pinch valve

Abstract

The invention relates to a pinch valve (10) comprising: - a hose guide (400) oriented along a hose guide axis, - a clamping member (300) having • a push rod (310) movably supported along a push rod guide axis oriented perpendicular to the hose guide axis; and • two clamping arms (320) jointly forming a clamping jaw, which are hinged on a front end of the push rod (310) facing the hose guide (400) and are pivotable opposite to each other about pivot axes oriented parallel to the hose guide axis, respectively; and - a seat arranged on a side of the hose guide (400) opposite to the clamping member (300), wherein the clamping arms (320) are coupled with a mechanical forced guide such that a retraction of the push rod (310) from a clamping position of maximum feed of the clamping member (300) causes a pivoting movement of the clamping arms (320) in a closing direction of the clamping jaw. The invention is characterized in that the clamping member (300) is supported between two side walls (110) extending parallel to the hose and push rod guide axes, the side walls each having a step (112) extending parallel to the hose guide axis and receding with respect to the push rod feed direction, wherein the clamping arms (320) run over the mentioned steps (112) with their outer sides facing away from the hose guide when the clamping member (300) is moved.

Description

Technical Field

[0001] This invention relates to a pinch valve, the pinch valve comprising:

[0002] - A hose guide portion oriented along the hose guide axis.

[0003] - Card holder, which has

[0004] A push rod movably supported along a push rod guide axis oriented perpendicular to the hose guide axis; and

[0005] Two clamping arms that together form a clamping jaw are hinged to the front end of the push rod facing the hose guide and can pivot about pivot axes parallel to the hose guide axis, respectively, in opposite directions; and

[0006] - A support, which is arranged on the side of the hose guide opposite to the clamp.

[0007] The clamping arm is coupled to the mechanical force guide, so that the retraction of the push rod from the clamping position of the maximum feed of the clamping member causes the clamping arm to pivot in the closing direction of the clamp. Background Technology

[0008] This type of pinch valve is known from DE 10 2011 055 850 B3.

[0009] Pinch valves are known in several variations. For example, a basic type of pinch valve is disclosed in DE 199 17 622 C2. This pinch valve has a hose guide into which a flexible hose for transporting the medium can be placed. The hose guide is used to more or less precisely position the hose between the clamp and the support. The axial direction of the hose guide, i.e., the axial direction of the hose in the installed state, is hereby referred to as the geometric axis of the hose guide axis. An important element of the pinch valve is the clamp, which can move perpendicularly to the hose guide axis onto the support. The axial direction or direction of movement of the clamp (especially its push rod) is hereby referred to as the geometric axis of the push rod guide axis. The feeding of the clamp, i.e., its movement toward the support, causes the free inner cavity of the hose guide to narrow, thus resulting in compression of the elastic flexible hose placed in the hose guide. As a result, the free inner cavity of the hose narrows until it is completely closed, thereby reducing or completely blocking the flow of the medium in the hose. The force required for feeding the clamp can be generated manually or automatically, for example, by electric or electromagnetic, pneumatic or hydraulic means.

[0010] The aforementioned literature discloses a special type of clamp valve that addresses the problem that, during clamp retraction (i.e., when the clamp moves away from the support), the hose's inner cavity may not open or fully open. This is because the mutually compressed inner surface areas of the hose adhere to each other, and the inherent elasticity of the hose material is insufficient to allow the hose to fully return to its initial shape. To solve this problem, the literature proposes that the clamp arms be hook-shaped and pivotally hinged to the clamp push rod in opposite directions, so that the clamp arms together form an openable and closable jaw. When the valve is closed, during clamp feed, the jaw opens, thereby compressing the hose's inner cavity by means of the jaw's opening bottom. When the valve is opened, during clamp retraction, the jaw should partially close, wherein the hook end applies a radially inward force to the folded edge of the compressed hose. This force, rigidly converted by the material of the hose, becomes a force that separates the inner surface areas that abut each other, supporting the inherent elasticity of the hose as it returns to its initial shape. To achieve a mouth movement or arm pivoting synchronized with the movement of the clamping element, the aforementioned literature further proposes that each clamping arm be coupled to a suitably shaped slide by means of a spacer on its free end that carries the slider. Thus, the opening of the jaws during clamping element feeding and their closing during clamping element retraction are forced through the lateral interaction of the slider and the associated slide. This is disadvantageous because the closed slide requires a large amount of structural space that is nonexistent within the compact interior of the valve. Furthermore, the bidirectionally acting slide must be constructed with very fine and low tolerances to avoid jamming, making manufacturing more expensive and prone to jamming and damage upon wear. Summary of the Invention

