Concrete piston, pumping device and pumping equipment

Abstract

The present invention provides a concrete piston, a pumping device and a pumping equipment. The concrete piston includes a piston body and a first fabric layer; the first fabric layer is circumferentially wrapped around the outer side surface of the piston body; the first fabric layer includes a plurality of fabric layers, and each fabric layer includes a woven fabric. The woven fabric includes first woven threads and second woven threads arranged in a cross pattern. The angle α formed by the first woven threads and / or the second woven threads on at least one fabric layer with respect to the radial plane where the piston body is located is 0° < α < 90°. Based on the optimized design of the arrangement structure of the woven threads in the fabric layer, the present invention can enable the woven threads to conduct stress and effectively disperse the tearing force borne by the fabric layer, ensuring the balance of the force on the fabric layer and the stability of the structure, improving the anti-tearing strength between the layers of the first fabric layer, and ensuring the effective service life of the concrete piston.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete pistons, and in particular to a concrete piston, a pumping device and a pumping equipment. Background Art

[0002] As a sealing and power device, a concrete piston mainly reciprocates in media such as cement slurry to pump the cement slurry to high places and far distances. At the same time, based on the sealing effect, it prevents the cement slurry from leaking out. Therefore, the concrete piston is widely used in the pumping systems of trailer concrete pumps, truck-mounted concrete pumps and concrete pump trucks, and is also one of the main vulnerable parts of the pumping device.

[0003] The existing concrete pistons mainly include a piston body and a cloth layer wrapped around the side surface of the piston body along the circumferential direction. Since the wear of the concrete piston mainly occurs on its side surface, however, the structural design of the existing cloth layer is unreasonable and cannot be optimized according to the operating mechanism of the piston body, resulting in easy wear of the cloth layer during operation, seriously affecting the service life of the concrete piston. Summary of the Invention

[0004] The present invention provides a concrete piston, a pumping device and a pumping equipment to solve the problem that the cloth layer on the existing concrete piston is unreasonably designed and is prone to wear during operation.

[0005] The present invention provides a concrete piston, including: a piston body and a first cloth layer; the first cloth layer is wrapped around the outer side surface of the piston body along the circumferential direction; the first cloth layer includes a plurality of cloth layers, the cloth layer includes a woven cloth, the woven cloth includes a first woven line and a second woven line arranged in a cross pattern, and the angle α formed by the first woven line and / or the second woven line on at least one of the cloth layers with respect to the radial plane where the piston body is located is 0° < α < 90°.

[0006] According to the concrete piston provided by the present invention, the angle α is 30° ≤ α ≤ 60°.

[0007] According to the concrete piston provided by the present invention, the angles α formed by the first woven line and / or the second woven line on at least two of the cloth layers with respect to the radial plane are different.

[0008] According to the concrete piston provided by the present invention, an angle β is formed between the first woven line and the second woven line on the cloth layer, and the angles β formed between the first woven line and the second woven line on each of the cloth layers are the same, or the angles β formed between the first woven line and the second woven line on at least two of the cloth layers are different.

[0009] According to a concrete piston provided by the present invention, the cloth layer is annular and two ends are connected together to form a seam, and the extending direction of the seam is parallel to the first braided wire or the second braided wire.

[0010] According to a concrete piston provided by the present invention, at least one of the first braided wire and the second braided wire includes cotton yarn and polyester yarn wound together.

[0011] According to a concrete piston provided by the present invention, the cotton thread accounts for 60%-95% of the first braided wire or the second braided wire wound with the cotton thread and the polyester thread, and the polyester thread accounts for 5%-40% of the first braided wire or the second braided wire wound with the cotton thread and the polyester thread.

[0012] According to a concrete piston provided by the present invention, the cloth layer further comprises a carboxyl nitrile rubber layer cured into one with the woven cloth to form a carboxyl nitrile rubber composite layer between two adjacent cloth layers; and the piston body comprises a rubber body made of carboxyl nitrile rubber.

