Precise distance adjusting mechanism of three-roller machine

Abstract

The utility model provides a three-roller machine precise distance adjusting mechanism which comprises an oil cylinder pressing mechanism and a submicron gap adjusting mechanism, and the oil cylinder pressing mechanism comprises a pressing arm seat, a hinged support, a hydraulic cylinder and a middle bearing seat; the submicron gap adjusting mechanism comprises a main swing arm, an auxiliary swing arm, an electric cylinder, a wedge block, a rotating check block, a fixing frame and a tension spring. The main swing arm and the auxiliary swing arm form a lever rotating assembly, the electric cylinder drives the wedge block to linearly slide to drive the lever rotating assembly to rotate and move, and therefore precise adjustment of the gap of the roll shafts of the three-roll machine is achieved. By means of the arrangement of the structure, the wedge block mechanism is ingeniously introduced into the distance adjusting mechanism while the lever principle is used, large-torque adjustment is achieved with small displacement, the length of a force arm does not need to be increased, the distance adjusting mechanism is further suitable for machines of different sizes, and precise adjustment of the roller distance of the machines can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of precision three-roller machines, relates to a submicron-level adjusting mechanism for the axis spacing of rollers of a three-roller machine, and particularly relates to a precision spacing adjusting mechanism for a three-roller machine. Background Art

[0002] For sub-micron high-precision three-roller mills, in addition to the rolling bearing clearance on the roller shaft affecting the accuracy of the three-roller mill, the spacing adjustment accuracy of the three-roller mill's rotating rollers is an important factor in determining the accuracy of the three-roller mill. Therefore, for micron-level high-precision three-roller mills, to ensure the accuracy of the three-roller mill, it is necessary to maximize the spacing adjustment accuracy between the three-roller mill's rotating rollers.

[0003] At present, there is no good way to precisely adjust the distance between the three-roller mill shafts on the market. Generally, in order to ensure the accuracy of the equipment, have reliable stability, and reduce the influence of the roller spacing accuracy in the three-roller mill, the following methods are used:

[0004] 1. For example, the patent document with announcement number CN207307947U discloses a precision-controlled three-roller grinding machine, in which the adjustment distance is adjusted using the lever principle, that is, power x power arm = resistance x resistance arm. In order to save effort and improve the adjustment accuracy of the roller spacing, the power arm is longer than the resistance arm. That is, changing the proportional relationship between the power arm and the resistance arm can achieve the purpose of saving effort or reducing the moving distance. However, if the mechanism is to be small and compact, the mechanism using the lever principle is inevitably unable to achieve this. Therefore, this adjustment method is difficult to implement on some equipment with insufficient space. In addition, the technical solution proposed in this patent document has the following shortcomings: 1. The fulcrum and the end force point of the lever principle are in direct hard contact (sliding friction). With the increase in frequency and duration of use, wear and tear will inevitably occur, resulting in a decrease in adjustment accuracy and distortion of the roller spacing, making it impossible to effectively implement precision adjustment; 2. Due to the long force arm, the force will produce plastic deformation, which will have a certain impact on precision control; 3. The length of the force arm is too long, which is not conducive to product space layout.

[0005] 2. For example, the patent document with application number CN202222804955 proposes a roller gap adjustment device for a three-roller mill. The solution of this adjustment device is to use the left and right rotation of the screw rod to simultaneously drive the two rollers to adjust the distance. This solution is very good in coarse adjustment and occasions where the grinding force is not large. However, due to the use of the left and right rotation adjustment method of the screw rod, the two rollers cannot be conveniently and accurately installed in the correct position during adjustment. This point is mainly reflected in the fact that it is not easy to ensure the distance between the three rollers. In addition, this solution does not take into account the backlash and axial movement of the entire system such as the screw rod and bearing. Therefore, the adjustment device does not realize the function of precise fine-tuning of the three-roller mill. Moreover, since the screw rod drives the two rollers at the same time, it is even more impossible to achieve the requirement of adjusting any distance (within a certain stroke) between the three roller axes.

[0006] Therefore, the existing three-roller machine shaft spacing precision adjustment method cannot accurately and conveniently adjust the spacing between the rollers, and cannot achieve the function of precision fine-tuning. Utility Model Content

[0007] In view of the above, it is necessary to provide a three-roller machine precision spacing adjustment mechanism, which cleverly introduces a wedge mechanism into it while using the lever principle, so as to achieve large torque adjustment with a smaller displacement without increasing the length of the lever arm, and is suitable for machines of different sizes and can enable the machine to achieve precise adjustment of the roller spacing.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is:

[0009] A three-roller mill precision gap adjustment mechanism, including a cylinder pressing mechanism and a sub-micron gap adjustment mechanism.