[0011] The objective of this invention is to improve a type of clamp valve so that the mechanically forced guide of the clamp arm can be manufactured more robustly, more space-savingly, and at a lower cost.

[0012] This task is solved by the clamp valve according to the invention in such a way that the clamping member is supported between two side walls of the valve housing that extend parallel to the hose guide axis and the push rod guide axis, the side walls having stepped portions that extend parallel to the hose guide axis and retract with respect to the push rod feed direction, wherein the clamping arm travels through the aforementioned stepped portions with its outer side away from the hose guide portion against the side wall as the clamping member moves.

[0013] This invention is based on the understanding that, in order to force the clamping movement described above, a bidirectional force-guiding element is not required, but rather a unidirectional force-guiding element that acts only when the clamp retracts. During the feeding of the clamp, i.e., when closing the clamp valve, the reaction force of the hose acting in opposition to the clamp feeding (which is applied to the bottom of the clamp and the end region where the clamp arm is hinged) has already caused the clamp arm to pivot outwards or stabilize in an outwardly pivoted position, corresponding to the open position of the clamp. A clamp valve with a pivotable clamp arm, without any force-guiding element, also functions correctly at least during its clamp feeding, i.e., when closed. If the clamp and hose rigidly require closure by inward pivoting of the clamp arm, then a force-guiding element is only needed when the valve is open, i.e., when the clamp retracts. According to the invention, this unidirectional force-guiding element is achieved through the interaction between the outer side of the clamp arm and the stepped sidewall. Due to the retractable stepped sections in the sidewalls, the channel for the clamp's movement is narrower in the rear region than in the front region. When the clamp is in its retracted position, the clamping arm is in the rear region; while when the clamp is in its feed position, the clamping arm is in the front region. The two channel regions are designed so that the outer sides of the clamping arms at least point-by-point abut against the sidewalls in different pivot positions. In the retracted position, the narrow channel width there, i.e., the small distance between the sidewalls there, does not allow for full extension of the clamping arms, i.e., the jaws are not fully open. In the feed position, the larger channel width there, i.e., the larger distance between the sidewalls there, allows for significantly further extension of the clamping arms, i.e., significantly further opening of the jaws. During clamp feeding, the reaction force exerted by the compressed hose always contributes to the maximum opening of the jaws within the corresponding spatial conditions. Near the retracted position, this opening is still incomplete. However, once the contact point on the outer side of the clamp arm has passed the stepped portion according to the invention, the sidewalls no longer resist further opening of the clamp, and the clamp arm pivots further outward under the reaction force exerted by the hose, thereby squeezing the hose from the bottom of the opening of the clamp, which is largely or preferably fully open. During clamp retraction, once the contact point on the outer side of the clamp arm has passed the stepped portion according to the invention, the clamp is forced to close because, as explained above, the space between the sidewalls is simply insufficient for full opening. The closing movement of the clamp has an effect known in principle from the prior art and already described at the beginning: the free end of the hook-shaped clamp arm applies pressure to the folded edge of the squeezed hose, which subsequently causes the previously closed hose cavity to reopen.

[0014] Introducing the stepped portion according to the invention into the sidewall of a compact pinch valve is easy in manufacturing. The stepped structure in a solid wall is also very robust and largely wear-resistant. This structure is also not delicate, so large tolerances caused by manufacturing, wear of the clamp arm hinge, and rotational misalignment of the clamping element will not limit the valve's function.

[0015] Preferably, the stepped portion is constructed with a small-angle inclination, so that the closing or opening movement of the clamp extends in a larger retraction or feed path of the clamping member, which improves functional safety and inhibits wear.