[0013] According to a concrete piston provided by the present invention, a plurality of protrusions are constructed on the outer side surface of the piston body, and the first clamping cloth also covers the protrusions.

[0014] According to a concrete piston provided by the present invention, the piston body includes a lip end and a bottom end corresponding to the lip end, the end surface of the bottom end is covered with a second clamping cloth, the first clamping cloth extends from the lip end to the bottom end and is connected to the second clamping cloth; the first clamping cloth extends to the outer side surface of the second clamping cloth, or extends to a side surface of the second clamping cloth away from the piston body; and / or the thickness of the second clamping cloth is greater than the thickness of the first clamping cloth.

[0015] The present invention also provides a pumping device, comprising a delivery cylinder and the above-mentioned concrete piston installed in the delivery cylinder.

[0016] The present invention also provides a pumping device, which comprises the pumping device as described above.

[0017] The concrete piston, pumping device and pumping equipment provided by the present invention can laterally protect the concrete piston by arranging a first fabric wrapped circumferentially on the outer side of the piston body. Based on the optimized design of the arrangement structure of the braided wires in the fabric layer, at least one of the first braided wire and the second braided wire forms an acute angle with respect to the radial plane where the piston body is located. When the concrete piston reciprocates axially, the stress conduction and effective dispersion of the tearing force borne by the fabric layer can be better carried out by each braided wire, preventing the tearing force from acting vertically on the braided wire, ensuring the balance of the force on the fabric layer and the stability of the structure, improving the anti-tearing strength between layers of the first fabric, and ensuring the effective service life of the concrete piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is the first cross-sectional structure schematic diagram of the concrete piston provided by the present invention;

[0020] Figure 2 is the second cross-sectional structure schematic diagram of the concrete piston provided by the present invention;

[0021] Figure 3 is the cross-sectional structure schematic diagram of the first braided wire on the concrete piston provided by the present invention at an angle of 30° with respect to the radial plane where the piston body is located;

[0022] Figure 4 is the cross-sectional structure schematic diagram of the first braided wire on the concrete piston provided by the present invention at an angle of 45° with respect to the radial plane where the piston body is located;

[0023] Figure 5 is the cross-sectional structure schematic diagram of the first braided wire on the concrete piston provided by the present invention at an angle of 90° with respect to the radial plane where the piston body is located;

[0024] Figure 6 is the cross-sectional structure schematic diagram of the composite of adjacent two fabric layers provided by the present invention;

[0025] Reference numerals:

[0026] 1: Piston body; 2: First fabric; 3: Second fabric;

[0027] 20: Fabric layer; 210: Braided fabric; 211: Carboxy nitrile rubber layer;

[0028] 212: carboxylated nitrile rubber composite layer; 11: protrusion. Detailed implementation mode

[0029] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts fall within the protection scope of the present invention.

[0030] The following combines Figures 1 - 6 to describe the concrete piston, pumping device and pumping equipment of the present invention.

[0031] As Figures 1 to 5 shown, this embodiment provides a concrete piston, including: a piston body 1 and a first fabric 2; the first fabric 2 is circumferentially wrapped around the side surface of the piston body 1; the first fabric 2 includes a plurality of fabric layers 20, the fabric layer 20 includes a woven fabric 210, the woven fabric 210 includes a first woven line and a second woven line arranged crosswise, and the included angle α formed by at least one of the first woven line and / or the second woven line on the fabric layer 20 with respect to the radial plane where the piston body 1 is located is 0° < α < 90°.

[0032] Specifically, in this embodiment, by arranging the first fabric 2 wrapped circumferentially on the outer side surface of the piston body 1, the concrete piston can be laterally protected by the first fabric 2. Based on the optimized design of the arrangement structure of the woven lines in the fabric layer 20, at least one of the first woven line and the second woven line forms an acute angle with respect to the radial plane where the piston body 1 is located. Then, when the concrete piston reciprocates axially, the various woven lines can better conduct the stress of the tearing force borne on the fabric layer 20 and effectively disperse it, preventing the tearing force from acting perpendicularly on the woven lines, ensuring the balance of the force on the fabric layer 20 and the stability of the structure, improving the interlayer anti-tearing strength of the first fabric 2, and ensuring the effective service life of the concrete piston.

