CN203784008U - Withdrawal type multifold-force and multi-stroke air cylinder - Google Patents

Abstract

The utility model belongs to the technical field of mechanical equipment, and particularly relates to a withdrawal type multifold-force and multi-stroke air cylinder, which comprises a cylinder wall, pistons, fixed plugs, a piston rod and an air inlet hole, wherein the air cylinder is separated into a plurality of cavities through the fixed plugs, and the pistons are arranged in the cavities and are fixedly connected onto the piston rod. The withdrawal type multifold-force and multi-stroke air cylinder is characterized in that vent holes are formed inside the piston rod, the cavity parts at the left side of the pistons are communicated through the vent holes, a piston group is also arranged on the piston rod and is arranged in the connected cavities at the front end, the piston group and the piston rod can do relative movement in the leftward and rightward direction, the piston group comprises two pistons and a guide rod for connecting the pistons, the two pistons are arranged at the connected cavities, the guide rod passes through the fixed plugs arranged between the connected cavities and can move, and air guide holes are formed inside the guide rod and are used for communicating the left side cavity parts of the connected cavities. The withdrawal type multifold-force and multi-stroke air cylinder has the advantages that the structure is simplified, and the manufacturing cost is reduced; the pistons and the guide rod form the piston group, the structure is simple, and the production and manufacturing cost is low.

Description

Draw back many times of power multiple-pass cylinders of formula

Technical field

The utility model belongs to mechanical equipment technical field, relates to a kind of pneumatic element, and specifically one is drawn back many times of power multiple-pass cylinders of formula.

Background technique

Existing cylinder is generally divided into single times of power one-stroke, single times of power multiple-pass, many times of power one-strokes and many times of power multiple-passes.Single times of strength cylinder is applicable to the machine of the long stroke demand of underloading, if the required cylinder output of machine strength is larger, and can be by increasing cylinder diameter or selecting many times of strength cylinders.Many times of strength cylinders have increased cylinder diameter equivalently in the principle that adopts Multicarity series connection, in isobaric situation, have increased gas pressure area, have also just increased thrust.But this has also just sacrificed originally longer cylinder effective travel.But in needs heavy duties and external diameter of cylinder size is had on the machine of being strict with, many times of strength cylinders occupy absolute advantage.One-stroke and multiple-pass depend on internal structure, and some piston is limited restriction stop motion in the time moving to a certain position, forms interim cylinder wall, forms new cavity, and then promote next piston movement.Multiple-pass is mainly used in idle stroke and working stroke to separate, and perfect condition space-time stroke motion speed is fast, switches to many times of power states when working stroke, strengthens thrust output or pulling force.

Cylinder shown in Fig. 1 is three times of power double stroke cylinders of tradition, always has four cylinder bodies, cylinder body 111, cylinder body 115, cylinder body 118 and cylinder body 1110; Having four pistons, is piston 112, piston 116, piston 117 and piston 1111, and wherein piston 112, piston 117 and piston 1111 are fixedly connected with piston rod, and piston 116 is enclosed within on piston rod, with piston rod can left and right directions relatively move; 114,1113 is vent in the first stroke, and 1114,1115,1116 is the vent in the second stroke, and 113,119,1113 is the vent in retraction stroke.

The first stroke is that idle stroke starts, vent 114, vent 1113 connects identical source of the gas, air inlet simultaneously, 1113 cylinder body 1110 internal diameters that connect are less than the cylinder body 115 that vent 114 connects, so at the same time in the situation of air inlet, the pressure that cylinder body 115 internal air pressures produce for the left surface of free-piston 116 is greater than the pressure that cylinder body 1110 internal air pressures produce the right surface of piston 1111, can either ensure so all fixed plugs (112, 117, 1111) do ahead running left together with piston rod, can ensure again in the time that the high order end of hat fixed plug 117 is encountered the free-piston 116 that is pressed in cylinder body 115 right walls, all pistons and piston rod can stop motions.So also just ensure the precision maneuver of the first stroke.

The second stroke starts, vent 114 and vent 1113 stop air inlet, vent 1116, vent 1115 and vent 1114 start air inlet, air pressure acts on respectively the left surface of piston 112, piston 117 and piston 1111, the thrust producing is approximately three times of thrust that single piston is subject to, so formed three times of force-stroke.

Retraction stroke is by vent 1113, vent 119, vent 113 air inlets, and the vent of propelling stroke changes exhaust into before, goes into retraction stroke.

In conjunction with above-mentioned introduction, many times of power multiple-pass cylinder blocks of tradition are more, and structure is comparatively complicated, and range can be subject to the length restriction of single cylinder; In order to realize double-stroke function, piston 117 is manufactured into special hat-shaped, for matching and play limit effect with piston 116, has higher difficulty of processing compared with plain cylindrical form piston.

