A vibrating table structure for a block forming machine

Abstract

The present invention provides a vibration table structure for a block forming machine, including a base, a bridge installed on the base, a vibration table movably installed on the base, and a driving device for driving the vibration table to vibrate up and down, the bridges are two, the two bridges are arranged in parallel, the vibration table is located between the two bridges, the upper limit position of the vibration table when vibrating is higher than the upper surface of the bridge, and the lower limit position of the vibration table when vibrating is lower than the upper surface of the bridge. The vibration table structure of the present invention effectively reduces the weight of the vibration component because it does not need to set a support frame, the moment of inertia is relatively small, the energy consumption is relatively low, and there is no need to weld the support frame. The vibration table will not produce welding cracks and has a relatively long service life.

Description

Technical Field

[0001] The invention relates to a local structure of a block forming machine, in particular to a vibration table structure used for the block forming machine. Background Art

[0002] Block making machine, also known as brick machine, is a machine that produces new wall material blocks by adding a small amount of cement to materials such as fly ash, river sand, gravel, stone powder, fly ash, waste ceramsite slag, smelting slag, etc. The vibration table is the core component of the block making machine, which can drive the support plate and mold frame placed on the block making machine to vibrate up and down, so that the materials in the mold frame are densely formed into blocks.

[0003] The vibration table structure of the existing block forming machine usually includes a vibration table, a driving device for driving the vibration table to rotate up and down, a plurality of tray frames respectively fixedly connected to the table surface of the vibration table, and a bridge inserted between two adjacent tray frames. When in use, the tray is placed on the tray frame, and the mold frame is placed on the tray. The tray frame is driven by the vibration table, and then the tray is driven to lift up or clamp the bridge opposite to each other to achieve vibration. However, due to the existence of the tray frame, the weight of the vibration component in the vibration table structure is relatively large, the moment of inertia during vibration is also relatively large, and the energy consumption is relatively high. At the same time, because the tray frame needs to be welded on the vibration table, welding cracks are easily generated on the vibration table during the welding process, which affects the service life.

[0004] In view of this, the applicant conducted in-depth research on the vibration table structure used for block forming machines, which led to the present case. Summary of the invention

[0005] The object of the present invention is to provide a vibration table structure for a block making machine with relatively low energy consumption and relatively long service life.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A vibration table structure for a block forming machine comprises a base, a bridge installed on the base, a vibration table movably installed on the base, and a driving device for driving the vibration table to vibrate up and down, wherein there are two bridges, the two bridges are arranged in parallel, the vibration table is located between the two bridges, the upper limit position of the vibration table when vibrating is higher than the upper surface of the bridge, and the lower limit position of the vibration table when vibrating is lower than the upper surface of the bridge.

[0008] As an improvement of the present invention, a guide column is fixedly connected to the vibration table, a guide sleeve matching the guide column is fixedly connected to the base, and an elastic gasket is further provided between the lower surface of the vibration table and the base.

[0009] As an improvement of the present invention, the vibration table has a cavity, an eccentric shaft is rotatably connected in the cavity, one end of the eccentric shaft passes through the inner cavity and is transmission-connected to the driving device.

[0010] As an improvement of the present invention, the driving device includes a servo motor installed on the base, a transmission shaft connected to the output shaft of the servo motor, a universal coupling connected to the transmission shaft, the universal coupling is connected to the eccentric shaft, and the transmission shaft is rotatably connected to the base.

[0011] As an improvement of the present invention, the eccentric shaft and the bridge are arranged perpendicularly.

[0012] By adopting the above technical solution, the present invention has the following beneficial effects:

[0013] 1. The vibration table structure of the present invention does not require a support frame, which effectively reduces the weight of the vibration components, has a relatively small moment of inertia, and has a relatively low energy consumption. At the same time, there is no need to weld the support frame, the vibration table will not produce welding cracks, and has a relatively long service life.

[0014] 2. By adopting servo motors, the vibration table can be programmed to achieve strong vibration, weak vibration or no vibration, effectively shortening the production cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the front view of the vibration table structure used for the block forming machine of the present invention;

[0016] Figure 2 It is a side structural schematic diagram of the vibration table structure used for the block forming machine of the present invention.

[0017] The markings in the figure correspond to the following:

[0018] 10-base; 11-guide sleeve;

[0019] 20-bridge; 30-vibration table;

[0020] 31-guide column; 32-eccentric shaft;

[0021] 40-vibration device; 41-servo motor;

[0022] 42-transmission shaft; 43-universal coupling;

[0023] 50-elastic washer; 60-support plate;

[0024] 70-mold frame; 80-elastic limiting device. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 1-Figure 2 As shown, the vibration table structure for a block forming machine provided in this embodiment includes a base 10, a bridge 20 fixedly mounted on the base 10, a vibration table 30 movably mounted on the base 10, and a driving device 40 for driving the vibration table 30 to vibrate up and down, wherein there are two bridges 20, and the two bridges 20 are arranged flush, that is, the upper surfaces of the two are located on the same plane, and the vibration table 30 is located between the two bridges 20.