[0033] It should be noted here that the radial plane shown in this embodiment refers to a plane that is perpendicular to the central axis of the concrete piston and parallel to the end surface of the lip of the piston body 1 indicated by the arrow P in Figure 1 .

[0034] Since there are three states of a straight line relative to a plane, namely inclined intersection, perpendicular intersection, and parallel, and based on the arrangement structure of the woven fabric 210, there must be woven threads arranged along one of the straight line directions on the woven fabric 210 that are inclined or perpendicularly intersect with the radial plane where the piston body 1 is located. Then, in the case where the first cloth clamp 2 is provided with multiple cloth clamp layers 20, in this embodiment, the included angle α formed by the first woven thread and the radial plane where the piston body 1 is located can be set as an acute angle, and the included angle α formed by the second woven thread and the radial plane where the piston body 1 is located can be set as a right angle or an acute angle; at the same time, in this embodiment, the included angle α formed by the second woven thread and the radial plane where the piston body 1 is located can also be set as an acute angle, and the included angle α formed by the first woven thread and the radial plane where the piston body 1 is located can be set as a right angle or an acute angle; in addition, in this embodiment, the included angle α formed by the first woven thread and the second woven thread relative to the radial plane where the piston body 1 is located can also be set as an acute angle for both.

[0035] Further, in this embodiment, the size of the included angle α can be specifically set as 30° ≤ α ≤ 60°. For example, in this embodiment, the included angle α of the first woven thread relative to the radial plane where the piston body 1 is located can be set as 30°, and the included angle α of the second woven thread relative to the radial plane where the piston body 1 is located can be set as 45°; in this embodiment, the included angle α of the first woven thread relative to the radial plane where the piston body 1 is located can also be set as 45°, and the included angle α of the second woven thread relative to the radial plane where the piston body 1 is located can be set as 45°; in this embodiment, the included angle α of the first woven thread relative to the radial plane where the piston body 1 is located can also be set as 60°, and the included angle α of the second woven thread relative to the radial plane where the piston body 1 is located can be set as 30°. Among them, in Figures 3 to 5 the arrangement direction of the first woven thread is the direction indicated by the arrow F, and an included angle β is formed between the first woven thread and the second woven thread on the cloth clamp layer.

[0036] Preferably, in order to enhance the tear resistance of the first cloth clamp 2, in this embodiment, it is set that the included angles α of the first woven thread and / or the second woven thread on at least two cloth clamp layers relative to the radial plane are different.

[0037] In one specific embodiment, the included angles α of the first woven thread and / or the second woven thread on each cloth clamp layer relative to the radial plane can be set to be different. For example, in the case where the first cloth clamp 2 has three layers, the included angle α of the first woven thread on the first cloth clamp layer relative to the radial plane can be set as 30°, and the included angle α of the second woven thread relative to the radial plane can be set as 60°; the included angle α of the first woven thread on the second cloth clamp layer relative to the radial plane can be set as 45°, and the included angle α of the second woven thread relative to the radial plane can be set as 45°; the included angle α of the first woven thread on the third cloth clamp layer relative to the radial plane can be set as 60°, and the included angle α of the second woven thread relative to the radial plane can be set as 30°.

[0038] In another specific embodiment, the angles α of the first braided wires and / or the second braided wires on each fabric layer of the first part with respect to the radial plane can be set to be the same, and the angles α of the first braided wires and / or the second braided wires on the fabric layer of the second part with respect to the radial plane are different or have different magnitudes from the corresponding angles α on each fabric layer of the first part. For example, when the first fabric 2 has three layers, the angles α of the first braided wires on the first fabric layer and the third fabric layer with respect to the radial plane can both be 30°, and the angles α of the second braided wires with respect to the radial plane can both be 60°; the angle α of the first braided wire on the second fabric layer with respect to the radial plane can be 45°, and the angle α of the second braided wire with respect to the radial plane can be 45°. Herein, the second fabric layer is located between the first fabric layer and the third fabric layer.

