CN103934326B - Processing equipment for small elbow of heat exchanger - Google Patents

Abstract

The invention discloses a processing method of a small elbow of a heat exchanger and processing equipment thereof. The processing method of a small elbow of a heat exchanger comprises the following steps: feeding, core rod advancing, bending, core rod retreating, sawing and unloading In the feeding step, increase the feeding length of the pipe, so that the length of the straight section at the end of the pipe after bending is greater than or equal to 20 mm. In the processing method of the small elbow of the heat exchanger of the present invention, by increasing the feeding length of the pipe material, the remaining straight section of the tail end after the small elbow is bent by 180° is increased, so as to achieve the purpose of reducing the beveled mouth of the pipe mouth, so that the sawing The straight section of the tail end that comes down can be utilized as a short pipe. Through the processing method of the small elbow of the heat exchanger of the present invention, the waste caused by sawing the beveled tailings is avoided, and the material utilization rate is improved; moreover, the parallel production of the small elbow and the short pipe is realized, and the production cycle is shortened. The production efficiency is improved, and the input of personnel and equipment is reduced.

Description

Processing equipment for small elbows of heat exchangers

technical field

The invention relates to air-conditioning accessories, in particular to a processing method and processing equipment for a small elbow of a heat exchanger.

Background technique

The small elbow (semi-circular tube) of the finned tube heat exchanger is a kind of copper tube product in the air-conditioning accessories. At present, the small elbow processing equipment for processing small elbows is very mature. The processing steps of the small elbow processing equipment are as follows : Clamping→copper tube feeding→core rod advancing→bending→core rod retreating→sawing→unloading→clamping..., and so on.

The disadvantage of this processing method is: since the straight section at the end of the copper tube is short (3-5mm), there will be a bevel in the straight section at the end of the copper tube after bending, so it needs to be sawed to make the nozzle of the small elbow round. Flush, while sawn tails create material waste.

In addition, more and more short copper pipes are required in the accessories of air conditioners, and the cutting of short copper pipes has always been a technical bottleneck for the existing chipless cutting machine.

Contents of the invention

Aiming at the current state of the art above, the technical problem to be solved by the present invention is to provide a method for processing small elbows in heat exchangers, which can produce short copper pipes while producing small elbows, and avoid sawing bevel tails. The resulting waste can improve the utilization rate of materials, shorten the production cycle and improve production efficiency.

Another technical problem to be solved by the present invention is to provide a processing equipment for small elbows of heat exchangers, which can produce short copper pipes while producing small elbows, avoiding the waste caused by sawing bevel tails, Improve material utilization, shorten production cycle, and improve production efficiency.

In order to solve the above technical problems, the present invention provides a method for processing small elbows in heat exchangers, which includes the following steps: feeding, mandrel feeding, bending, mandrel retreating, sawing and unloading. In the step, the feeding length of the pipe is increased so that the length of the straight end of the pipe after bending is greater than or equal to 20mm.

In one of the embodiments, the length of the straight section at the tail end is 22-50 mm.

In one of the embodiments, the straight end section is fixed before sawing.

In one of the embodiments, in the step of withdrawing the core rod, the core rod is partly withdrawn from the pipe, so that the straight end section is fixed by the core rod.

In one of the embodiments, the straight section of the tail end is fixed by a clamping mechanism.

A processing equipment for a small elbow of a heat exchanger provided by the present invention includes:

bending die;

A clamping mechanism, the clamping mechanism is fixed on one side of the bending die, and a gap for saw blades to enter is provided between the clamping mechanism and the bending die;

A bending mechanism, the bending mechanism is arranged on the other side of the bending die opposite to the mold clamping mechanism, the bending mechanism includes a connecting plate, a former, a core rod and a first driving device, the The master form is slidably arranged on the connecting plate along the vertical direction of the bending die axis, and has an initial position where the core rod is completely inserted into the pipe material and an end position where the core rod is completely withdrawn from the pipe material, and the core rod is fixed on On the former, the first driving device is used to drive the former;

Increase the stroke length between the initial position and the end position and the stroke length of the first driving device, so that the length of the straight section at the tail end after the pipe is bent is greater than or equal to 20mm.

