A nut bidirectional locking device and combined roller

Abstract

The present invention proposes a nut bidirectional locking device and a combined rolling roller, wherein the nut bidirectional locking device is used to clamp the accessory on the shaft, including a shaft shoulder, a locking nut, a driving mechanism and a fixing mechanism; the shaft shoulder is arranged in the middle of the shaft, and locking nuts are arranged at both ends of the shaft; the driving mechanism is used to drive the locking nut to lock the accessory on the shaft on both sides of the shaft shoulder; the fixing mechanism connects the shaft shoulder. Compared with the prior art, the locking device has the characteristics of high efficiency, simple and reliable structure, long service life and low cost, and is particularly suitable for applications where the locking space is narrow for multi-slicing rolling of bars and wires; the combined rolling roller adopts bidirectional locking to share the axial tightening force, so that the minimum tightening force on one side is reduced by 40%, which greatly improves the reliability of the combined rolling roller assembly, thereby improving the working ability of the combined rolling roller under the condition of narrow design locking space.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Chinese patent application CN202010849062.5, entitled “A nut bidirectional locking device and combined rolling roller”, filed on August 21, 2020. The entire contents of the above application are incorporated herein by reference. Technical Field

[0003] The invention relates to the technical field of roller processing, and in particular to a nut bidirectional locking device and a combined rolling roller. Background Art

[0004] Combined cemented carbide rolls are usually used for rolling of round bars and rebars made of high-strength, earthquake-resistant, special steel materials. Taking advantage of the good thermal conductivity, red hardness, heat fatigue resistance, wear resistance, and high strength of cemented carbide, cemented carbide is developed as the material for the outer layer of the roll. The combination of the cemented carbide outer layer and the high-toughness roll core not only maintains the excellent properties of the outer layer such as high hardness, high wear resistance, and heat crack resistance, but also can give full play to the high strength and high toughness of the core of the roll core, thereby achieving a good combination of the two materials, improving the comprehensive performance of the roll, ensuring the service life and high reliability of the roll, and improving the quality of the rolled material. Commonly used combinations of cemented carbide outer layer and high-toughness roll core are gluing, interference fit assembly, hydraulic nut locking, and CIC key locking of the mandrel and cemented carbide roll ring. The patent application with application number 201520589816.2 discloses a combined cemented carbide roll. Patent ZL201220292180.1 discloses a pre-tightening and locking device for clamping parts on a shaft. However, due to the complicated assembly and disassembly operations of the devices in Chinese Patent ZL201220292180.1 and Patent Application No. 201110107442.2, the assembly pressure is not constant, and the design space is insufficient, it is easy to cause low assembly reliability, reduced overall strength and quality of the product, reduced resistance to abnormal working conditions and working ability under large rolling, reduced combined connection strength, reduced service life, and increased production costs. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned prior art that the roller disassembly operation is complicated and the assembly pressure is not constant, the purpose of the present invention is to provide a nut bidirectional locking device, which can be used to assemble a roller with a nut bidirectional locking and has good assembly pressure stability.

[0006] The present invention provides a nut bidirectional locking device, which is used to clamp an accessory on a shaft, and includes a shaft shoulder, a locking nut, a driving mechanism and a fixing mechanism; the shaft shoulder is arranged in the middle of the shaft, and locking nuts are arranged at both ends of the shaft; the driving mechanism is used to drive the locking nut to lock the accessory on the shaft on both sides of the shaft shoulder; the fixing mechanism is connected to the shaft shoulder.

[0007] Preferably, the driving mechanism comprises a hydraulic torque wrench and a transition sleeve, one end of the hydraulic torque wrench is connected to the hydraulic station, and the other end of the hydraulic torque wrench is connected to the locking nut through the transition sleeve.

[0008] Preferably, the shape of the inner wall of the transition sleeve is consistent with the shape of the outer wall of the locking nut.

