CN2472832Y

CN2472832Y - Automatic synchronous centering double clamp pipe drawing device

Info

Publication number: CN2472832Y
Application number: CN 01235462
Authority: CN
Inventors: 杜隆有; 姚锡凡; 陈生隘; 张城生; 古兴华
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2001-04-17
Filing date: 2001-04-17
Publication date: 2002-01-23
Anticipated expiration: 2011-04-17

Abstract

The utility model provides an automatic and synchronous centering double clamp pipe drawing device, which consists of a tube drawing vehicle, a tube drawing clamp, a casting mould and a synchronous controlling connecting device. The tube drawing clamp is arranged at the tube drawing vehicle. The synchronous controlling loop device is connected with the tube drawing clamp by the controlling signal pipeline; the tube drawing clamp is formed by connecting a clamp arm, a tight fixing nut, an adjusting nut, a rotating axis, a bracket, an oil tank, a bolt, an axis ear, a pin axis, a pulling rod, an alloy plate, an upper and lower clamp pawl and a chain plate. The utility model can make the double pipe clamp realize the synchronous centering, make the one time successful rate of the double clamp pipe drawing reach above the 95 percent to greatly improve the successful rate of pipe drawing.

Description

Two pincers pipe drawing devices of automatically synchronous centering

The utility model is two pincers pipe drawing devices of automatically synchronous centering, belongs to centrifugal casting apparatus.

The pipe drawing device of domestic and international single station or multistation centrifugal casting machine is general at present adopts one two pawl pincers, trielcon or multijaw pincers, centrifugal cast iron spare for small-bore (Φ 50mm～Φ 200mm), normal employing one is two pawls pincers or trielcon, and, usually when installing, equipment just the tube drawing pincers are adjusted to same center with casting mold, production is during with a kind of product of specification, this center need not adjust all the time again, only just can be with both centers centering again once when the product of conversion different size.Different with above-mentioned type is, our two casting mold centrifugal casting machines have two casting molds, and pipe drawing device must be joined two secondary tube drawings pincers, and two secondary tube drawings pincers must move simultaneously when ordinary production.If adopt existing above-mentioned pipe drawing device, difficulty will be compared in the center that each tube drawing all requires two secondary tube drawing pincers to aim at two casting molds simultaneously respectively, in actual production, often there is following several situation to occur: when 1. two pincers centers overlap with each self-corresponding casting mold center respectively, usually tube drawing is smooth, and No. one time the tube drawing success rate can reach 100%; When 2. two pincers centers were all higher or on the low side than the casting mold center of correspondence, tube drawing was not smooth, and a tube drawing success rate of this situation is almost nil; 3. ought be wherein the center of secondary pincers more higher or on the low side than corresponding casting mold center, center of another secondary pincers is more on the low side or higher or when overlapping, a tube drawing success rate of these five kinds of states is about 50% than corresponding casting mold center; More than a tube drawing success rate of several situations on average be about 30～35%, as seen, the efficient of a tube drawing success is lower.

The purpose of this utility model is exactly in order to overcome and solve general two pawls or the trielcon of adopting of tube drawing mechanism of existing centrifugal casting machine, and require two pincers to aim at difficulty of two casting mold centers simultaneously respectively, make the mean value of a tube drawing success rate in actual production only have 30～35%, shortcoming that success rate is lower and problem, two pincers pipe drawing devices of the automatically synchronous centering of a kind of pair of casting mold horizontal centrifugal casting machine of research and design, make the two secondary tube drawings pincers can synchronization actions and can adjust its center automatically and realize centering to two casting molds the mean value of a tube drawing success rate being brought up to more than 95%.

The utility model is realized by following technical proposals: the structural representation of two pincers pipe drawing devices of automatically synchronous centering as shown in Figure 1; Its single the structural representation of pipe wrench shown in Fig. 2～4; Its automatic centering principle schematic is shown in Fig. 5～7, and the synchronizing control loop apparatus structure schematic diagram of two pincers pipe drawing devices as shown in Figure 8.Automatically two pincers pipe drawing devices of centering are connected and composed jointly by tube drawing car 1, pipe wrench 2,3, casting mold 4,5 and synchronizing control loop device synchronously, its interconnected relationship is: pipe wrench 2,3 is installed on respectively above the tube drawing car 1, and the synchronizing control loop device is connected with pipe wrench 2,3 by

control signal pipeline

24,25; Wherein: pipe wrench 2 or 3 by tong arm 6, tighten up nut 7, adjustment screw 8, rotating shaft 9, carriage 10,