[0016] Furthermore, as mentioned above, there is a possibility of rotational misalignment of the clamping element, which is tolerable to some extent due to the present invention. However, this rotational misalignment cannot be allowed to go uncontrolled. Therefore, in the improved embodiment of the present invention, each sidewall has a first clamping element guide groove extending parallel to the push rod guide axis, and the outer side of each corresponding clamping arm rests against the bottom of the first clamping element guide groove. Thus, when the clamping element moves, the contact portion on the outer side of the clamping arm moves along the bottom of the first clamping element guide groove. Therefore, the sidewall of the first clamping element guide groove forms a guide channel pointing in the direction of movement of the clamping element, which inhibits the rotation of the clamping element about its push rod guide axis. Those skilled in the art can use the relative dimensions of the groove width and the clamping arm thickness to design in order to set appropriate tolerances for the rotation of the clamping element. Those skilled in the art will understand that the stepped portion according to the present invention must of course (at least) exist at the bottom of such a first clamping element guide groove, because in the improved embodiment of the present invention, the interaction between the sidewall (especially the stepped portion) and the outer side of the clamping arm, which is important to the present invention, occurs precisely here.

[0017] Advantageously, each clamping arm has a contact roller on its outer side, the contact roller being rotatable about a rotation axis parallel to the hose guide axis, and the corresponding clamping arm abuts against its mating sidewall with the contact roller. In other words, the area on the outer side of the clamping arm, previously referred only to the contact area, is constructed in the form of a rotatable roller. This reduces friction between the outer side of the clamping arm and the sidewall, resulting in better system flexibility and reduced wear due to operation. In a preferred embodiment, the hook-shaped design of the clamping arm leads to a bent guide line on the outer side of the clamping arm, and the contact roller is preferably positioned in this bent area.

[0018] Preferably, the contact roller is formed in an annular shape; this is especially true in embodiments where the contact roller operates in the guide groove of the first clamping member. On the one hand, the annular roller shape can compensate for rotational misalignment of the clamping member. On the other hand, the interaction with the sidewall of the guide groove of the first clamping member results in only minor friction.

[0019] The push rod of the clamp is preferably constructed in a multi-piece manner, comprising a push rod shaft and a push rod tip, with a clamping arm hinged to the push rod tip. The push rod tip is advantageously releasably connected to the push rod shaft, and particularly preferably connected to the push rod shaft via a ball locking mechanism. Unlike the push rod shaft, the push rod tip, reinforced by the clamping arm, is subject to considerable wear. Accordingly, their individual replaceability is desirable, which is achieved through the aforementioned detachable multi-piece structure. Furthermore, the interchangeability of the push rod tips (including the clamping arms) can also be used to match the clamp valve to different hose sizes. The dimensional design of the clamping arms, especially the resulting clamp width, should be coordinated with the hose size. Thus, different hose sizes are used according to clamps of different sized designs, at least in the clamp area. With the aforementioned improvement of the invention, this matching can be performed by simply replacing the push rod tip without having to separate the push rod shaft from its motor drive. Because such changes to the putter tip can occur quite frequently during normal operation, it is advantageous to achieve an easily operable coupling between the putter shaft and the putter tip. However, this must still maintain absolute operational safety. Here, the preferred ball locking mechanism has proven to be reliable.

[0020] In addition to the clamp width, the width of the hose guide should also be coordinated with the corresponding hose size. To ensure easy matching, in a particularly preferred embodiment of the invention, the hose guide is provided to consist of two axially spaced, replaceable housing inserts, particularly made of plastic, which together form an interrupted circular groove extending along the hose guide axis, wherein a clamping element is arranged in the free space between the two housing inserts. The groove width or radius of curvature of the circular groove is optimized for a given hose size. Therefore, when changing the hose size, it is recommended that when replacing the hose guide, the two housing inserts be replaced with two housing inserts with a dimensional design optimized for the new hose size. Furthermore, such housing inserts are subject to considerable wear. Therefore, it is advantageous to manufacture the housing inserts from inexpensive plastic, while the housing, which imparts stability to the overall system, is preferably made of metal. The arrangement of the housing inserts on both sides of the clamping element ensures stable fixation of the hose on both sides of the compression area, which prevents slippage and optimizes the reproducibility of valve function.

