve core valve stem structure 5, a suitable fastening sleeve is selected to connect the first valve core 50 with the quick connection shaft 71.

[0032] like Figure 1 and Figure 2 As shown, in some embodiments, the second valve core stopper 42 includes a second base 421 and three second claws 422 arranged on the second base 421, and the valve stem 51 of the one-piece fully welded ball valve can be clamped between the second claws 422. However, in other embodiments, the number of the second claws 422 can also be more than three, such as four, five, six, etc. Specifically, the first base 410 is roughly cylindrical, and a through hole is provided on it for it to be sleeved and fixed on the outer periphery of the second end of the main shaft. However, in other embodiments, the structure of the second valve core stopper 42 is not limited to the above-mentioned claw structure, and can also be other structures, as long as the valve stem 51 of the one-piece fully welded ball valve can be clamped and fixed to prevent the valve stem 51 from swinging and vibrating during the turning process.

[0033] like Figure 1 and Figure 2 As shown, in some embodiments, the turning tool holder assembly 3 includes a turning base 30 and a turning tool holder 31, the turning base 30 is slidably connected to the machine tool base 1, and the turning tool holder 31 is fixedly connected to the turning base 30. That is, the turning base 30 can slide relative to the machine tool base 1, thereby changing the distance between it and the first end of the spindle. Before the cutting process begins, the turning base 30 and the first end of the spindle can be pulled apart by a certain distance to facilitate the disassembly and assembly of the first valve core stopper 41 or the integrated valve core valve stem structure 5 located at the first end of the spindle. After installing the first valve core stopper 41 or the integrated valve core valve stem structure 5, the turning tool holder 31 can be slid relative to the machine tool base 1 to one side of the first end of the spindle.

[0034] Furthermore, if Figure 1 and Figure 2As shown, in some embodiments, a first guide structure 11 is provided on the machine tool base 1, and a second guide structure is provided on the turning base 30. One of the first guide structure 11 and the second guide structure is a protruding slide rail, and the other is a recessed slide groove. The first guide structure 11 and the second guide structure are slidably matched. That is, in the same embodiment, the first guide structure 11 can be a slide rail and the second guide structure can be a slide groove; or the first guide structure 11 can be a slide groove and the second guide structure can be a slide rail. Specifically, as Figure 1 and Figure 2 In the illustrated embodiment, the turning base 30 is a hollow shell with an opening, and the turning base 30 is sleeved on the outer periphery of the machine tool base 1. The top surface of the machine tool base 1 is provided with a slide rail, and the surface of the turning base 30 facing the top surface of the machine tool base 1 is provided with a slide groove. Through the sliding cooperation between the slide rail and the slide groove, the turning base 30 can make a linear motion back and forth relative to the machine tool base 1 along the length direction of the slide rail.

[0035] Furthermore, if Figure 1 and Figure 2 As shown, in some embodiments, the valve core grinding device also includes a grinder that is detachably or non-detachably arranged on the turning base 30. The grinder is located on one side of the turning tool holder 31. The valve core after turning usually cannot reach the standard finish, so the valve core after turning basically cannot be used directly, and it is necessary to improve the surface finish of the valve core by grinding. Therefore, the grinder arranged on the turning base 30 is mainly used to improve the surface finish and dimensional accuracy of the valve core, remove materials to obtain a very smooth surface or meet specific dimensional requirements. Since the grinder is arranged on the turning base 30, the valve core can be immediately ground after turning the valve core, without the need to transfer the position of the valve core, which greatly improves the work efficiency. In summary, after the grinder is arranged on the turning base 30, the valve core grinding device of the utility model can perform the functions of turning and grinding, and the valve core can be turned and ground continuously on the device, without the need to transfer the position of the valve core, which is convenient for on-site use in nuclear power plants.

[0036] Furthermore, if Figure 1 and Figure 2As shown, in some embodiments, the grinding machine includes a grinding base 80, a grinding main machine 81 and a grinding disc 82, the grinding base 80 is detachably connected to the turning base 30, the grinding main machine 81 is fixedly connected to the grinding base 80, and the grinding disc 82 is transmission-connected to the grinding main machine 81. The grinding main machine 81 includes a driving motor, a transmission mechanism, etc. The grinding main machine 81 can be transmission-connected to the grinding disc 82 to drive the grinding disc 82 to rotate, thereby grinding the valve core after turning. Grinding adhesive-backed sandpaper can be installed on the grinding disc 82, and the grinding adhesive-backed sandpaper is in direct contact with the valve core and rubs against each other to achieve a grinding effect. The grinding machine for grinding the valve core is an existing mature technology, so the specific structure and working principle of the grinding machine can refer to the existing technology and will not be repeated here.