[0010] The oil cylinder clamping mechanism includes a pressure arm seat, a hinge seat, a hydraulic cylinder, and an intermediate bearing seat; the middle section of the pressure arm seat is connected to the roller shaft core of the side roller through a bearing, and the lower part of the pressure arm seat is rotatably connected to the main frame of the three-roller machine; the middle section of the intermediate bearing seat is connected to the roller shaft core of the main roller through a bearing, and the lower part of the intermediate bearing seat is rotatably connected to the main frame, and the upper part of the intermediate bearing seat is hinged to the fixed section of the hydraulic cylinder; the movable end of the hydraulic cylinder is hinged to the upper part of the pressure arm through the hinge seat;

[0011] The submicron gap adjustment mechanism includes a main swing arm, a secondary swing arm, an electric cylinder, a wedge, a rotating block, a fixed frame, and a tension spring; the middle section of the main swing arm is connected to the roller shaft core of the main roller through a bearing, the lower part of the main swing arm is rotatably connected to the main frame, the upper section of the main swing arm is provided with a fixed frame, and a rotating block is rotatably provided on the fixed frame, and the rotating block is provided on the side of the main swing arm facing the side roller; the middle section of the secondary swing arm is connected to the roller shaft core of the side roller through a bearing, and the lower part of the secondary swing arm is rotatably connected to the main frame, and the rotation center line is coaxial with the rotation center line of the main swing arm connected to the main frame It is arranged that an electric cylinder is installed on the upper part of the auxiliary swing arm; the movable end of the electric cylinder faces the main swing arm and is connected to the wedge block, the upper surface of the wedge block is slidably connected to the rotating stop block through a plane needle bearing, the upper surface of the wedge block is perpendicular to the rotating stop block, the upper surface and lower surface of the wedge block form an angle, the opening of the angle faces the electric cylinder, the lower surface of the wedge block is slidably connected to the auxiliary swing arm through a plane needle bearing, and the lower surface of the wedge block is parallel to the extension and contraction direction of the electric cylinder; one end of the tension spring is connected to the middle section of the main swing arm, and the other end is connected to the middle section of the auxiliary swing arm.

[0012] Preferably, the angle formed by the upper surface and the lower surface of the wedge block is no greater than 1°.

[0013] Preferably, an oil cylinder pressing mechanism and a sub-micron gap adjustment mechanism are provided between each side roller and the main roller.

[0014] Preferably, the two oil cylinder pressing mechanisms located on the same side of the side roller share a middle bearing seat.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The spacing adjustment mechanism provided by the present invention can realize roller spacing adjustment with a relatively simple mechanical structure. Among them, the sub-micron spacing adjustment mechanism used, the lever rotation assembly composed of the main swing arm and the auxiliary swing arm, and the adjustment method composed of the sliding wedge driven by the electric cylinder, have the following advantages over other existing spacing adjustment methods: rolling friction, high precision, low resistance, and low wear.

[0017] 2. The spacing adjustment mechanism of the utility model has a simple structure, low cost, does not require high-precision bearings, and only requires a small installation space, which can effectively reduce the overall size of the three-roller machine.

[0018] 3. The utility model cleverly introduces a wedge mechanism into it while using the lever principle, which can achieve the adjustment of large torque with a smaller displacement without increasing the length of the lever arm. When using this mechanism on machines of different sizes, precise adjustment of the roller distance can be achieved, and it has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the distance adjustment mechanism of the utility model.

[0020] Figure 2 It is a force analysis diagram of the wedge block of the utility model.

[0021] Figure 3 It is a partial cross-sectional view of the portion where the wedge is located in the submicron gap adjustment mechanism of the utility model.

[0022] Figure 4 It is a structural diagram of the oil cylinder pressing mechanism of the utility model.

[0023] Figure 5 This is a simplified installation diagram of the utility model installed on a three-roller machine.

[0024] Figure 6 This is the principle diagram of the three-roller machine's gap elimination and distance adjustment.