[0021] Preferably, the housing insert has a second clamping member guide groove extending parallel to the push rod guide axis in each of its facing end sides, and the corresponding guide protrusions of the clamping members are respectively embedded in the second clamping member guide groove. Similar to the first clamping member guide groove described above, the second clamping member guide groove inhibits rotation of the clamping member about its push rod guide axis. The second clamping member guide groove can be designed very deep, thus forming a very precise guide for the clamping member without causing an increase in the external dimensions of the pinch valve, as is the case, for example, in a correspondingly deep design of the first clamping member guide groove.

[0022] The pivot axes of the clamping arms are preferably the same, meaning that the two clamping arms are preferably pivotable about the same pivot axis. However, it may also be meaningful, especially in the case of clamping valves with large-volume hoses, that the pivot axes of the two clamping arms are arranged to be parallel and offset from each other. This can reduce the depth of the clamp.

[0023] The support is advantageously an integral part of the openable housing cover. With the cover open, all replaceable components can be easily installed, and hoses can be inserted into the hose guide. Here, access to the valve interior is achieved in the area not occupied by the motor drive of the push rod. More precisely, the push rod is located on the side of the housing opposite the cover. After the cover is closed (whereby the support is simultaneously introduced into its precisely aligned working position with the clamping element), operation of the valve according to the invention can begin immediately. Attached Figure Description

[0024] Further details and advantages of the present invention will become apparent from the following detailed description and accompanying drawings. Wherein:

[0025] Figure 1 An exploded view of the pinch valve according to the present invention is shown.

[0026] Figure 2 The image shows the assembled state with the lid closed. Figure 1 A perspective view of a pinch valve.

[0027] Figure 3 The diagram shows the valve in the open state. Figure 2 A cross-sectional view of a pinch valve.

[0028] Figure 4 The diagram shows the valve in the closed state. Figure 2 A cross-sectional view of a pinch valve.

[0029] Figure 5 The image shows the assembled state with the lid open. Figure 1 A perspective view of a pinch valve.

[0030] Figure 6 It shows Figure 1 A cross-sectional view of the body of the pinch valve, and

[0031] Figure 7 Shown without a bolt Figure 1 A cross-sectional view of the body of the pinch valve.

[0032] The same reference numerals in the accompanying drawings denote the same or similar elements. Detailed Implementation

[0033] Figure 1An exploded view of a pinch valve 10 according to the present invention is shown. The pinch valve 10 includes a housing body 100 having a longitudinally extending sidewall 110 and an end wall 111 having a U-shaped recess.

[0034] The sidewalls 110 of the housing body 100 each have cover guide grooves 120 on their upper edges. In the illustrated embodiment, the cover guide grooves are constructed as two sections 122 spaced apart from each other by a gap 124.

[0035] In the central positioning, the inner side of the sidewall 110 of the housing body 100 has a vertically extending first clamping guide groove 114, which shows a longitudinally extending stepped portion 112. Next, in Figure 3 and Figure 4 The function of the stepped section 112 is discussed in further detail in the description. Figure 3 and Figure 4 Cross-sectional views of the clamp valve 10 passing through the plane of the first clamp guide groove are shown.

[0036] The housing insert 410 can be installed into the hollow space of the housing body 100. The housing insert has a section with a rounded bottom groove 412, and together with a recess in the end wall 111 of the housing body 100, forms a hose guide 400 (not shown), for a longitudinally extending, flexible hose for guiding media. This hose guide 400 is particularly suitable for… Figure 5 As can be clearly seen in the illustration, on their opposing end sides, the housing insert 410 has vertically extending clamping guide grooves 414, the function of which will be discussed further below.