In one of the embodiments, the length of the straight section at the tail end is 22-50 mm.

In one of the embodiments, the cam also has an intermediate position between the initial position and the end position, when the cam is at the intermediate position, the mandrel partially exits the pipe .

In one of the embodiments, the processing equipment for the small elbow of the heat exchanger further includes a material retaining flap, and the material retaining flap is arranged on the top surface of the clamping mechanism close to the end of the gap, and The material blocking flap includes a bottom plate arranged transversely and an upwardly extending flange arranged at an end of the bottom plate away from the gap.

In one of the embodiments, an elastic member is arranged between the material retaining flap and the mold clamping mechanism.

In one of the embodiments, the processing equipment for small elbows of heat exchangers further includes a clamping device, the clamping device includes a pressing block and a second driving device, the pressing block is movable, and has Clamping position and non-clamping position, when the pressing block is in the clamping position, the pressing block cooperates with the clamping mold upper seat of the clamping mold mechanism to fix the straight section of the tail end, and the The second driving device is used to drive the pressing block.

In one of the embodiments, the clamping device is installed on a side of the bending mechanism close to the bending die.

The processing method and processing equipment of the small elbow of the heat exchanger of the present invention increase the length of the pipe material to increase the remaining straight section of the tail after the small elbow is bent by 180°, so as to achieve the purpose of reducing the oblique opening of the nozzle. Therefore, the straight section of the tail end cut by sawing can be used as a short pipe, which avoids the waste caused by sawing the beveled tail material and improves the utilization rate of materials; moreover, it realizes the parallel production of small elbows and short pipes, shortening the The production cycle is improved, the production efficiency is improved, and the investment of personnel and equipment is reduced.

The beneficial effects of the additional technical features of the present invention will be described in the specific embodiments of this specification.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the processing equipment in one of the embodiments of the present invention;

Fig. 2 is the schematic diagram of the three-dimensional structure of the clamping mechanism of the processing equipment shown in Fig. 1;

Fig. 3 is a side view of Fig. 2;

Fig. 4 is the schematic diagram of the three-dimensional structure of the processing equipment in another embodiment of the invention;

FIG. 5 is a schematic perspective view of the three-dimensional structure of the bending mechanism of the processing equipment shown in FIG. 4 .

Explanation of Reference Signs: 1. Pipe material; 2. Straight end section; 3. Small elbow; 4. Clamp upper seat; 5. Clamp lower seat; 6. Gap; 7. Connecting plate; 8. Push plate; 9 , skateboard; 10, profiling; 11, oil cylinder; 12, core rod; 13, bending die; 14, base; 15, saw blade; 17, retaining folding plate; 17a, bottom plate; ; 19, pressing block; 20, cylinder; 21, fixed plate.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

The processing method of the small elbow of the heat exchanger of the present invention is the same as that of the prior art, and both include the following steps: feeding, core rod advancing, bending, core rod retreating, sawing and unloading. The processing method of the small elbow of the heat exchanger of the present invention is different from the prior art in that in the feeding step, the feeding length of the pipe 1 is increased so that the length of the straight section 2 of the tail end after the pipe 1 is bent is greater than or equal to 20 mm .

By increasing the feeding length of the pipe material 1, the remaining straight section 2 of the tail end after the small elbow 3 is bent by 180° is increased, so as to achieve the purpose of reducing the oblique opening of the nozzle. Experiments have proved that after the small elbow 3 is bent 180°, more than 20mm of the straight section is reserved, there is no obvious bevel, and the height difference of the nozzle is ≤0.5mm, so that the saw-cut tail end straight section 2 can be used as a short tube. Therefore, the processing method of the small elbow of the heat exchanger of the present invention avoids the waste caused by sawing the beveled tail material, improves the material utilization rate; moreover, realizes the parallel production of the short pipe and the small elbow 3, shortens the production Cycle, improve production efficiency, reduce the input of personnel and equipment.