[0025] Description of main component symbols

[0026] In the figure: submicron gap adjustment mechanism 1, electric cylinder 101, auxiliary swing arm 102, wedge 103, rotation stop 105, fixed frame 106, gap adjustment bearing 107, tension spring 108, pin 109, main swing arm 110, cylinder clamping mechanism 2, pressure arm seat 201, hinge seat 202, hinge seat shaft 203, adjusting nut 204, hydraulic cylinder 205, intermediate bearing seat 206, support bearing 207, main frame 208, rotation fulcrum 209, side roller 3, main roller 4, roller 5, roller shaft core 6.

[0027] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] See also Figure 1-6 In a preferred embodiment of the present invention, a three-roller mill precision gap adjustment mechanism includes a cylinder pressing mechanism 1 and a sub-micron gap adjustment mechanism 2.

[0029] The oil cylinder clamping mechanism 2 includes a pressure arm seat 201, a hinge seat 202, a hydraulic cylinder 205, and an intermediate bearing seat 206. The middle section of the pressure arm seat 201 is connected to the roller shaft core of the side roller 3 through a bearing, which is called the support bearing 207 of the three-roller machine. The lower part of the pressure arm seat 201 is rotatably connected to the main frame 208 of the three-roller machine, and can be specifically connected by a pin; the middle section of the intermediate bearing seat 206 is connected to the roller shaft core of the main roller 4 through a bearing, which is also called the support bearing 207 of the three-roller machine. The lower part of the intermediate bearing seat 206 is rotatably connected to the main frame 208, and is also specifically connected by a pin. The upper part of the intermediate bearing seat 206 is hinged to the fixed section of the hydraulic cylinder 205; the movable end of the hydraulic cylinder 205 is hinged to the upper part of the pressure arm through the hinge seat 202, and the hinge seat 202 is rotatably connected to the pressure arm through the hinge seat shaft 203. In the present invention, the pressure arm and the intermediate bearing seat 206 can both rotate around the pin on the main frame 208, and the pin is the rotation fulcrum 209 of the two. The two rotate around the rotation fulcrum 209 under the action of the hydraulic cylinder 205, so that the side roller 3 and the main roller 4 can be tightly attached. However, only the two rollers of the side roller 3 and the main roller 4 are tightly attached, and the support bearings 207 on the two rollers do not eliminate the gap. For this reason, the present application provides a sub-micron gap adjustment mechanism 1.

[0030] In the present invention, the submicron gap adjustment mechanism 1 includes a main swing arm 110 , an auxiliary swing arm 102 , an electric cylinder 101 , a wedge block 103 , a rotating block 105 , a fixing frame 106 , and a tension spring 108 . The middle section of the main swing arm 110 is connected to the roller shaft core of the main roller 4 through a bearing, and the bearing is called a gap adjustment bearing 107. The lower part of the main swing arm 110 is rotatably connected to the main frame 208. The upper section of the main swing arm 110 is provided with a fixed frame 106, and a rotating stopper 105 is rotatably provided on the fixed frame 106. The rotating stopper 105 is provided on the side of the main swing arm 110 facing the side roller 3; the middle section of the auxiliary swing arm 102 is connected to the roller shaft core of the side roller 3 through a bearing, and the bearing is also called a gap adjustment bearing 107. The lower part of the auxiliary swing arm 102 is rotatably connected to the main frame 208, and the rotation center line is coaxial with the rotation center line of the main swing arm 110 connected to the main frame 208. It is preferred that the auxiliary swing arm 102 and the main swing arm 110 are connected through the same pin 10 9 is connected to the main frame 208, and the electric cylinder 101 is installed on the upper part of the auxiliary swing arm 102; the movable end of the electric cylinder 101 faces the main swing arm 110 and is connected to the wedge 103, and the upper surface of the wedge 103 is slidably connected to the rotating block 105 through a plane needle bearing, and the upper surface of the wedge 103 is perpendicular to the rotating block 105. The upper surface and lower surface of the wedge 103 form an angle, and the opening of the angle faces the electric cylinder 101, and the lower surface of the wedge 103 is slidably connected to the auxiliary swing arm 102 through a plane needle bearing, and the lower surface of the wedge 103 is parallel to the extension and contraction direction of the electric cylinder 101; one end of the tension spring 108 is connected to the middle section of the main swing arm 110, and the other end is connected to the middle section of the auxiliary swing arm 102.