[0037] One of the sidewalls 110 of the housing body 100 has a first eyelet 140 and a second eyelet 150 on its outer side, which are constructed and aligned spaced apart from each other in the longitudinal direction, allowing the bolt 500 to be moved into them to obtain axial and rotational sliding support. In the illustrated embodiment, the first eyelet 140 is constructed as a through hole, and the second eyelet 150 is constructed as a blind hole. In the illustrated embodiment, the bolt 500 has a spring-preloaded stop element 510 at its distal end and an operating lever 520 at its proximal end. Furthermore, in the illustrated embodiment, the bolt 500 has a radial protrusion 530 between its two ends near the operating lever 520. These elements and their functions will be explained below. Figure 6 and Figure 7 This is discussed in further detail in the description.

[0038] Furthermore, the pinch valve 10 includes a cap 200, the longitudinal sides of which are reinforced by guide edges 210. In the illustrated embodiment, the guide edges 210 are each divided into two segments 212, which are spaced apart from each other by a gap 214. These conditions are particularly evident in… Figure 5As can be clearly seen, during operation, the guide edge 210 interacts with the cover guide groove 120 of the housing body 100. Here, the guide edge 210 can be inserted into the cover guide groove 120, so that the above-mentioned elements together form a movable sliding support for the cover 200 on the housing body 100. By the longitudinal movement of the cover 200, the upwardly open housing body 100 can thus be closed or opened according to the principle of moving the cover. The closed movement position of the cover is defined by four spring-preloaded ball joint pins 130 introduced into the working surface of the housing body 100, which engage in corresponding locking recesses 230 in the lower side of the cover 200. Figure 5 These locking recesses 230 can be identified. The segments 122 and gaps 124 of the cover guide groove 120 of the housing body 100 are coordinated with the corresponding segments 212 and gaps 214 of the guide edge 210 of the cover 200, such that at least one movable position of the cover exists, in which two opposing segments 212 of the guide edge 210 of the cover 200 are located in the opposing gaps 124 of the cover guide groove 120 of the housing body 100, so that the cover 200 can be lifted vertically from the housing body 100 or can be pivoted relative to the housing body about a pivot axis parallel to its sidewalls.

[0039] To provide such a pivot axis, the cover 200 has a tongue 222 that bulges laterally from one of its guide edges 210. At its laterally outer end, the tongue 220 has a sleeve 222, as particularly in… Figure 2 and Figure 5 As can be seen, the sleeve, in the assembled state of the housing, is aligned with the holes 140, 150 and the inserted bolt 500, such that the bolt 500, together with the sleeve 222, forms a pivot bearing for the axial and rotational movement of the sleeve 222 and therefore the cover 200. It should be noted that the length of the sleeve 222 is designed to be shorter than the distance between the two holes 140, 150, thereby enabling axial movement of the cover 200 relative to the housing body 100, especially when the guide edge 210 of the cover engages with the cover guide groove 120 of the housing body 100.

[0040] Figure 1 Also shown is a clamping member 300, which includes a push rod 310 and two clamping arms 320. In the illustrated embodiment, the push rod 310 is constructed in two parts, having a push rod shaft 312 and a push rod tip 314, the push rod tip having a hinge portion 322 for the clamping arms 320. The clamping arms 320 are hook-shaped and each has a bent hook end 324 at its tip. At the bend of the hook end 324, the clamping arms 320 have contact rollers 326 on their outer sides for interacting with the first clamping member guide groove 114 of the housing body 100, which will be discussed in further detail below.

[0041] The push rod shaft 312 and the push rod tip 314 can be releasably connected to each other via a ball locking mechanism 316, which is particularly useful in... Figure 3 and Figure 4 This can be seen better in the cross-sectional view.

