A spindle dynamic balancing mechanism and a punch press having the same

Abstract

The present invention relates to a spindle dynamic balancing mechanism and a punching machine having the same. The spindle dynamic balancing mechanism comprises a spindle, an eccentric wheel and a dynamic balancing wheel. The eccentric wheels are provided with at least two and are assembled and fixed between the two ends of the spindle at intervals along the axial direction. The dynamic balancing wheels are provided with at least two groups and correspond to the eccentric wheels one by one. Each group of dynamic balancing wheels is provided with at least two and are assembled and fixed on the spindle after axial superposition and close to the corresponding eccentric wheel. Advantages: It is practical for on-site dynamic balancing of the whole machine, and there is no need to separate the spindle accessories one by one for dynamic balancing. The dynamic balancing using the balancing mechanism is high in precision, simple, fast and convenient, and improves work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of punching machines, and in particular to a spindle dynamic balancing mechanism and a punching machine having the same. Background Art

[0002] The traditional punch press spindle dynamic balancing process is to separate all the parts on the spindle for dynamic balancing one by one and then assemble them. After assembly, the whole body is generally not balanced. In addition, the spindle dynamic balancing process is to perform dynamic balancing by punching holes to reduce weight or welding to increase weight on the spindle or spindle accessories. This process has the following disadvantages:

[0003] It is cumbersome, time-consuming, labor-intensive, and has poor mechanical balancing accuracy, which affects the strength of important components and the aesthetic appearance. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a spindle dynamic balancing mechanism and a punching machine having the same, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A spindle dynamic balancing mechanism comprises a spindle, an eccentric wheel and a dynamic balancing wheel. At least two eccentric wheels are provided and are assembled and fixed between the two ends of the spindle at intervals along the axial direction. At least two groups of dynamic balancing wheels are provided and correspond one-to-one with the eccentric wheels. Each group of dynamic balancing wheels has at least two dynamic balancing wheels and are assembled and fixed on the spindle after axial overlap and close to the corresponding eccentric wheels.

[0007] Furthermore, there are twelve assembly holes.

[0008] Furthermore, the above-mentioned assembly hole is a threaded hole, and the above-mentioned balancing member is a balancing screw adapted to the above-mentioned assembly hole, and the detachable thread of the balancing screw is installed in the corresponding above-mentioned assembly hole.

[0009] Furthermore, the eccentric wheel is connected to the main shaft by a key pin or an interference fit.

[0010] Furthermore, a plurality of axial weight-reducing holes are provided at intervals along the circumference of half of the dynamic balancing wheel, and the plurality of weight-reducing holes together constitute the hollow structure.

[0011] Furthermore, there are five weight-reducing holes, which are evenly spaced along the circumference of the dynamic balancing wheel. The diameter of the middle weight-reducing hole is larger than the diameters of the remaining four weight-reducing holes, and the diameters of the remaining four weight-reducing holes gradually decrease from the middle one to both sides.

[0012] The beneficial effects of the present invention are as follows: the present invention is applicable to on-site dynamic balancing of the whole machine, and it is unnecessary to separate the spindle accessories one by one for dynamic balancing. The dynamic balancing performed by the balancing mechanism is high in precision, simple, fast and convenient, and the work efficiency is greatly improved.

[0013] A punching machine is also provided, comprising a main shaft dynamic balancing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural assembly diagram of the main shaft dynamic balancing mechanism of the present invention;

[0015] Figure 2 It is a schematic structural diagram of a dynamic balancing wheel in the main shaft dynamic balancing mechanism of the present invention.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1. Main shaft; 2. Eccentric wheel; 3. Dynamic balancing wheel; 31. Assembly hole; 32. Weight reduction hole. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] Embodiment 1

[0020] like Figure 1 and 2 As shown, this embodiment is suitable for "static balancing" and "coarse dynamic balancing" of the spindle. Static balancing is suitable for applications with low speed. Coarse dynamic balancing is suitable for applications with low speed and low balancing accuracy requirements, specifically:

[0021] The main shaft dynamic balancing mechanism of this embodiment includes a main shaft 1, an eccentric wheel 2 and a dynamic balancing wheel 3. The above-mentioned eccentric wheels 2 are provided with at least two, and are assembled and fixed between the two ends of the above-mentioned main shaft 1 along the axial interval. The above-mentioned dynamic balancing wheels 3 are provided with at least two groups, and correspond to the above-mentioned eccentric wheels 2 one by one. Each group of the above-mentioned dynamic balancing wheels 3 is provided with at least two, and are assembled and fixed on the above-mentioned main shaft 1 after axial overlap, and are close to the corresponding eccentric wheels 2.

[0022] The initial composite unbalanced mass of the eccentric wheel 2 on the main shaft 1 is M 1 , whose unbalanced distance is e 1， And the initial synthetic imbalance H = M 1 ×e 1 The initial composite unbalanced mass of the above-mentioned single dynamic balancing wheel 3 on the main shaft 1 in each group is M 2 (It can also be the initial unbalanced mass of other accessories at the corresponding positions of the eccentric wheel 2 and the main shaft 1), the unbalanced distance is e 2， And the initial synthetic imbalance H2 =M 2 ×e 2 The combined unbalanced mass of each group of dynamic balancing wheels 3 is M 3 , the composite imbalance distance is e 3， And the synthetic unbalance H 3 =M 3 ×e 3 The line between the center of mass of each group of dynamic balancing wheels 3 and the axis of the main shaft 1 and the line between the center of mass of the eccentric wheel 2 and the axis of the main shaft 1 are 180° to each other.

[0023] This embodiment is applicable to the following two types of spindle balance adjustments:

[0024] 1) "Static balancing" is applicable to the spindle rotating at a low speed, and meets H3≈H1<H2 / n. In actual operation, static balancing can be achieved without the help of instruments. n is the number of dynamic balancing wheels in each set of dynamic balancing wheels.

[0025] 2) To do "rough dynamic balancing", the implementation plan is to synthesize the unbalance vector by finely adjusting the phase angle or phase of each group of dynamic balancing wheels 3 on the basis of good static balancing, so that it is close to the initial unbalance vector of the eccentric wheel 2 on the main shaft 1, and can achieve dynamic balance within a certain speed range. It is suitable for medium-speed rotating main shafts. In actual operation, rough dynamic balancing can be completed with the help of dynamic balancing instruments, and it can be omitted if the main shaft speed is not too high.

[0026] It should be noted that: the unbalanced mass of each dynamic balancing wheel 3 is the weight difference (absolute value) of the two halves after being equally divided with the respective centroid as the center, and the unbalanced distance is equal to the distance between the center of gravity and the centroid, wherein "the perpendicular line between the center of gravity of each group of the above-mentioned dynamic balancing wheels 3 and the axis of the above-mentioned main shaft 1 and the perpendicular line between the center of gravity of the above-mentioned eccentric wheel 2 and the axis of the above-mentioned main shaft 1 are 180° to each other" is specifically explained as follows: the center of gravity of each group of dynamic balancing wheels 3 after being combined is on one side of the main shaft 1, and the center of gravity of the corresponding eccentric wheel 2 is on the other side of the main shaft 1, and the two center of gravity points fall on the same plane passing through the axis of the main shaft 1 (that is, the phases are opposite).

[0027] Among them, the above-mentioned dynamic balancing wheel 3 is a circular wheel body, and is sleeved on the outside of the above-mentioned main shaft 1. Half of its circular ring is provided with a hollow structure. On the outer periphery of the above-mentioned dynamic balancing wheel 3, at least three assembly holes 31 extending along its radial direction are arranged at equal intervals along its circumference. The assembly holes 31 are through-threaded holes or through-step threaded holes (small inside and large outside). A locking screw is arranged in the assembly hole 31. The threaded section of the locking screw passes through the assembly hole 31 and is locked and connected with the main shaft 1 to fix the dynamic balancing wheel 3 and the main shaft 1.