[0031] That is, in the present invention, the submicron gap adjustment mechanism 1 is connected to the main roller 4 through the main swing arm 110 and the auxiliary swing arm 102, and the main swing arm 110 and the auxiliary swing arm 102 are coaxially connected to the main frame 208, so that the rotation connection center point of the main swing arm 110 and the roller axis core of the main roller 4 ( Figure 2 Point B in the figure), the rotation connection center point between the auxiliary swing arm 102 and the roller shaft core of the side roller 3 ( Figure 2 The rotation connection center point of the main swing arm 110 (auxiliary swing arm 102) and the main frame 208 ( Figure 2 The angle ∠AOB is adjustable. Specifically, electric cylinder 101 drives the linear sliding of wedge block 103, causing secondary swing arm 102 and primary swing arm 110 to rotate about the pin, thereby varying the distance between points A and B and achieving the desired ∠AOB adjustment. In other words, the angle ∠AOB changes as wedge block 103 moves forward and backward, and the distance between points A and B changes accordingly. Trigonometric relationships indicate that to achieve a minute distance between points A and B, the stroke of electric cylinder 101 should be 40-60 times its original stroke, making sub-micrometer distance adjustment easily achievable.

[0032] As we know, the bearings used in three-roller mills have clearance. To achieve submicron clearance adjustment, it is necessary to eliminate the internal clearance of the bearings. Therefore, the present invention installs both sides of the side rollers 3 on the pressure arm seat 201, and connects the auxiliary swing arm 102 on the outside through bearings. The auxiliary swing arm 102 is located on the outside of the pressure arm seat 201, and is relatively far away from the roller of the side roller 3 relative to the pressure arm seat 201. At the same time, the present invention also installs both sides of the main roller 4 on the intermediate bearing seat 206, and connects the main swing arm 110 on the outside of the intermediate bearing seat 206. Similarly, the main swing arm 110 is also located on the outside of the intermediate bearing seat 206, and is relatively far away from the roller of the main roller 4 relative to the intermediate bearing seat 206. When the hydraulic cylinder 205 of the cylinder clamping mechanism 2 drives the hinge seat 202 to move backward (that is, to the side where the main roller 4 is located), the distance between the side roller 3 and the main roller 4 is achieved by adjusting the extension distance of the wedge block 103 by the electric cylinder 101 of the sub-micron gap adjustment mechanism 1. When the rotating block 105 is pressed against the needle bearing and the wedge block 103, the force of the hydraulic cylinder 205 mainly acts on the side roller 3, and the force is in the direction of the main roller 4. At the same time, the wedge block 103 gives a force to the auxiliary swing arm 102, and the direction of this force is in the direction of the side roller 3. The two forces are balanced, which just offsets the internal clearance of the bearing, ensuring that the gap between the three rollers of the three-roller machine remains unchanged during operation.

[0033] The principle of distance adjustment of the present utility model is as follows: Figure 6-2 As shown in the schematic diagram, the inner ring of the support bearing 207 of the three-roller machine (the bearing connecting the pressure arm seat 201 and the side roller 3, called bearing A) is connected to the roller shaft core of the side roller 3, and the outer ring is connected to the output shaft of the hydraulic cylinder 205. The inner ring of the bearing connected to the intermediate bearing seat 206 and the main roller 4 (called bearing B) is connected to the roller shaft core of the three-roller machine, and the outer ring is connected to the submicron gap adjustment mechanism 1. The rollers of the side roller 3 and the main roller 4 are initially in a tightly fitted state. A certain external force Fa is initially applied to make the rollers tend to be in close contact (the external force Fa in this embodiment provides continuous force for the hydraulic cylinder 205), and the clearance between the bearing A and the roller shaft center will disappear, as shown in FIG. Figure 6-2 When the submicron gap adjustment mechanism 1 pushes the wedge 103 to make linear motion by the electric cylinder 101, first, the clearance of the bearing B will gradually decrease until it disappears. Figure 6-3 When the electric cylinder 101 continues to move linearly, the rollers of the side rollers 3 and the main rollers 4 will gradually separate when they are in close contact. Figure 6-4 When the rollers are separated by the submicron gap adjustment mechanism 1, the clearance between the support bearing 207 of the three-roller machine and the roller axis core will disappear. After the applied force is lost, the original state is restored. The submicron gap adjustment mechanism 1 of the utility model applies an external force to the roller axis core to keep the position of the support bearing 207 of the three-roller machine and the roller axis core at the same position. Figure 6-4 position, thus achieving precise distance adjustment.