[0042] Figure 2 A clamp valve 10 with a closed cap in an assembled state is shown. Figure 3 and Figure 4 The valves are shown in the open position ( ) Figure 3 ) and valve closed position ( Figure 4 In ) Figure 2 A cross-sectional view of the pinch valve 10. Figure 3 and Figure 4 The cutting planes AA are marked in the auxiliary view shown on the left side of the cross-sectional view. It can be seen that the cutting is transverse to the longitudinal direction of the clamp valve 10, that is, transverse to the hose guiding direction and extends centrally, so that the cutting plane extends exactly in the middle of the first clamp guide groove 114. Due to the stepped portion 112, the channel formed between the sidewalls is narrower in the lower region than in the upper region. In the valve open position, i.e., the clamp 300... Figure 3 In the retracted position shown, the clamping arm 320 is located in the narrower channel area below. The clamping arm rests against the bottom of the first clamping member guide groove 312 via contact rollers 326. Figure 3 As can be seen, the relative dimensions were chosen such that the clamp formed by the clamping arm 320 is not fully open. However, the free space above the clamp up to the underside of the cover 200 is still large enough to position the flexible guiding medium hose in the hose guide 400, in particular by placing the hose into the rounded groove 412 of the housing insert 410.

[0043] To close the valve, the clamp 300 is moved onto the cover, causing the bottom of the clamp opening to press the hose against the cover 200, which acts as a support, thus narrowing or completely closing the hose's interior. During the feed of the push rod 310, the contact roller 326 rolls over the stepped portion 112 and thus reaches the wider channel area above, where the clamp can be fully opened. This opening of the clamp is forced by the elasticity of the hose against the push rod feed.

[0044] When the valve reopens, the push rod retracts. The contact roller 326 again overcomes the step 112, causing the clamping arms 320 to pivot toward each other by a smaller distance from the sidewalls 110 in the lower edge region, thus partially closing the clamp again. Here, the hook end 324 presses from the lateral outside onto the folded area of ​​the hose that is not yet fully opened, and thus supports the reopening of its interior even if the inherent elasticity of the hose (e.g., due to the adhesion of the hose inner walls to each other) is insufficient. The forced guidance of the clamping arms 320 through the interaction of the step 112 with the contact roller 326 is a mechanically simple and very robust possibility for reliably forcing the immediate and complete reopening of the hose interior when the clamp valve 10 is opened. The arrangement of the step 112 in the first clamping member guide groove 114 is not mandatory for function, but advantageous, because it prevents rotation of the clamping member 300 about its push rod axis. Another measure to prevent this rotation is the second clamping guide groove 114 in the opposing sides of the housing insert 410 of the hose guide 400. These interact with the longitudinal protrusion of the push rod tip 314, which... Figure 1 In the absence of specific reference numerals, it is identifiable.

[0045] To replace the hose and / or housing insert and / or clamp and / or parts thereof, cover 200 must be opened. As already described above, the cover... Figure 2 The closed position shown is defined by the locking engagement of the spring-preloaded ball joint pin 130 of the housing body 100 into the corresponding locking recess 230 of the cover 200. Furthermore, in this closed position, the guide edge 210 of the cover 200 is guided in the corresponding cover guide groove 120 of the housing body 100. This means that a section 212 of the guide edge 210 of the cover 200 is co-located with a corresponding section 122 of the cover guide groove 120 of the housing body 100. In this state, vertical lifting or pivoting of the cover is not possible. Due to the spring-preloaded ball joint locking members 130 / 230, the cover 200 is fixed vertically and horizontally in this position without play. The sleeve 222, coaxially surrounding the bolt 500, does not require support force in this position.

[0046] When using the longitudinal force to overcome the locking mechanism 130 / 230, longitudinal movement of the cover is possible. The sleeve 222, supported on the bolt in the holes 140, 150, always moves longitudinally without force, i.e., along the bolt's axial direction. In the moved position (where the section 212 of the guide edge 210 of the cover 200 is in clearance with the section 122 of the cover guide groove 120 of the housing body 100), lifting or pivoting of the cover is possible, wherein the spring preload of the ball pin 130 pushes the cover upward upon reaching the moved position, thus identifiablely indicating the moved position. In this state, the sleeve 222, together with the bolt 500, can serve as a pivot bearing for the cover 200, thereby allowing the cover to be transferred... Figure 5 The pivoted position is shown. In this position, the interior of the housing body 100 is accessible, especially for the purpose of replacing the hose, housing insert 410 and / or clamp 300 or parts thereof.

[0047] The cover 200 is closed in reverse order, wherein the axial guidance achieved by the sleeve 222 and the bolt 500 enables the guide edge 210 of the cover 200 to be safely and unobstructedly guided into the cover guide groove 120 of the housing body 100.