[0009] Preferably, a plurality of planes parallel to the axis of the shaft are arranged on the side surface of the shaft shoulder, and the fixing mechanism is tightly connected to the shaft shoulder by pressing the planes.

[0010] Preferably, the fixing mechanism comprises a base and a plurality of sets of tightening mechanisms arranged on the base, and the plurality of sets of tightening mechanisms are used to tighten the shaft shoulder.

[0011] Preferably, each set of the tightening mechanisms comprises a push rod and a push rod sleeve, the push rod sleeve is arranged on the base, and one end of the push rod passes through the sleeve to tighten the shaft shoulder.

[0012] Preferably, it also includes a support plate that can be fixedly arranged, and the base is arranged on the support plate.

[0013] The present invention adopts the principle of friction locking. The key component, the carbide roller ring, and the mandrel are connected without a key, and the components are locked by the friction between the end faces. The middle of the mandrel is made into a shoulder that is integrated with the mandrel, and the side of the shoulder is symmetrically provided with multiple planes as reaction force application points. The locking nuts are tightened from both ends of the mandrel, and a sufficiently large axial tightening force is applied by a hydraulic wrench to lock each component on the mandrel from both ends. The device has the characteristics of high efficiency, simple and reliable structure, long service life, and low cost, and is particularly suitable for applications where the locking space is narrow for multi-cut rolling of bars and wires.

[0014] The present invention also provides a combined rolling roller, comprising a core shaft, accessories and locking nuts, wherein a shoulder is provided in the middle of the core shaft, the accessories are sleeved on the core shaft on both sides of the shoulder, and the accessories include roller rings and spacer rings arranged at intervals; both ends of the core shaft are provided with external threads and locking nuts, and the locking nut and the shoulder clamp the accessories on the core shaft.

[0015] Preferably, the inner ring surface of the spacer ring is connected to the outer wall of the core shaft through a key and a keyway.

[0016] Preferably, the roller ring is connected to the outer wall of the mandrel without a key.

[0017] Preferably, the roller ring is made of cemented carbide material, and the spacer ring is made of modulated alloy structural steel.

[0018] The combined roller of the present invention adopts bidirectional locking to solve the problem of insufficient thread strength and locking failure caused by short thread engagement length. Bidirectional locking distributes the axial tightening force, so that the minimum unilateral tightening force is reduced by 40%, which greatly improves the reliability of combined roller assembly, thereby improving the working ability of combined rollers in the case of narrow design locking space. Under the condition of the same thread engagement length, the axial locking force is reduced by 40%, so that the thread strength meets the use requirements. When the design space is narrowed by 20%, the purpose of axially locking multiple carbide roller rings is achieved through bidirectional locking.

[0019] Compared with the prior art, the nut bidirectional locking device and the combined roller provided by the present invention have the following advantages:

[0020] 1. The nut bidirectional locking device has high combined connection strength and is widely used in applications with narrow design space (multiple cutting and rolling);

[0021] 2. Due to the high strength of the locking nut, it can prevent the locking nut from cracking and breaking, thereby greatly improving the reliability of assembly and improving the strength and quality of the product against abnormal working conditions;

[0022] 3. The combined connection strength of the combined rollers is high and easy to assemble and disassemble, with a simple structure and constant assembly pressure;

[0023] 4. The design space of the combined roll is increased by more than 20%, which can solve the problem of reduced overall strength and quality of the product due to insufficient design space and extend the service life of the combined roll;

[0024] 5. The combined roller adopts bidirectional locking to solve the problem of insufficient thread strength and locking failure caused by short thread engagement length. The bidirectional locking distributes the axial tightening force, reducing the minimum unilateral tightening force by 40%, greatly improving the reliability of the combined roller assembly, thereby improving the working ability of the combined roller in the case of narrow design locking space.