The length of the straight section 2 at the tail end is preferably 22-50 mm. If the length of the straight section 2 at the tail end is within this range, only a slight modification is required on the basis of the existing processing equipment, and no parts need to be replaced, so as to reduce the cost of modification.

Since there is a batch edge that is difficult to handle after the straight section 2 of the tail end is cut off, the straight section 2 of the tail end is fixed before sawing. After the tail-end straight section 2 is fixed, it can avoid the problem of sharp edge caused by saw blade 15 empty cutting. The following two methods can be used to fix the straight section 2 of the tail end: one is to partially withdraw the core rod 12 from the pipe material 1 in the step of retreating the core rod so as to fix the straight section 2 of the tail end through the core rod 12 . The other is to fix the tail end straight section 2 by adding a clamping mechanism.

Fig. 1 is a schematic perspective view of the three-dimensional structure of the processing equipment for the small elbow of the heat exchanger in one embodiment of the present invention. As shown in the figure, the processing equipment for the small elbow of the heat exchanger in this embodiment includes: a base 14, a bending die 13, a mold clamping mechanism, a bending mechanism and a saw blade 15, wherein the base 14 is used to control the entire processing equipment Provide support. The bending die 13 is fixed on the base 14 . As shown in Figures 2 and 3, the die clamping mechanism is fixed on one side of the bending die 13, and a gap 6 for saw blades 15 to enter is provided between the die clamping mechanism and the bending die 13. Clamping mechanism comprises mold clamping upper seat 4 and clamping mold lower seat 5.

The bending mechanism is disposed on the other side of the bending mold 13 opposite to the mold clamping mechanism, and the bending mechanism can rotate 180° around the axis of the bending mold 13 . The bending mechanism includes a connecting plate 7, a former 10, a core rod 12 and a first driving device, and the former 10 is slidably arranged on the connecting plate 7 along the vertical direction of the axis of the bending die 13, And it has an initial position where the core rod 12 is fully inserted into the pipe material 1 and an end position where the core rod 12 is completely withdrawn from the pipe material 1, the core rod 12 is fixed on the master form 10, and the first driving device is used to drive the The former 10 slides between the initial position and the end position, the first driving device includes a slide plate 9, a push plate 8 and an oil cylinder 11, the former 10 is fixed on the slide plate 9, and the oil cylinder 11 The piston rod is connected with the slide plate 9 through the push plate 8. The stroke length of the former 10 and the oil cylinder 11 is such that the length of the straight section 2 at the end of the pipe 1 is greater than or equal to 20mm after bending. Preferably, the length of the straight section 2 at the tail end is 22-50 mm.

Preferably, the cam 10 also has an intermediate position between the initial position and the end position, when the cam 10 is at the intermediate position, the mandrel 12 partially exits the pipe 1 , so that the straight end section 2 of the tail end is fixed by the core rod 12, so as to avoid the problem of sharp edge caused by the air cutting of the saw blade 15.

Preferably, a material retaining flap 17 is also included, the material retaining flap 17 is arranged on the top surface of the clamping mechanism close to the end of the gap 6, and the material retaining flap 17 includes a transversely arranged bottom plate 17a and an upwardly extending flange 17b (see Figs. 2 and 3 ) disposed on the end of the bottom plate 17a away from the gap 6 . Preferably, an elastic component is provided between the material blocking flap 17 and the mold clamping mechanism, and the elastic component is preferably a spring 18 . The material retaining flap 17 ensures that the tail material copper pipe can break away from the core rod 12 when the core rod 12 is fully withdrawn, thereby ensuring the stability of the equipment.

In addition, it is necessary to adjust the control system of the processing equipment for the small elbow of the heat exchanger so that the operation steps are: clamping → copper tube feeding → core rod entry → bending → core rod half retreat → sawing → core rod complete Back→unloading→clamping..., so cycle.