[0037] Furthermore, if Figure 1 and Figure 2 As shown, in some embodiments, a third guide structure 303 is provided on the turning base 30, and a fourth guide structure is provided on the grinding base 80, one of the third guide structure 303 and the fourth guide structure is a slide rail, and the other is a slide groove, and the third guide structure 303 and the fourth guide structure are slidably matched. That is, in the same embodiment, the third guide structure 303 can be a slide rail and the fourth guide structure can be a slide groove; or the fourth guide structure can be a slide groove and the third guide structure 303 can be a slide rail. Through the sliding cooperation of the third guide structure 303 and the fourth guide structure, the grinding base 80 can move relative to the turning base 30 along the length direction of the slide rail, so as to approach or move away from the turning base 30. When turning the valve core, the grinding base 80 can be first moved to a position away from the turning tool holder 31 to prevent the grinding base 80 from interfering with the turning tool. Alternatively, the grinding base 80 and the turning base 30 can also be detachably connected through the third guide structure 303 and the fourth guide structure. That is, in order to prevent the grinding base 80 from interfering with the turning tool, the grinding base 80 can also be directly removed from the turning base 30 .

[0038] Furthermore, if Figure 1 and Figure 2 As shown, in some embodiments, the valve core grinding device further includes an electric control box 9 connected to the spindle box 2. Specifically, the electric control box 9 is arranged on one side of the spindle box 2, and the electric control box 9 can also be arranged on the machine tool base 1. The electric control box 9 is equipped with a numerical control system for controlling the power of the drive component, etc., so as to realize the automatic control of the valve core processing process. The valve core turning machine with a numerical control system is also a mature prior art, and the setting of the electric control box 9 can also refer to the prior art, which will not be repeated here.

[0039] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A valve core grinding device, characterized in that: It comprises a machine tool base (1), a spindle box (2), a turning tool holder assembly (3), a spindle and a valve core limiting unit; The spindle box (2) and the turning tool holder assembly (3) are respectively arranged on the machine tool base (1), and the turning tool holder assembly (3) is located on one side of the spindle box (2); The spindle box (2) comprises a box body and a driving assembly arranged in the box body, the spindle is arranged in the box body and is in driving connection with the driving assembly, the spindle comprises a first end and a second end, the first end and the second end of the spindle are respectively located on opposite sides outside the box body, and the first end of the spindle is closer to the turning tool holder assembly (3) than the second end thereof, the spindle is a hollow structure, and the interior of the spindle defines a hollow area that passes through the first end and the second end thereof and is provided with a valve stem (51) of an integrated fully welded ball valve; The valve core limiting unit comprises a first valve core limiting member (41) and a second valve core limiting member (42), wherein the first valve core limiting member (41) is detachably connected to the first end of the main shaft, and the second valve core limiting member (42) is connected to the second end of the main shaft.

2. The valve core grinding device according to claim 1, characterized in that: The first valve core limiter (41) comprises a first base (410) and at least three first claws (411) arranged on the first base (410); the second valve core (62) of a common valve can be clamped between each of the first claws (411); and the first base (410) is detachably connected to the first end of the main shaft.

3. The valve core grinding device according to claim 2, characterized in that: The valve core grinding device further comprises a quick connection shaft (71), wherein the quick connection shaft (71) is sleeved on the outer periphery of the first end of the main shaft and is detachably connected to the first base body (410).

4. The valve core grinding device according to claim 1, characterized in that: The second valve core stopper (42) comprises a second base (421) and at least three second claws (422) arranged on the second base (421), and the valve stem (51) of the one-piece fully welded ball valve can be clamped between each of the second claws (422).

5. The valve core grinding device according to claim 1, characterized in that: The turning tool holder assembly (3) comprises a turning base (30) and a turning tool holder (31); the turning base (30) is slidably connected to the machine tool base (1), and the turning tool holder (31) is fixedly connected to the turning base (30).

6. The valve core grinding device according to claim 5, characterized in that: The machine tool base (1) is provided with a first guide structure (11), and the turning base (30) is provided with a second guide structure, one of the first guide structure (11) and the second guide structure is a slide rail, and the other is a slide groove, and the first guide structure (11) and the second guide structure are slidably matched.

7. The valve core grinding device according to claim 5, characterized in that: The valve core grinding device further comprises a grinder which is detachably or non-detachably arranged on the turning base (30), and the grinder is located on one side of the turning tool holder (31).

8. The valve core grinding device according to claim 7, characterized in that: The grinding machine comprises a grinding base (80), a grinding main machine (81) and a grinding disc (82); the grinding base (80) is detachably connected to the turning base (30); the grinding main machine (81) is fixedly connected to the grinding base (80); and the grinding disc (82) is transmission-connected to the grinding main machine (81).

9. The valve core grinding device according to claim 8, characterized in that: The turning base (30) is provided with a third guide structure (303), and the grinding base (80) is provided with a fourth guide structure. One of the third guide structure (303) and the fourth guide structure is a slide rail, and the other is a slide groove. The third guide structure (303) is slidably matched with the fourth guide structure.

10. The valve core grinding device according to claim 1, characterized in that: The valve core grinding device also includes an electric control box (9) connected to the spindle box (2).

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