[0034] As can be seen from the above, the submicron gap adjustment mechanism 1 of the present invention primarily utilizes the linear motion of the wedge 103 driven by the electric cylinder 101. This linear motion of the wedge 103, supported by the needle bearings (needle roller rows) on its upper and lower surfaces, partially forces the rotating block 105 outward, thereby driving the rotation of the lever rotation assembly (primary swing arm 110 and secondary swing arm 102), forcing the rollers to move away from one another, thereby achieving the purpose of adjusting the roller spacing. When the electric cylinder 101 reverses, the wedge 103 it drives and the lever rotation assembly are in a freely contacting state (the tension spring 108 constantly applies the force required to reset the rollers). Through the movement of the wedge 103 and the lever rotation assembly, precise adjustment of the gap between the rollers of the three-roller machine can be achieved. In this embodiment, the angle formed by the upper and lower surfaces of the wedge block 103 is preferably no greater than 1°. This makes the angle of the wedge block 103 extremely small. Combined with the excellent layout, it can perfectly convert long-distance linear motion into short-distance lever drive, directly improving the adjustment accuracy by two orders of magnitude. In addition, the extremely small angle also makes it possible to drive a large load with a small force. In other words, due to the introduction of the wedge block 103 structure in the present invention, the angle between the upper and lower surfaces of the wedge block 103 is less than 1°, resulting in a large component of the force normal to the direction of motion of the wedge block 103, while the force pushing the wedge block 103 is very small. This allows the original solution that requires a large space to implement the lever mechanism to be transformed into a simpler mechanism, better achieving the effects of large grinding force and precise fine adjustment.

[0035] Finally, it should be noted that preferably, a cylinder clamping mechanism 2 and a submicron gap adjustment mechanism 1 are provided between each side roller 3 and the main roller 4. Furthermore, the two cylinder clamping mechanisms 2 located on the same side of the side roller 3 share an intermediate bearing seat 206.

[0036] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A three-roller mill precision gap adjustment mechanism, comprising a cylinder pressing mechanism and a submicron gap adjustment mechanism, characterized in that: The oil cylinder clamping mechanism includes a pressure arm seat, a hinge seat, a hydraulic cylinder, and an intermediate bearing seat; the middle section of the pressure arm seat is connected to the roller shaft core of the side roller through a bearing, and the lower part of the pressure arm seat is rotatably connected to the main frame of the three-roller machine; the middle section of the intermediate bearing seat is connected to the roller shaft core of the main roller through a bearing, and the lower part of the intermediate bearing seat is rotatably connected to the main frame, and the upper part of the intermediate bearing seat is hinged to the fixed section of the hydraulic cylinder; the movable end of the hydraulic cylinder is hinged to the upper part of the pressure arm through the hinge seat; The submicron gap adjustment mechanism includes a main swing arm, a secondary swing arm, an electric cylinder, a wedge, a rotating block, a fixed frame, and a tension spring; the middle section of the main swing arm is connected to the roller shaft core of the main roller through a bearing, the lower part of the main swing arm is rotatably connected to the main frame, the upper section of the main swing arm is provided with a fixed frame, and a rotating block is rotatably provided on the fixed frame, and the rotating block is provided on the side of the main swing arm facing the side roller; the middle section of the secondary swing arm is connected to the roller shaft core of the side roller through a bearing, and the lower part of the secondary swing arm is rotatably connected to the main frame, and the rotation center line is aligned with the rotation center line of the main swing arm connected to the main frame The shaft is set, and an electric cylinder is installed on the upper part of the auxiliary swing arm; the movable end of the electric cylinder faces the main swing arm and is connected to the wedge block, the upper surface of the wedge block is connected to the rotating stop block through a plane needle bearing, the upper surface of the wedge block is set perpendicular to the rotating stop block, the upper surface and lower surface of the wedge block form an angle, the opening of the angle faces the electric cylinder, the lower surface of the wedge block is slidably connected to the auxiliary swing arm through a plane needle bearing, and the lower surface of the wedge block is parallel to the extension and contraction direction of the electric cylinder; one end of the tension spring is connected to the middle section of the main swing arm, and the other end is connected to the middle section of the auxiliary swing arm.

2. A three-roller mill precision distance adjustment mechanism according to claim 1, characterized in that: The angle formed by the upper surface and the lower surface of the wedge block is no greater than 1°.

3. The three-roller mill precision distance adjustment mechanism according to claim 1, characterized in that: An oil cylinder pressing mechanism and a submicron gap adjustment mechanism are provided between each side roller and the main roller.

4. A three-roller mill precision pitch adjustment mechanism according to claim 3, characterized in that: The two oil cylinder pressing mechanisms located on the same side of the side roller share a middle bearing seat.

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