Other structures of the processing equipment for the small elbow of the heat exchanger in this embodiment are the same as those of the prior art, and will not be repeated here.

Fig. 4 is a schematic diagram of the three-dimensional structure of the processing equipment for the small elbow of the heat exchanger in another embodiment of the present invention. The difference from the previous embodiment is that the processing equipment for the small elbow of the heat exchanger in this embodiment is set There are clamping means for fixing said tail end straight section 2 before sawing. Preferably, the clamping device is arranged on the side of the connecting plate 7 close to the bending die 13, which includes a pressing block 19 and a second driving device for driving the pressing block, the pressing A U-shaped groove matching the pipe 1 is provided on the clamping surface of the block 19 . After the bending is completed and the core rod 12 is returned, the second driving device drives the pressing block 19 to press down on the tail end straight section 2, so that no batch front is produced after sawing and the product quality is guaranteed. The second driving device is preferably an air cylinder 20, and a fixed plate 21 is provided on the side of the connecting plate 7 close to the bending die 13, and the air cylinder 20 is fixed on the fixed plate 21 in any feasible manner. Since the cylinder 20 is fixed at this position, it is necessary to modify the cylinder 11 at the core rod 12 so that enough space is reserved at the rear of the cylinder 11 to install the cylinder 20 at the rear of the cylinder 11.

In addition, it is necessary to adjust the control system of the processing equipment for the small elbow of the heat exchanger so that the operation steps are: clamping → feeding → core rod entry → bending → core rod retraction → cylinder entry → sawing → cylinder retraction → Unloading→clamping......, so cycle.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (6)

1. a process equipment for heat exchanger eyesight elbow, including:

Curved mould；

Clamp die mechanism, described clamp die mechanism is fixed on the side of described curved mould, and described clamp die mechanism is curved with described The gap entered for saw blade it is provided with between mould；

Bending mechanism, described bending mechanism and described clamp die mechanism are oppositely disposed in the opposite side of described curved mould, Described bending mechanism includes connecting plate, pattern, core bar and the first driving means, and described pattern can be along curved mold shaft line Vertical direction be slidably arranged on described connecting plate, and there is the initial position making the fully-inserted tubing of core bar With the final position making core bar exit tubing completely, described core bar is fixed on described pattern, and described first drives Dynamic device is used for driving described pattern；

It is characterized in that, increase the haul distance between described initial position and described final position and described The haul distance of the first driving means, makes tubing bending rearward end straight section length more than or equal to 20mm；

Also include that backgauge flap, described backgauge flap are arranged at described clamp die mechanism near one end, described gap On end face, and described backgauge flap includes the base plate of horizontally set and is arranged at described base plate away from described gap The upwardly extending flange of one end.

The process equipment of heat exchanger eyesight elbow the most according to claim 1, it is characterised in that described tail End straight section a length of 22～50mm.

The process equipment of heat exchanger eyesight elbow the most according to claim 1 and 2, it is characterised in that institute State pattern and also there is the centre position between described initial position and described final position, when described pattern When being positioned at described centre position, described core bar part exits described tubing.

The process equipment of heat exchanger eyesight elbow the most according to claim 3, it is characterised in that described gear It is provided with elastomeric element between material flap and described clamp die mechanism.

The process equipment of heat exchanger eyesight elbow the most according to claim 1 and 2, it is characterised in that also Including clamping device, described clamping device includes that compact heap and the second driving means, described compact heap activity set Put, and there is clamped position and non-clamping position, when described compact heap is in described clamped position, described Compact heap coordinates with the clamping seat of honour of described clamp die mechanism to be fixed described tail end straight section, and described second drives dress Put for driving described compact heap.

The process equipment of heat exchanger eyesight elbow the most according to claim 5, it is characterised in that described folder Tight device is arranged on the described bending mechanism side near described curved mould.