[0025] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the present invention can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The invention will be described in more detail below based on non-limiting examples and with reference to the accompanying drawings, in which:

[0027] Figure 1 It is a structural schematic diagram of a nut bidirectional locking device equipped with a core shaft and accessories provided in one embodiment of the present invention;

[0028] Figure 2 It is a top view of the nut bidirectional locking device;

[0029] Figure 3 It is a cross-sectional view of the shaft shoulder;

[0030] Figure 4 1. It is a schematic diagram of the locking nut structure;

[0031] Figure 5 It is a schematic structural diagram of a combined roller provided in one embodiment of the present invention;

[0032] Figure 6 A partial cross-sectional view of the combined roller.

[0033] Description of reference numerals:

[0034] 1. Hydraulic wrench; 2. Mandrel; 3. Upper locking nut; 4. Key; 5. Carbide roller ring; 6. Slider; 7. Spacer ring; 8. Push rod sleeve; 9. Shoulder; 10. Slider pad; 11. Push rod; 12. Base; 13. Support plate; 14. Accommodating space; 15. Lower locking nut; 16. Reaction force support surface; 17. Side of shoulder; 18. Transition sleeve. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below. Based on the specific implementation methods in the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] Figure 1 It is a structural schematic diagram of a nut bidirectional locking device; Figure 2 It is a top view of the nut bidirectional locking device. Figure 2 The drive mechanism and the shoulder are not shown. Figure 1 , Figure 2 As shown, the nut bidirectional locking device (hereinafter referred to as the locking device) provided in this embodiment is used to clamp the accessories on the shaft, and the locking device includes a shaft shoulder 9, a locking nut, a driving mechanism and a fixing mechanism. Among them, the shaft shoulder 9 is arranged in the middle of the shaft, and the two ends of the shaft are respectively provided with external threads adapted to the locking nut, and a locking nut is respectively provided at the two ends of the shaft; the number of accessories to be clamped on the shaft can be set to multiple, and the multiple accessories are respectively sleeved on the shaft on both sides of the shaft shoulder 9, and the accessories are located between the shaft shoulder 9 and the locking nut; the driving mechanism is used to drive the locking nut to lock the accessories; the fixing mechanism is connected to the shaft shoulder 9, and the shaft is fixed by fixing the shaft shoulder 9.

[0037] The driving mechanism includes a hydraulic torque wrench and a transition sleeve 18. The first end of the hydraulic torque wrench is connected to the hydraulic station through an oil pipe; the second end of the hydraulic torque wrench is connected to the transition sleeve 18, and then connected to the locking nut through the transition sleeve 18. The shape and size of the inner wall of the transition sleeve 18 correspond to the shape and size of the outer wall of the locking nut. Figure 4 The middle locking nut is a twelve-sided nut, and the shape of the inner wall of the corresponding transition sleeve 18 is a twelve-sided structure, and its size is adapted to the twelve-sided nut. The outer shape of the locking nut can be set to a polygon such as a hexagon, an octagon, a decagon, a twelve-sided, a fourteen-sided, etc. according to actual needs. The inner wall of the corresponding transition sleeve 18 can also be set to a polygon such as a hexagon, an octagon, a decagon, a twelve-sided, a fourteen-sided, etc.