oil cylinder

11 or 35, bolt assembly 12, axle ear 13, Assembly of

14,16,19,20, pull bar 15, hard metal tip 17, go up chela plate 18, chain sheet 21, chela plate 22 connects and composes jointly down, its interconnected relationship is: an end of tong arm 6 is connected with tube drawing car 1 by rotating shaft 9 and is supported on above the carriage 10; The other end of tong arm 6 is connected with chain sheet 21 by Assembly of pin 20; Chain sheet 21 is connected to form gripper with upper and

lower chela plate

18,22, and gripper is connected with an end of pull bar 15 by Assembly of pin 16, and the other end of pull bar 15 is connected with oil cylinder 11 by axle ear 13; Oil cylinder 11 is fixed on the tong arm 6 by bolt assembly 12; Adjustment screw 8 is installed on above the carriage 10; The synchronizing control loop device of pipe drawing device is by pumping plant 31, a pressure valve 32, overflow valve 33,

reversal valve

30,34, one-

way throttle valve

26,27,28,29 and

pipeline

24,25 connect and compose jointly, and its interconnected relationship is: pumping plant 31 is connected with

reversal valve

30,34 with overflow valve 33 respectively; Overflow valve 33 is connected with a pressure valve 32;

Reversal valve

30,34 is connected with one-

way throttle valve

26,27,28,29; One-

way throttle valve

26 and 27 is connected in parallel; One-way throttle valve 28 be connected with the two ends of

oil cylinder

11,35 respectively by

pipeline

24,25 again after 29 are connected in parallel.

Automatic centering principle of the present utility model and synchronous working principle are as follows: this device automatic centering with the process of synchronous working is, the preceding gripper of tube drawing is in releasing orientation, and the center of gripper all is positioned at the below (see figure 5) at casting mold center; The hydraulic oil cylinder driving pull bar opens gripper during tube drawing, and chela at first touches the lower inner wall of foundry goods and compresses the foundry goods (see figure 6) gradually under gripper opens in the process; Then force the gripper center up to be moved, realize the left and right sides fine motion adjusting of horizontal direction simultaneously by between bearing pin 16 and the pull bar and the gap between bearing pin and the pin shaft hole, the centering of the direction that is up to the standard, up to the contact of last chela and when compressing on the foundry goods inwall, the center nature of two grippers overlaps (see figure 7) with each self-corresponding casting mold center.The driving oil cylinder of two tube drawings pincers is connected in parallel and 4 one-way throttle valves are set in oil piping system, make their the pincers speed of opening identical, the synchronization actions of two pincers also just solve; What the operation principle of this pipe drawing device was different with fixed tong arm is that this tong arm can be up and down within the specific limits.In opening the pincers process, in case chela is depressed into the foundry goods lower inner wall down, under the reaction force of foundry goods, tong arm just can and draw close the gripper center around skew on the axial rotary gradually to the casting mold center, till two centers overlap.As seen, by the effect of movable tong arm, gripper and casting mold can be finished mutual centering process automatically.This compares with the sort of fixed tong arm that can not regulate the center automatically, and in performance and use, the former wants much good and practical; Two pawl nippers are tungsten carbide buttons, and the hardness ratio hardness of grey iron of carbide alloy T8 is much higher, help gripper and sting tight foundry goods, and it can successfully be taken out from casting mold.And two pawl nippers and trielcon and multijaw nipper are relatively, obviously, structurally two pawls more simple, be more convenient for daily maintenance and loading and unloading.In addition, when the casting mold of displacement different size, only need replacing dewclaw nipper and chain sheet to get final product, also more or less freely and quick for the relative position of adjusting between two jaws and casting mold.This two pawls pincers more are adapted to produce small-bore (Φ 50mm～Φ 200mm) foundry goods, are particularly suitable for production weight is light, length is short iron drain-pipe and other sleeve class alloy-steel casting.