[0028] In this embodiment, when dynamic balancing is performed, the phases of at least two dynamic balancing wheels 3 in each group are adjusted to reach a rough dynamic balancing state with the corresponding eccentric wheel 2, so that the dynamic balancing wheel 3 is fixed to the main shaft 1. Specifically, the dynamic balancing wheel 3 and the main shaft 1 are fixedly connected by locking screws in their assembly holes 31. When the locking screws are loosened, the phase of the dynamic balancing wheel 3 relative to the eccentric wheel 2 can be adjusted arbitrarily. The dynamic balancing mechanism of this embodiment is practical for on-site dynamic balancing of the whole machine. There is no need to separate the spindle accessories one by one for dynamic balancing. After all accessories are installed, only one on-site dynamic balancing of the whole machine can achieve more accurate balancing accuracy, which greatly improves work efficiency. The dynamic balancing of the entire mechanism is simple, fast, convenient and accurate. It solves the problem that the work of adding weight and reducing weight during dynamic balancing in traditional processes is too cumbersome.

[0029] More specifically, the greater the number of the assembly holes 31 (dividing holes), the better the effect of fine balancing of the entire mechanism. Generally, the number of the assembly holes 31 (dividing holes) is designed to be more than twelve, and the specifications are consistent.

[0030] Embodiment 2

[0031] This embodiment is suitable for "fine dynamic balancing" of the spindle. Fine dynamic balancing is to perform precise dynamic balancing on the basis of rough balancing. It is suitable for occasions with high speed and high balancing accuracy requirements. Specifically:

[0032] On the basis of the first embodiment, a balancing member is added, and the balancing member can be detachably assembled in any one or more of the assembling holes 31 according to actual adjustment needs, so as to finally achieve overall fine balancing adjustment with relatively high accuracy.

[0033] As a preferred embodiment, the above-mentioned assembly hole 31 is a threaded hole, and the above-mentioned balancing piece is a machine screw adapted to the above-mentioned assembly hole 31, and the detachable thread of the machine screw is installed in the corresponding above-mentioned assembly hole 31.

[0034] In this embodiment, the balancing member adopts a conventional machine screw, which can be easily installed in the matching threaded hole 31, which is conducive to rapid addition and removal and shortens the dynamic balancing cycle.

[0035] The implementation method of fine dynamic balancing of the spindle is to add or subtract machine screws (balance parts) in the indexing holes (assembly holes 31) of a single dynamic balancing wheel 3 in each group by using the methods of component correction and polar coordinate correction. The more indexing holes (assembly holes 31 spaced evenly on the circumference of the dynamic balancing wheel 2), the higher the precision of fine dynamic balancing. It is suitable for high-speed rotating spindles and occasions with high balancing precision requirements. In actual operation, fine dynamic balancing can achieve fine dynamic balancing more accurately and faster with the help of a dynamic balancing instrument.

[0036] Based on the above two embodiments, the following optimization can be performed:

[0037] Generally, the eccentric wheel 2 is connected to the main shaft 1 by a conventional key pin or assembled by interference fit, and the eccentric position of the segregation wheel 2 cannot be moved.

[0038] As a preferred embodiment, half of the dynamic balancing wheel 3 is provided with a plurality of weight-reducing holes 32 axially penetrating the half along its circumference, and the plurality of weight-reducing holes 32 together constitute the hollow structure.

[0039] In this implementation, the hollow structure is simple in design and has a good effect.

[0040] More specifically, there are generally five weight-reducing holes 32, which are evenly spaced along the circumference of the dynamic balancing wheel 3. The diameter of the middle weight-reducing hole 32 is larger than the diameters of the remaining four weight-reducing holes 32, and the diameters of the remaining four weight-reducing holes 32 gradually decrease from the middle one to both sides (specifically, the middle one is larger, and the diameters of the two weight-reducing holes 32 distributed on both sides of the middle weight-reducing hole 32 gradually decrease).