Model utility content

For the technical problem existing in prior art, the purpose of this utility model provides one to draw back many times of power multiple-pass cylinders of formula, has reduced the pipeline quantity on cylinder on shell, has reduced cylinder and the shared space of periphery accessory thereof, simplify the structure, reduced manufacture cost.

The utility model is to realize by following technological scheme:

Build one and draw back many times of power multiple-pass cylinders, comprise casing wall, piston, fixed plug, piston rod and inlet hole, cylinder is divided into several cavitys by fixed plug, in cavity, be provided with piston, piston is fixedly connected on piston rod, it is characterized in that: the inside of described piston rod is provided with vent, vent is connected the cavity part in the left side of piston, on described piston rod, be also provided with piston group, piston group is placed in the connected cavity of front end, and piston group can relatively move with piston rod left and right directions.

Described fixed plug is stuck between two cavitys, outside not exposed.

Further, described piston group comprises two pistons and the guide rod that is connected piston, wherein two pistons are arranged at connected cavity, the fixed plug of guide rod through connected cavity also can move, the inside of guide rod is provided with gas port, and gas port is in order to be communicated with the left side cavity part of the cavity that is connected.

Further, for one is drawn back three times of power double stroke cylinders of formula, wherein, described fixed plug is three, cylinder is separated into four cavitys, i.e. the first cavity, the second cavity, the 3rd cavity and the 4th cavity, two pistons of described piston group are separately positioned on the first cavity and the second inside cavity.Described the second cavity, the 3rd cavity and the 4th inside cavity are respectively arranged with a piston being fixedly connected on piston rod.

The left wall of described the first cavity is provided with the first inlet hole, the left wall of described the 3rd cavity is provided with the second inlet hole, the right wall of described the 4th cavity is provided with the 3rd inlet hole, and the vent of described piston rod is communicated with left side cavity part, the left side cavity part of the 3rd cavity inner carrier and the left side cavity part of the 4th cavity inner carrier of the second cavity inner carrier.

The technical solution of the utility model, its beneficial effect is: thereby fixed plug is hidden in cylinder interior, to reach structure compacter, and profile is more attractive in appearance; On shell, hole count minimizing means that the pipeline quantity of receiving on cylinder reduces, and is also just equivalent to reduce cylinder and the shared space of periphery accessory thereof, simplifies the structure, and has reduced manufacture cost; Form piston group by two pistons and two guide rods, this relatively simple for structure, manufacturing cost is low.

Brief description of the drawings

Fig. 1 is three times of power double stroke cylinder structural representations of present technology.

Fig. 2 is three times of power double stroke cylinder structural representations of embodiment of the present utility model.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment, the technical solution of the utility model is described in detail.

Shown in Fig. 2, the present embodiment is a kind of three times of power double stroke cylinders drawing back formula, comprise casing wall, piston, fixed plug, piston rod and inlet hole, cylinder body is separated into four cavitys by three fixed plugs 206,207,208, i.e. the first cavity 215, the second cavity 216, the 3rd cavity 218 and the 4th cavity 217; In cavity, be provided with five pistons, be first piston 201, the second piston 202, the 3rd piston 203, the 4th piston 204 and the 5th piston 205, first piston 201 and the second piston 202 are for controlling the use of double-stroke, connect to form a piston group by two guide rods, the first piston 201 of piston group is arranged on the first inside cavity, and the second piston 202 is arranged on the second inside cavity; The 3rd piston 203, the 4th piston 204, the 5th piston 205 are for realizing the use of three times of power, three pistons are fixedly connected on same piston rod, associated movement, three pistons are placed in respectively in the second cavity, the 3rd cavity and the 4th cavity, wherein the second piston of the 3rd piston and piston group is in same cavity, and in the first stroke, this two-piston is close to the other side, encounters fixed plug 206 stop motions until control the first piston 201 of stroke, two-piston departs from, and enters immediately the second stroke.

The left wall of the first cavity is provided with the first inlet hole 209, the left wall of the 3rd cavity is provided with the second inlet hole 210, the right wall of the 4th cavity is provided with the 3rd inlet hole 211, and the vent 214 of piston rod 212 is communicated with leftward space, the leftward space of the 3rd cavity inner carrier and the leftward space of the 4th cavity inner carrier of the second cavity inner carrier.

In the first stroke, need to pass into air pressure in motion postive direction with in the other direction for guarantee the 3rd piston 202 and piston group can abut against each other associated movement simultaneously, but still will ensure that piston can normally advance to postive direction.

In the second stroke, enter three times of force-stroke in order to make three pistons can promote piston rod, the highpressure entering in cylinder body need to enter three cavitys simultaneously.The method that many times of strength cylinders in the past use is that air pressure is passed into three apertures on cylinder cylinder arm, thereby enters three cavitys; The air inlet design simplification that the present embodiment relates to ventilation pipeline structure, avoid at the external breathing pipe of three cylinder bodies, avoid burrowing and sealing again on cylinder body, then employing is to use hollow piston rod, in bar, air flue is made in punching, the highpressure of the first cavity is entered to the second cavity and the 3rd cavity along piston rod transmission, reached the effect that makes the highpressure passing into simultaneously act on three piston faces.