[0048] As mentioned, the interaction between sleeve 222 and bolt 500 is essentially without axial force. However, this is an idealized assumption. In practice, axial forces can be generated on bolt 500, especially due to continuous vibration. Therefore, the illustrated embodiment provides axial fixation of the bolt, which simultaneously allows for the removal of the bolt for the purpose of completely removing the cover 200. For illustration, refer to... Figure 6 and Figure 7 , Figure 6 and 7 Different cross-sectional views are shown along the cutting plane AA, for example, in the auxiliary view shown to the right of the corresponding cross-sectional view. Figure 7 An enlarged view of segment B of the corresponding cross-sectional view is also shown.

[0049] As in Figure 7As can be seen in the enlarged view of the first eyelet 140, the first eyelet 140 is constructed as a through hole with a first groove 142, which is a through groove extending longitudinally through the eyelet. A second groove 144 is arranged at a 90° angular distance; this second groove is constructed as a longitudinally extending blind groove, with its end facing the second eyelet 150 open. When the bolt 500 is inserted into the first eyelet, the bolt is oriented by means of the operating lever 520, so that its radial protrusion 530 is inserted into the first groove 242. The bolt is fed so far that the radial protrusion 530 completely passes through the first groove 142 and is positioned between the two eyes 140 and 150. Especially in the final stage, this movement is carried out against the spring force of the spring-preloaded stop element 510, which stops at the closed rear wall of the second eyelet 150, which is constructed as a blind hole. Subsequently, the bolt is rotated 90° by the lever 520, so that its radial protrusion 530 is positioned before the input end of the second slot 144. Upon release of the lever 520, the bolt 500 is pressed into the second slot 144, which is configured as a blind slot, by the spring force of the stop element 510, wherein this rearward movement of the bolt 500 terminates at the closed end of the second slot 144 where the radial protrusion 530 stops. The bolt 500 is designed such that its distal end has not yet exited the second eyelet 150, which is configured as a blind hole, in this condition. Therefore, the bolt 500 is axially and rotationally secured.

[0050] To remove the bolt 500, pressure is applied to its proximal end, causing its radial protrusion 530 to disengage from the blind slot 144 against the spring force of the stop element 510. The bolt 500 then twists 90° and repositions its radial protrusion 530 in front of the through slot 142, enabling the entire bolt to be pulled out from the two holes 140, 150. In the illustrated embodiment, the first slot 142 and the second slot 144 are each constructed in a dual-implementation manner, so that the corresponding direction of rotation of the bolt is irrelevant during locking or unlocking.

[0051] Those skilled in the art will understand that the separate fixing and removal of the bolt 500 as described are of little practical importance. More important is the hinge of the cap 200 via the bolt 500. Therefore, the process described above is typically performed using the cap 200 in the closed position, allowing the bolt 500 to coaxially penetrate the clearly defined and positioned sleeve 222.

[0052] Of course, the embodiments discussed in the specific description and shown in the accompanying drawings are merely illustrative examples of the invention. Those skilled in the art will recognize a wide range of possibilities for variation based on this disclosure.