[0041] The number of the lightening holes 32 may also be adapted according to the actual size of the dynamic balancing wheel 3 as long as the requirements of the high-precision dynamic balancing process can be met.

[0042] Optimally, the lightening hole 32 can be a through hole or a blind hole, and when the lightening hole 32 is a blind hole, the lightening hole 32 should be located on the side (i.e., the inner side) of the two adjacent dynamic balancing wheels 3 that are close to each other, which has a beautiful appearance and is safer.

[0043] Of course, the hollow structure may also be a sector ring hole provided on one half of the dynamic balancing wheel 3 , or other regular hole structures, or a groove, or a hollow inner cavity, etc., and the sector ring hole is provided coaxially with the dynamic balancing wheel 3 .

[0044] Embodiment 3

[0045] This embodiment provides a punching machine, including the spindle dynamic balancing mechanism in the first or second embodiment.

[0046] More specifically, the punching machine may be a screen punching machine.

[0047] Typically, a punching machine or screen punching machine is provided with two or more sets of dynamic balancing wheels 3 and eccentric wheels 2 (dynamic balancing components).

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A spindle dynamic balancing mechanism, characterized in that: The invention comprises a main shaft (1), an eccentric wheel (2) and a dynamic balancing wheel (3), wherein at least two eccentric wheels (2) are provided and are assembled and fixed between the two ends of the main shaft (1) at intervals along the axial direction, and at least two groups of dynamic balancing wheels (3) are provided and correspond to the eccentric wheels (2) one by one, and each group of dynamic balancing wheels (3) is provided with at least two eccentric wheels, which are assembled and fixed on the main shaft (1) after being axially overlapped and close to the corresponding eccentric wheel (2); the dynamic balancing wheel (3) is a circular ring-shaped wheel body and is sleeved outside the main shaft (1), and half of the circular ring is provided with a hollow knot The dynamic balancing wheel (3) is provided with at least three assembling holes (31) extending in the radial direction thereof at equal intervals on the outer circumference thereof, the assembling holes (31) being through threaded holes, the assembling holes (31) being provided with locking screws, the threaded sections of the locking screws passing through the assembling holes (31) being locked and connected with the main shaft (1) so that the dynamic balancing wheel (3) and the main shaft (1) are fixed; the assembling holes (31) are provided with twelve; and the dynamic balancing wheel (3) is further provided with a balancing piece, the balancing piece being detachably mounted in any one or more of the assembling holes (31).

2. A spindle dynamic balancing mechanism according to claim 1, characterized in that: The assembly hole (31) is a threaded hole, and the balancing piece is a machine screw adapted to the assembly hole (31), wherein the detachable thread of the machine screw is installed in the corresponding assembly hole (31).

3. A spindle dynamic balancing mechanism according to claim 1, characterized in that: The eccentric wheel (2) is connected to the main shaft (1) by a key pin or an interference fit.

4. A spindle dynamic balancing mechanism according to any one of claims 1 to 3, characterized in that: Half of the dynamic balancing wheel (3) is provided with a plurality of axial weight-reducing holes (32) at intervals along its circumference, and the plurality of weight-reducing holes (32) together form the hollow structure.

5. A spindle dynamic balancing mechanism according to claim 4, characterized in that: The weight-reducing holes (32) are provided with five holes and are evenly spaced along the circumference of the dynamic balancing wheel (3); the diameter of the middle weight-reducing hole (32) is larger than the diameters of the remaining four weight-reducing holes (32); and the diameters of the remaining four weight-reducing holes (32) gradually decrease from the middle to both sides.

6. A punching machine, characterized in that: It comprises a spindle dynamic balancing mechanism as claimed in any one of claims 1 to 5.

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