The 3rd piston 203, the 4th piston 204, the 5th piston 205 are fixed together with piston rod 212, and first piston 201 and the second piston 202 are independently a piston group.When cylinder original state, first piston 201 is close to the low order end inwall of the first cavity 215, the 3rd piston 203, piston the 4th piston 204, the 5th piston 205 and piston rod 212 push up left, the right surface of the second piston 2 and the left surface of the 3rd piston 203 fit, and now the 4th piston 204, the 5th piston 205 are affixed on the right side inwall of fixed plug 210, fixed plug 208 respectively.

The first stroke starts, and the first inlet hole 209, the 3rd inlet hole 211 air inlets simultaneously, promote five pistons together to left movement.Allow the first inlet hole 209 and the 3rd inlet hole 211 air inlets can make the second piston 202 and the 3rd piston 203 all fit tightly in the whole process of the first stroke simultaneously, while stopping on the right Surface Contact fixed plug of piston 201 left side like this, the second piston 202 and the 3rd piston 203, still in fitting tightly state, have also just ensured the controlled of the first stroke end position.If obstructed the 3rd inlet hole may cause leaving between the second piston 202, the 3rd piston 203 gap of unknown size.The gas pressure intensity that in the first stroke, the first inlet hole 209 and the 3rd inlet hole 211 enter equates, first piston 201, the second piston 202 and guide rod entirety are subject to the thrust to the right of twice, the 5th piston 205 is received single thrust left doubly, therefore the resultant pressure direction producing to the right, promotes five pistons and move right.

The second stroke starts, the first inlet hole 209 and the 3rd inlet hole 211 keep aeration status, the second inlet hole 210 starts air inlet, the gas that enters cylinder can enter the 3rd cavity 218 along the vent of piston rod 214, and enter the second cavity 216, the 4th cavity 217 along vent 214, the air pressure now passing into can act on the left surface of the 3rd piston 203, the 4th piston 204 and the 5th piston 205 simultaneously, surface area is approximately three times of independent piston, therefore the thrust to the right producing is approximately three times of single piston, therefore the second stroke is three times of force-stroke.

In return stroke, each piston is back to initial position.The first inlet hole 209 and the 3rd inlet hole 211 are ventilated, and the gas in each cylinder inner carrier leftward space is discharged outside cylinder along vent 214, the second inlet hole 210.

Above embodiment is preferred embodiment of the present utility model; the utility model is not limited to above-described embodiment; for those of ordinary skills; the any apparent change of doing on the basis that does not deviate from the utility model know-why, all belongs to the protection domain of design of the present utility model and claims.

Claims (6)

1. draw back many times of power multiple-pass cylinders of formula for one kind, comprise casing wall, piston, fixed plug, piston rod and inlet hole, cylinder is divided into several cavitys by fixed plug, in cavity, be provided with piston, piston is fixedly connected on piston rod, it is characterized in that: the inside of described piston rod is provided with vent, vent is connected the cavity part in the left side of piston, on described piston rod, be also provided with piston group, piston group is placed in the connected cavity of front end, and piston group can relatively move with piston rod left and right directions.

2. many times of power multiple-pass cylinders of formula of drawing back according to claim 1, it is characterized in that: described piston group comprises two pistons and the guide rod that is connected piston, wherein two pistons are arranged at connected cavity, the fixed plug of guide rod through connected cavity also can move, the inside of guide rod is provided with gas port, and gas port is in order to be communicated with the left side cavity part of the cavity that is connected.

3. many times of power multiple-pass cylinders of formula of drawing back according to claim 2, it is characterized in that: described fixed plug is three, cylinder is separated into four cavitys, i.e. the first cavity, the second cavity, the 3rd cavity and the 4th cavity, two pistons of described piston group are separately positioned on the first cavity and the second inside cavity.

4. the many times of power multiple-pass cylinders of formula of drawing back according to claim 3, is characterized in that: described the second cavity, the 3rd cavity and the 4th inside cavity are respectively arranged with a piston being fixedly connected on piston rod.

5. many times of power multiple-pass cylinders of formula of drawing back according to claim 4, it is characterized in that: the left wall of described the first cavity is provided with the first inlet hole, the left wall of described the 3rd cavity is provided with the second inlet hole, the right wall of described the 4th cavity is provided with the 3rd inlet hole, and the vent of described piston rod is communicated with left side cavity part, the left side cavity part of the 3rd cavity inner carrier and the left side cavity part of the 4th cavity inner carrier of the second cavity inner carrier.

6. the many times of power multiple-pass cylinders of formula of drawing back according to claim 1, is characterized in that: described fixed plug is stuck between two cavitys, outside not exposed.