This installs the fine setting of available screw and since before opening pincers when gripper be centered close to the casting mold center above the time, open in the pincers process the interior upper wall that last chela can touch foundry goods in the casting mold than following chela earlier, casting mold is lifted, even the disengaging support roller causes the accident; Perhaps descend chela can not contact with the foundry goods inwall at all, cause the gripper center can't overlap with the casting mold center, last lower claw can not be stung tight foundry goods simultaneously, and foundry goods also can't take out.And when gripper is centered close to the casting mold below, can realize foregoing automatic centering process, so opening the preceding gripper center of pincers should be below the casting mold center.Adjustment screw is installed on the carriage, can by it regulate gripper center and casting mold center before tube drawing relative position and their vertical range is remained between more suitable 3～5 millimeters; The accurate distance of level is fixed between two pincers, and is well-known, and centering is determined by vertical direction and two parameters of horizontal direction.The up-down adjustment of tube drawing pincers vertical direction is mentioned in the above, repeats no more here.The spacings of two pincers horizontal directions are that the horizontal range according to two casting mold centers is adjusted in advance on the tube drawing car and is added on fixing.It is to realize regulating by the left and right sides fine motion of the gap between the gap between dewclaw nipper and the pull bar and bearing pin and the pin shaft hole in opening the pincers process that the centering of every secondary tube drawing pincers horizontal direction is regulated.Therefore, the automatic centering of this device is greatly simplified, production operation is more or less freely; Driving cylinder of the present utility model is connected in parallel.For two foundry goods in the casting mold can be taken out simultaneously, the oil cylinder that drives two secondary tube drawing pincers has adopted the method that is connected in parallel, and in oil piping system, be provided with 4 one-way throttle valves and be used to regulate their the pincers speed of opening, thereby solved the problem (see figure 8) of two pincers synchronization actions preferably; Two direction of pull unanimities of two tube drawings pincers, the driving force direction of these pincers tensioning is consistent with the tube drawing direction of pull, this helps chela fully to sting tight foundry goods inwall, reduces skidding, and foundry goods is taken out smoothly.

The utility model compared with prior art has following advantage and beneficial effect: the tube drawing pincers adopt different centering modes, and its tube drawing effect is made a world of difference.For example, when the center fixation of two tube drawings pincers, all can aim at casting mold center separately respectively owing to be difficult to guarantee in each tube drawing process two pincers centers, thereby the efficient of a tube drawing success is lower; When two tube drawings pincers adopted this centralising device, owing to can get rid of the situation that the former misaligns, the tube drawing success rate just greatly improved, and gripper center fixation and gripper automatic centering contrast situation see also following table 1:

Table 1

During the jaw center fixation, the relative position at jaw center and casting mold center		Tube drawing success rate (%)	Average efficiency (%)	During the jaw automatic centering, the relative position at jaw center and casting mold center		Tube drawing success rate (%)	Remarks
								Pincers 1	Pincers 2	Pincers 1	Pincers 2
The top	The top			0～10	30～ 35			Pincers 1	Pincers 2	Pincers 1	Pincers 2	The top	The top		Can get rid of
The top	The top	The top	Centering	0～10		～50	The top	Centering		Can get rid of		The top	The top		Can get rid of
The top	The below	The top	Centering	Almost zero		～50	The top	Centering		Can get rid of	The top	The below		Can get rid of
The top	The below	Centering	The top	Almost zero		～50	Centering	The top		Can get rid of	The top	The below		Can get rid of
Centering	Centering	Centering	The top	100		～50	Centering	The top		Can get rid of	Centering	Centering	100
Centering	Centering	Centering	The below	100		＜50	Centering	The below		Can get rid of	Centering	Centering	100
The below	The top	Centering	The below	Almost zero		＜50	Centering	The below		Can get rid of	The below	The top		Can get rid of
The below	The top	The below	Centering	Almost zero		＜50	The below	Centering		Can get rid of	The below	The top		Can get rid of
The below	The below	The below	Centering	Zero		＜50	The below	Centering		Can get rid of	The below	The below		Can get rid of

Below Figure of description is further specified as follows: Fig. 1 is the structural representations of two pincers pipe drawing devices of automatically synchronously centering, and Fig. 2～4th is single the structural representation of pipe wrench, wherein Fig. 3 be the A-A of Fig. 2 to view, Fig. 4 is that the B-B of Fig. 2 is to view; Fig. 5～Fig. 7 is the automatic centering situation schematic diagram of this device, and wherein: Fig. 5 is that the pipe wrench gripper is centered close to casting mold central lower situation schematic diagram; Fig. 6 is that down chela at first touches foundry goods lower inner wall and measuring phase schematic diagram gradually; Fig. 7 is that pipe wrench gripper center overlaps the situation schematic diagram with the casting mold center; Fig. 8 is the synchronizing control loop apparatus structure schematic diagram of pipe drawing device.Among each figure: the 1st, tube drawing car, the 2, the 3rd, pipe wrench, the 4, the 5th, casting mold, the 6th, tong arm, the 7th, tighten up nut, the 8th, adjustment screw, the 9th, rotating shaft, the 10th, carriage, the 11, the 35th, oil cylinder, the 12nd, bolt assembly, the 13rd, an ear, the 14,16,19, the 20th, Assembly of pin, the 15th, pull bar, the 17th, hard metal tip, the 18th, last chela plate, the 21st, chain sheet, the 22nd, following chela plate, the 23rd, foundry goods.24, the 25th, pipeline, the 26,27,28, the 29th, one-way throttle valve, the 30, the 34th, reversal valve, the 31st, pumping plant, the 32nd, play the pressure valve, the 33rd, overflow valve.