[0027] The fixed installation structure between the bridge 20 and the base 10 can be a conventional structure. In the present embodiment, the bridge 20 is in the shape of a gantry, and the lower ends of the two uprights of the gantry are fixedly connected to the base 10 by bolting or welding.

[0028] The vibration table 30 is fixedly connected with a guide post 31, and the base 10 is fixedly connected with a guide sleeve 11 that matches the guide post 31, so as to realize the movable connection between the vibration table 30 and the base 10 in turn. Of course, there are multiple guide posts 31 and guide sleeves 11, and the two are matched one to one. In addition, an elastic washer 50 is also arranged between the lower surface of the vibration table 30 and the base 10, which not only helps to brake the vibration table 30 moving in opposite directions, but also can provide a certain elastic force when the vibration table 30 starts to move upward, thereby reducing the burden of the driving device 40.

[0029] The structure of the driving device 40 and the transmission connection structure between the vibration table 30 and the driving device 40 can be conventional structures. Preferably, the vibration table 30 has a cavity, in which an eccentric shaft 32 is rotatably connected, one end of the eccentric shaft 32 passes through the inner cavity and is transmission-connected to the driving device 40, and the eccentric shaft 32 is arranged vertically to the bridge 20. Specifically, the driving device 40 includes a servo motor 41 mounted on the base 10, a transmission shaft 42 connected to the output shaft of the servo motor 41 through a conventional coupling, and a universal coupling 43 connected to the transmission shaft 42, and the universal coupling 43 is connected to the eccentric shaft 32, that is, the servo motor 41, the transmission shaft 42, the universal coupling 43 and the eccentric shaft 32 are connected in sequence, so that the servo motor 41 can be used to drive the eccentric shaft 32 to rotate, and the centrifugal force generated by the rotation of the eccentric shaft 32 can be used to drive the vibration table 30 to vibrate up and down. In addition, in this embodiment, the transmission shaft 42 is rotatably connected to the base 10 via a bearing to prevent the swing force of the universal coupling 43 from being transmitted to the servo motor 41. It should be noted that there can be multiple eccentric shafts 32 and drive devices 40, and the two can be connected in a one-to-one matching manner.

[0030] Of course, the vibration table structure provided in this embodiment also includes an elastic limit device 80. The structure of the elastic limit device 50 is exactly the same as the elastic limit device 80 on the conventional block forming machine, which is not the focus of this embodiment and will not be described in detail here. The upper limit position of the vibration table 30 when vibrating is higher than the upper surface of the bridge 20, and the lower limit position of the vibration table 30 when vibrating is lower than the upper surface of the bridge 20. In other words, when the vibration table 30 is in the upper limit position, the horizontal position of its upper surface is higher than the horizontal position of the upper surface of the bridge 20, and when the vibration table 30 is in the lower limit position, the horizontal position of its upper surface is lower than the horizontal position of the upper surface of the bridge 20.

[0031] The vibration table structure provided in this embodiment can replace the vibration table structure on a conventional block forming machine. When in use, a support plate 60 is placed on the vibration table 30 and each bridge 20 at the same time, and then the mold frame 70 is installed on the elastic limiting device 80, and the mold frame 70 is placed on the support plate 60, and then the material is laid. After the material is laid, the pressure head of the block forming machine is pressed tightly on the material in the mold frame 70, and the servo motor 41 is started at the same time to drive the vibration table 30 to vibrate to form blocks. In this process, the vibration table 30 will lift the support plate 60 and the mold frame 70 upwards, so that the support plate 60 and the bridge 20 are separated from each other, and then the vibration table 30 drops rapidly, so that the support plate 60 hits the bridge 20 under the action of gravity, completing a vibration action.

[0032] Compared with the vibration table of the conventional block forming machine, the area of ​​the vibration table provided in this embodiment is reduced by 1 / 3 due to the absence of a support frame. The vibration table does not need to undergo welding (i.e., there is no need to weld the support frame), and no welding cracks will be generated, which effectively increases the service life. More importantly, the absence of a support frame greatly reduces the load of the exciting force, increases the acceleration of the vibration system, and improves the performance of the block forming machine. Specifically, the vibration system is one of the core technologies of the block forming machine. For the same concrete formula, the acceleration of the vibration system of the forming machine has a great influence on the density and strength of the concrete products. Therefore, the design of the vibration system should try to increase the acceleration of the vibration system. The national standard for the acceleration of the forming machine is 8g (g=9.8m / s2), but the acceleration of foreign forming machines can reach 20g. The vibration table structure provided in this embodiment can greatly increase the acceleration of the vibration system. The specific increase can be verified by simple calculation:

[0033] The exciting force of the vibration system is generated by the centrifugal force generated by the eccentric wheel driven by the high-speed motor, which is a simple harmonic vibration.

[0034] Assume: the mass of the eccentric is m, the eccentric distance is A, that is, the distance between the center of mass of the eccentric and its axis of rotation is A. The rotation speed of the eccentric is n (rps), and the angular velocity of the eccentric is ω. ω=2πn.