[0038] The fixing device is used to fix the shoulder 9 on the shaft to transmit torque. The fixing mechanism includes a base 12 and multiple groups of tightening mechanisms arranged on the base 12, each group of tightening mechanisms includes a push rod sleeve 8 and a push rod 11, wherein the push rod sleeve 8 is provided with an internal thread, and the push rod 11 is provided with a corresponding external thread. The push rod 11 is arranged in the push rod sleeve 8, and the push rod 11 is rotated so that one end of the push rod 11 can pass through the push rod sleeve 8 to tighten the shoulder 9. In order to improve the applicability of the device, a slider 6 can be configured in the tightening mechanism, and the slider 6 is arranged between the push rod 11 and the fixed shoulder 9. The push rod 11 is selected so that it pushes the corresponding slider 6 to tighten the side 17 of the shoulder, so that the fixing mechanism and the shoulder 9 are tightly connected. The shape and size of the slider 6 can be determined according to the shape and size of the shoulder 9. For example, when the side surface 17 of the shoulder is a circumferential surface, the end surface of the slider 6 connected to the push rod 11 is set as a plane, and the end surface of the slider 6 connected to the shoulder 9 is set as an arc surface corresponding to the circumferential surface, thereby increasing the force-bearing area of ​​the shoulder 9 and improving the stability of the connection between the shoulder 9 and the fixing device. When the radial height of the accessories installed on both sides of the shoulder 9 is higher than the radial height of the shoulder 9, the shoulder 9 is concave relative to the accessories on both sides. At this time, the slider 6 can be set in a convex shape, and the smaller end of the convex can smoothly extend into the concave shoulder 9 to press against the shoulder 9. In another embodiment, in order to flexibly adjust the height of the slider 6, a slider pad 10 can also be set under the slider 6.

[0039] like Figure 2As shown, the base 12 is a square structure, and the middle part of the base 12 is provided with a receiving space 14 for receiving the shaft and the shoulder 9. In this embodiment, the receiving space 14 is a stepped hole that passes through the base 12 from top to bottom, wherein the upper hole is larger than the lower hole, and a step is formed in the stepped hole; four through holes that pass through the base 12 horizontally are symmetrically arranged on the hole wall of the upper stepped hole, and the tightening mechanism is provided with four groups, and a push rod sleeve 8 is fixedly arranged in each through hole. The push rod 11 is inserted into the push rod sleeve 8, and the push rod 11 is rotated so that one end of the push rod passes through the push rod sleeve 8 and extends into the stepped hole; the shaft to be assembled extends into the stepped hole in the middle part of the base 12 and the shoulder 9 is located in the upper hole of the stepped hole, and the slider 6 is placed on the step of the stepped hole and is located between the push rod 11 and the shoulder 9. Each push rod 11 is adjusted so that it pushes the corresponding slider 6 to tighten the side 17 of the shoulder, so that the fixing mechanism and the shoulder 9 form a tight connection.

[0040] by Figure 1 In terms of orientation, the two faces of the shoulder 9 perpendicular to the axis are called the end faces of the shoulder 9, and the outer circumferential face of the shoulder 9 parallel to the axis is called the side face 17 of the shoulder. In another embodiment, in order to improve the stability of the connection between the fixing mechanism and the shoulder 9, as shown in FIG. Figure 3 As shown, it is preferred that a plurality of planes parallel to the axis of the shaft are provided on the side surface 17 of the shaft shoulder, and the plurality of planes are symmetrically distributed relative to the axis, so that the shaft shoulder 9 has a square flat shape. These planes are the reaction force support surfaces 16 of the shaft shoulder 9, and the number of the planes is consistent with the number of groups provided by the tightening mechanism. The slider 6 is pushed by the push rod 11 to tighten the reaction force support surface 16 on the shaft shoulder 9, so that the fixing mechanism and the shaft shoulder 9 are tightly connected. At this time, one end of the slider 6 is connected to the push rod 11, and the other end is connected to the reaction force support surface 16 of the shaft shoulder 9.

[0041] In order to facilitate the fixed installation of the base 12, a support plate 13 that can be fixedly installed is also included, and the base 12 is installed on the support plate 13. Figure 1 As shown, the outer wall of the lower part of the base 12 is provided with a stepped boss, which is a non-circular structure with a larger upper part and a smaller lower part. Correspondingly, the support plate 13 is provided with a through hole that passes through its plate body from top to bottom. The shape and size of the through hole are adapted to the lower part of the stepped boss, and the lower part of the stepped boss is inserted into the through hole. Due to the structural limitation of the inner wall of the through hole, the base 12 can remain stationary without rotating under the action of the torque applied by the hydraulic torque wrench.

[0042] The shaft involved in the above embodiment may be a rolling mill core shaft 2 , and the accessories may be a cemented carbide roller ring 5 and a spacer ring 7 .