Embodiment of the present utility model can be as follows: (1) presses Fig. 1～shown in Figure 4, design, process, make or order, choose each parts, for example, the all available machine-tooled method processing and manufacturing of these parts, but tong arm 6 A3 steel, rotating shaft 9 can select for use the 35# steel to make, and tube drawing car 1 can select for use the A3 steel to be welded; Carriage 10 can be made with the A3 steel, bearing

14,16,19,20 can be made with the 35# steel, chain sheet 21 can be made with the 45# steel, upper and

lower nipper

18,22 can be made with the A3 steel, pull bar 15 can be made with the A3 steel, axle ear 13, bolt assembly 12, all available A3 steel of adjustment screw 8 are made, oil cylinder 11 can be ordered by required specification, and tightening up nut 7 can choose by required specification in market; Processing and chosen each parts after, can be by shown in Fig. 1～4, and be connected and installed by the described interconnected relationship of top specification, just can implement this pipe drawing device; (2) by shown in Figure 8, the seamless steel pipe of

pipeline

24,25 optional Φ 18 * 3 specifications; One-

way throttle valve

26,27,28,29 optional LI-63B types;

Reversal valve

30,34 optional 22D ₂-63B type; Pumping plant 31 optional BZ100/y types; Play pressure valve 32 optional 22D ₂-10B type; Overflow valve 33 optional ECG-06B types;

Oil cylinder

11,35 optional Φ 63 * 50 specifications.By the described annexation of top specification connection is installed after having chosen each parts, just can be made into the synchronizing control loop device of pipe drawing device, described by top specification again, synchronizing control loop device and tube drawing pincers are connected, through simple debugging, just can implement the utility model preferably again.The inventor has produced the utility model model machine through in a few years research, design, test in machinery plant of South China Science ﹠ Engineering University, respond well through do the application test on the sewage pipe centrifugal casting machine, has reached the purpose of the utility model design.

Claims

1, a kind of two pincers pipe drawing devices of automatically synchronous centering, it is characterized in that: it is connected and composed jointly by tube drawing car (1), pipe wrench (2), (3), casting mold (4), (5) and synchronizing control loop device, its interconnected relationship is: pipe wrench (2), (3) are installed on respectively above the tube drawing car (1), and the synchronizing control loop device is connected with pipe wrench (2), (3) by control signal pipeline (24), (25); Wherein: pipe wrench (2) or (3) by tong arm (6), tighten up nut (7), adjustment screw (8), rotating shaft (9), carriage (10), oil cylinder (11) or (35), bolt assembly (12), axle ear (13), Assembly of pin (14), (16), (19), (20), pull bar (15), hard metal tip (17), go up chela plate (18), chain sheet (21), chela plate (22) connects and composes jointly down, its interconnected relationship is: an end of tong arm (6) is connected with tube drawing car (1) by rotating shaft (9) and is supported on above the carriage (10); The other end of tong arm (6) is connected with chain sheet (21) by Assembly of pin (20); Chain sheet (21) is connected to form gripper with upper and lower chela plate (18), (22), and gripper is connected by the end of Assembly of pin (16) with pull bar (15), and the other end of pull bar (15) is connected with oil cylinder (11) by axle ear (13); Oil cylinder (11) is fixed on the tong arm (6) by bolt assembly (12); Adjustment screw (8) is installed on above the carriage (10).

2, press two pincers pipe drawing devices of the described a kind of automatically synchronous centering of claim 1, it is characterized in that described synchronizing control loop device by by pumping plant (31), play pressure valve (32), overflow valve (33), reversal valve (30), (34), one-way throttle valve (26), (27), (28), (29) and pipeline (24), (25) connect and compose jointly, and its interconnected relationship is: pumping plant (31) is connected with reversal valve (30), (34) with overflow valve (33) respectively; Overflow valve (33) is connected with a pressure valve (32); Reversal valve (30), (34) are connected with one-way throttle valve (26), (27), (28), (29); One-way throttle valve (26) is connected in parallel with (27); One-way throttle valve (28) be connected with the two ends of oil cylinder (11), (35) respectively by pipeline (24), (25) again after (29) are connected in parallel.