[0053] List of reference numerals

[0054] 10 Pinch valve

[0055] 100 Valve body

[0056] 110 sidewall

[0057] 111 end wall

[0058] 112 Steps

[0059] 114 First clamping guide groove

[0060] 120 Cover guide groove

[0061] 122 Section of the cover guide groove

[0062] 124. Gap between sections of the cover guide groove

[0063] 130 ball head pin

[0064] 140 First Hole

[0065] 142 Through-slot / First slot

[0066] 144 Blind slot / Second slot

[0067] 150 Second hole

[0068] 200 lids

[0069] 210 Guide Edge

[0070] 212 Sections guiding the edge

[0071] 214 Gap between sections of the guiding edge

[0072] 220 tongue plate

[0073] 222 Sleeve

[0074] 230 locking recess

[0075] 300 card holders

[0076] 310 putter

[0077] 312 push rod shaft

[0078] 314 Putter tip

[0079] 316 Ball Locking Mechanism

[0080] 320 clamp arm

[0081] 322 Hinge

[0082] 324 hook tip

[0083] 326 Contact Roller

[0084] 400 Hose Guide Section

[0085] 410 Housing insert

[0086] 412 Round Bottom Groove

[0087] 414 Second clamp guide slot

[0088] 500 bolts

[0089] 510 Stop element

[0090] 520 joystick

[0091] 530 Radial protrusion

Claims

1. A pinch valve (10), the pinch valve comprising: - A hose guide (400) oriented along the hose guide axis. - Card holder (300), the card holder having Push rod (310), said push rod being movably supported along a push rod guide axis oriented perpendicular to the hose guide axis; and Two clamping arms (320) that together form a clamping opening are hinged to the front end of the push rod (310) facing the hose guide (400) and can pivot about pivot axes that are parallel to the hose guide axis, respectively, in opposite directions. as well as - A support, which is arranged on the side of the hose guide (400) opposite to the clamp (300). In order to close the clamp valve (10), the clamp (300) can be fed toward the support, so that the clamp opens when the clamp (300) is fed and the bottom of the clamp presses the hose guided in the hose guide toward the support and narrows the inner cavity of the hose. Furthermore, the clamping arm (320) is coupled to the mechanical force guide, so that the retraction of the push rod (310) from the maximum feed clamping position of the clamping member (300) causes the clamping arm (320) to pivot in the closing direction of the clamp. The characteristic feature is that the clamping member (300) is supported between two side walls (110) of the valve housing that extend parallel to the hose guide axis and the push rod guide axis. The sidewalls each have a stepped portion (112) that extends parallel to the guide axis of the hose and retracts with respect to the feed direction of the push rod. When the clamping member (300) moves, the clamping arm (320) travels along the stepped portion (112) with its outer side away from the hose guide portion against the side wall (110). The mechanical forced guide is achieved unidirectionally through the interaction between the outer side of the clamping arm (320) and the stepped side wall (110).

2. The pinch valve (10) according to claim 1, characterized in that, The stepped section (112) is constructed at a small angle.

3. The pinch valve (10) according to claim 1 or 2, characterized in that, The sidewalls (110) each have a first clamping guide groove (114) extending parallel to the guide axis of the push rod, and the outer side of the clamping arm (320) respectively abuts against the bottom of the first clamping guide groove.

4. The pinch valve (10) according to claim 1 or 2, characterized in that, Each clamping arm (320) has a contact roller (326) on its outer side, the contact roller being rotatable about a rotation axis parallel to the orientation of the hose guide axis, and each clamping arm (320) abuts against the side wall (110) to which it is matched with the contact roller.

5. The pinch valve (10) according to claim 4, characterized in that, The contact roller (326) is formed in an annular shape.

6. The pinch valve (10) according to claim 1 or 2, characterized in that, The push rod (310) is constructed in multiple parts, including a push rod shaft (312) and a push rod tip (314), and the clamping arm (320) is hinged to the push rod tip, wherein the push rod tip (314) is detachably connected to the push rod shaft (312).

7. The pinch valve (10) according to claim 1 or 2, characterized in that, The hose guide (400) consists of two axially spaced, replaceable housing inserts (410) that together form an interrupted round-bottomed groove (412) extending along the hose guide axis, wherein the clamping member (300) is arranged in the free space between the two housing inserts (410).

8. The pinch valve (10) according to claim 7, characterized in that, The housing insert (410) has a second clamping member guide groove (414) extending parallel to the push rod guide axis on its mutually facing end sides, and the corresponding guide protrusion of the clamping member (300) is embedded in the second clamping member guide groove.

9. The pinch valve (10) according to claim 1 or 2, characterized in that, The pivot axes of the clamps (320) are the same as each other.

10. The pinch valve (10) according to claim 1 or 2, characterized in that, The support is part of the openable cover (200).

11. The pinch valve (10) according to claim 6, characterized in that, The tip (314) of the push rod can be loosely connected to the push rod shaft (312) via a ball locking mechanism.

12. The pinch valve (10) according to claim 7, characterized in that, The housing insert is made of plastic.

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