[0043] like Figure 1 , Figure 2As shown, when the nut bidirectional locking device of the present invention clamps the parts on the shaft, first, the mandrel 2 is vertically erected and inserted into the accommodating space 14 of the base 12, and the reaction force support surface 16 on the shaft shoulder 9 is pressed against the push rod 11 and the slide block 6 to fix the mandrel 2 on the base 12. Then, the carbide roller ring 5 and the spacer ring 7 are installed in sequence, and the upper locking nut 3 is tightened, and the transition sleeve 18 is installed on the upper locking nut 3, and the hydraulic torque wrench is hoisted on the transition sleeve 18. The hydraulic torque wrench is connected to the hydraulic station through an oil pipe, and the maximum pressure value of the hydraulic station is set to the required pressure value. According to the set pressure value, the hydraulic torque wrench generates a constant required torsional torque to act on the locking nut through the transition sleeve 18. Then start the hydraulic station to supply pressure oil, and use the hydraulic torque wrench to apply appropriate torque to tighten the upper locking nut 3, so that the mandrel 2 is stretched by axial tension or the thread of the mandrel 2 is elastically deformed, so that the accessory carbide roller ring 5 and the spacer ring 7 are subjected to a sufficiently large axial tightening force, and the friction between the carbide roller ring 5 and the spacer ring 7 makes the carbide roller ring 5 and the spacer ring 7 stationary relative to each other and thus fixed on the mandrel 2. The above assembly of the upper carbide roller ring 5 and the spacer ring 7 is completed. Turn the mandrel 2 upright and repeat the above assembly steps to complete the assembly of the lower carbide roller ring 5 and the spacer ring 7. When it is necessary to disassemble the mandrel 2 with a nut locking device, the upper locking nut 3 or the lower locking nut 15 can be disassembled by rotating the hydraulic torque wrench in the opposite direction to provide a reverse torsional torque, and then the carbide roller ring 5 and the spacer ring 7 are disassembled in turn.

[0044] The present invention also provides a combined rolling mill, including a core shaft 2, accessories and locking nuts. A shoulder 9 is provided in the middle of the core shaft 2. The accessories are sleeved on the core shaft 2 on both sides of the shoulder 9. The accessories include carbide roller rings 5 ​​and spacer rings 7 that are spaced apart so that at least one end face of the carbide roller ring 5 is tightly fitted with the end face of the spacer ring 7. External threads and locking nuts are provided at both ends of the core shaft 2. Tightening the locking nuts causes the carbide roller rings 5 ​​and the spacer rings 7 to be subjected to a sufficiently large axial tightening force, so that the accessories are clamped on the core shaft 2 by the locking nuts and the shoulder 9. There are at least two carbide roller rings 5 ​​and spacer rings 7, which can be set according to actual needs. Figure 5 , Figure 6As shown, there are four carbide roller rings 5 ​​and two spacer rings 7, and two carbide roller rings 5 ​​and one spacer ring 7 are sleeved on both sides of the shaft shoulder 9. On one side of the shaft shoulder 9, the spacer ring 7 is arranged between the two carbide roller rings 5, and the carbide roller ring 5 close to the shaft shoulder 9 is located between the shaft shoulder 9 and the spacer ring 7, and the two end faces of the carbide roller ring 5 are respectively connected to one end face of the shaft shoulder 9 and one end face of the spacer ring 7; and the other carbide roller ring 5 away from the shaft shoulder 9 is located between the spacer ring 7 and the locking nut, and the two end faces of the carbide roller ring 5 are respectively connected to the other end face of the spacer ring 7 and the end face of the locking nut. The inner ring surface of the spacer ring 7 is provided with a keyway, and a key 4 is provided at a position corresponding to the spacer ring 7 on the core shaft 2, and the spacer ring 7 is connected to the outer wall of the core shaft 2 through the key 4 and the keyway. Tightening the locking nut causes the carbide roller ring 5 and the spacer ring 7 to be subjected to a sufficiently large axial tightening force, and relying on the friction between the carbide roller ring 5 and the spacer ring 7, the carbide roller ring 5 and the spacer ring 7 are kept stationary relative to each other and thus fixed on the shaft.