[0035] The vibration displacement equation of the center of mass of a simple harmonic vibration is

[0036] X=Ainωt xmax=A

[0037] The vibration velocity equation of the center of mass is

[0038] V=ωAsin(ωt+π / 2) vmax=ωA

[0039] The vibration acceleration equation of the center of mass is

[0040] a=ω2Asin(ωt+π) amax=ω2A

[0041] Assume that the converted mass of each load is: the mass of the eccentricity and the box is m 心 , the mass of the vibration table is m 台 , the mass of the support frame on the vibration table is m 托 , the converted mass of concrete is mmix, the mass of the mold box is mmold, and the converted mass of the pressure head force is m 压 .

[0042] The total mass of the vibrating system is

[0043] m 系 =m 心 +m 台 +m 托 +m 混 +m 模 +m 压

[0044] This vibration system is a forced vibration and is a system that satisfies the conservation of momentum. Therefore, m×vmax=m 系 ×v 系 max

[0045] v 系max =(m×vmax) / m 系

[0046] Then: a 系 max=ωv 系 max=ω(m×vmax) / m 系 =ω2Am / m 系

[0047] It can be seen from the above formula that after the excitation parameters m, A and ω are determined, the acceleration of the vibration system depends on the total mass of the vibration system.

[0048] This embodiment aims to significantly increase the acceleration of the vibration system by reducing the total mass of the vibration system, thereby significantly improving the performance of the block making machine. Take the QT9 type block making machine as an example, which is a table vibration type 9 block making machine with an eccentric and box mass of m 心=200kg, the mass of the vibration table is m 台 =300kg,

[0049] The mass of the support frame on the vibration table is m 托 =250kg, the converted mass of concrete is m 混 =100kg, mold box mass mmold = 400kg, the converted mass of the pressure head force is mpressure = 0 ~ 450kg. The total mass of the vibration system is

[0050] m 系 =m 心 +m 台 +m 托 +m 混 +m 模 +m 压 =200kg+300kg+250kg+100kg+400kg+450kg

[0051] =1700kg.

[0052] When the excitation parameters are m = 42.5 kg, A = 15.84 mm and ω = 523.6 rad / s

[0053] QT9 type molding machine 系max =ω2Am / m 系 =523.62×0.01584×42.5 / 1700=108.524m / s2

[0054] (=11.08g)

[0055] The block forming machine of this patent has an eccentricity and a box body mass of mcenter = 200kg, and a vibration table mass of mtable = 200kg.

[0056] The mass of the support frame on the vibration table is 0, m 托 = 0kg, the converted mass of concrete is m 混 =100kg, mold mass m 模 =400kg, the converted mass of the pressure head force is m 压 =0~450kg. The total mass of the vibration system is

[0057] m 系 =m 心 +m 台 +m 托 +m 混 +m 压 =200kg+200kg+0kg+100kg+400kg+450kg=1350kg.

[0058] The molding machine of this patent 系max =ω2Am / m系 =523.62×0.01584×42.5 / 1350=136.713m / s2

[0059] (=13.95g).

[0060] When the pressure head force is 450kg, the present invention can increase the acceleration of the vibration system by 3g.

[0061] When the forming machine vibrates the blocks, the pressure head force is a variable. When the pressure head force is reduced to 0kg, a 系 max=ω2Am / m 系 =523.62×0.01584×42.5 / 950=194.276m / s2(=19.82g) is equivalent to 20g.

[0062] That is to say, by adopting the structure provided in this embodiment, the acceleration of the vibration system can be increased from 11g of QT9 type to 20g, reaching the international advanced level.

[0063] The present invention is described in detail above with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various modifications to the present invention based on the prior art, which all belong to the protection scope of the present invention.

Claims

1. A vibration table structure for a block forming machine, characterized in that: The invention comprises a base, a bridge installed on the base, a vibration table movably installed on the base and a driving device for driving the vibration table to vibrate up and down. There are two bridges, which are arranged in parallel. The vibration table is located between the two bridges. The upper limit position of the vibration table when vibrating is higher than the upper surface of the bridge, and the lower limit position of the vibration table when vibrating is lower than the upper surface of the bridge.

2. The vibration table structure for a block forming machine according to claim 1, characterized in that: A guide column is fixedly connected to the vibration table, a guide sleeve matched with the guide column is fixedly connected to the base, and an elastic gasket is further arranged between the lower surface of the vibration table and the base.

3. The vibration table structure for a block forming machine according to claim 1, characterized in that: The vibration table has a cavity, an eccentric shaft is rotatably connected in the cavity, one end of the eccentric shaft passes through the cavity and is transmission-connected to the driving device.

4. The vibration table structure for a block forming machine according to claim 3, characterized in that: The driving device comprises a servo motor mounted on the base, a transmission shaft connected to the output shaft of the servo motor, a universal coupling connected to the transmission shaft, the universal coupling is connected to the eccentric shaft, and the transmission shaft is rotatably connected to the base.

5. The vibration table structure for a block forming machine according to claim 4, characterized in that: The eccentric shaft is arranged perpendicularly to the bridge.

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