[0045] In a preferred embodiment, the cemented carbide roller ring 5 is connected to the outer wall of the mandrel 2 without a key; the inner side surface where the cemented carbide roller ring 5 is connected to the outer wall of the mandrel 2 is configured to be a smooth surface.

[0046] In the above embodiment, the cemented carbide roller ring 5 can be made of cemented carbide material; the preparation material of the spacer ring 7 can be selected from tempered alloy structural steel, and the tempered alloy structural steel after tempering has machinability, high strength, and good toughness.

[0047] In the above scheme, due to the bidirectional locking, the axial locking force is reduced by 40% under the same thread engagement length, so that the thread strength meets the use requirements. When the design space is narrowed by 20%, the purpose of axially locking multiple hard alloy roller rings 5 ​​is achieved through bidirectional locking.

[0048] Finally, it should be noted that the above implementation modes and examples are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above implementation modes and examples, those skilled in the art should understand that they can still modify the technical solutions described in the above implementation modes or examples, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the implementation modes or examples of the present invention.

Claims

1. A nut bidirectional locking device for clamping an accessory on a shaft, characterized in that: It includes a shaft shoulder, a locking nut, a driving mechanism and a fixing mechanism; the shaft shoulder is arranged in the middle of the shaft, and locking nuts are arranged at both ends of the shaft; the driving mechanism is used to drive the locking nut to lock the accessories on the shaft on both sides of the shaft shoulder; the fixing mechanism is connected to the shaft shoulder; The fixing mechanism comprises a base and a plurality of groups of tightening mechanisms arranged on the base, the plurality of groups of tightening mechanisms are used to tighten the shaft shoulder, and a receiving space for accommodating the shaft and the shaft shoulder to extend into is arranged in the middle of the base.

2. The nut bidirectional locking device according to claim 1, characterized in that: The driving mechanism comprises a hydraulic torque wrench and a transition sleeve, one end of the hydraulic torque wrench is connected to the hydraulic station, and the other end of the hydraulic torque wrench is connected to the locking nut through the transition sleeve.

3. The nut bidirectional locking device according to claim 2, characterized in that: The shape of the inner wall of the transition sleeve is consistent with the shape of the outer wall of the locking nut.

4. The nut bidirectional locking device according to claim 1, characterized in that: A plurality of planes parallel to the axis of the shaft are arranged on the side surface of the shaft shoulder, and the fixing mechanism is tightly connected with the shaft shoulder by pressing the planes.

5. The nut bidirectional locking device according to claim 1, characterized in that: Each set of the tightening mechanisms includes a push rod and a push rod sleeve. The push rod sleeve is arranged on the base. One end of the push rod passes through the sleeve to tighten the shaft shoulder.

6. The nut bidirectional locking device according to claim 4, characterized in that: It also includes a support plate that can be fixedly arranged, and the base is arranged on the support plate.

7. A combined roller, characterized in that: It includes a core shaft, an accessory and a locking nut. A shoulder is provided in the middle of the core shaft. The accessory is sleeved on the core shaft on both sides of the shoulder. The accessory includes roller rings and spacer rings arranged at intervals. Both ends of the core shaft are provided with external threads and locking nuts. The locking nut and the shoulder clamp the accessory on the core shaft. A plurality of planes parallel to the axis of the shaft are provided on the side of the shoulder, and the plurality of planes are symmetrically distributed relative to the axis.

8. The combined roller according to claim 7, characterized in that: The inner ring surface of the spacer ring is connected to the outer wall of the core shaft through a key and a keyway.

9. The combined roller according to claim 7, characterized in that: The roller ring is connected to the outer wall of the mandrel without a key.

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