[0039] It should be noted herein that when the angles α of the first braided wires and / or the second braided wires on at least two fabric layers with respect to the radial plane are different, in this embodiment, it can also be set that one of the first braided wire and the second braided wire on one fabric layer 20 forms a right angle with respect to the radial plane, and the other of the first braided wire and the second braided wire is parallel to the radial plane.

[0040] Furthermore, based on the angular design of the first braided wire and the second braided wire with respect to the radial plane respectively, in this embodiment, the angle β formed between the first braided wire and the second braided wire can also be optimized.

[0041] Among them, in this embodiment, the angle β formed between the first braided wire and the second braided wire on each fabric layer 20 can be designed to be the same. For example: in this embodiment, the corresponding angle β of each fabric layer 20 can be designed to be any value among 45°, 60°, 90° and 150°.

[0042] Meanwhile, in this embodiment, it can also be set that the angles β formed between the first braided wire and the second braided wire on at least two fabric layers 20 are different. For example: when the first fabric 2 includes three fabric layers 20, in this embodiment, the angle β formed between the first braided wire and the second braided wire on the first fabric layer can be designed to be 90°, the angle β formed between the first braided wire and the second braided wire on the second fabric layer can be designed to be 60°, and the angle β formed between the first braided wire and the second braided wire on the third fabric layer can be designed to be 30°. In this embodiment, it can also be designed that the angles β formed between the first braided wire and the second braided wire on the first fabric layer and the third fabric layer are both 90°, and the angle β formed between the first braided wire and the second braided wire on the second fabric layer is 60°.

[0043] Based on the improvements of the above embodiments, in this embodiment, the angles α of the first braided wire and the second braided wire with respect to the radial plane respectively, and the angle β between the first braided wire and the second braided wire on each cloth clamping layer 20 are designed as follows: The first cloth clamping layer 2 shown in this embodiment is specifically provided with three cloth clamping layers 20. In Figure 3 the first cloth clamping layer 20 shown, the angle α of the first braided wire with respect to the radial plane of the piston body 1 is 30°, and the angle α of the second braided wire with respect to the radial plane where the piston body 1 is located is 60°. At the same time, the angle β between the first braided wire and the second braided wire is 90°.

[0044] In Figure 4 the second cloth clamping layer 20 shown, the angle α of the first braided wire with respect to the radial plane where the piston body 1 is located is 45°, and the angle α of the second braided wire with respect to the radial plane where the piston body 1 is located is 45°. At the same time, the angle β between the first braided wire and the second braided wire is 90°.

[0045] In Figure 5 the third cloth clamping layer 20 shown, the angle α of the first braided wire with respect to the radial plane where the piston body 1 is located is 90°, and the angle α of the second braided wire with respect to the radial plane where the piston body 1 is located is 0°. At the same time, the angle β between the first braided wire and the second braided wire is 90°.

[0046] Furthermore, the cloth clamping layer 20 shown in this embodiment is annular and the two ends are connected together to form a joint, and the extending direction of the joint is parallel to the first braided wire or the second braided wire.

[0047] Thus, in this embodiment, it is convenient to splice the first cloth clamping layer 2 into an annular structure adapted to the side surface of the piston body 1 through the joint. When preparing the first cloth clamping layer 2, the first cloth clamping layer 2 can be cut on the original cloth along the first braided wire or the second braided wire, that is, the two edges of the first cloth clamping layer 2 corresponding to the joint can just be arranged along the first braided wire or the second braided wire, and the first braided wire or the second braided wire at the edge will not be sheared during shearing, ensuring the stability of the overall structure of the first cloth clamping layer 2.

[0048] Furthermore, as Figure 6As shown, in order to better improve the tear strength of the fabric layer 20, prevent the peeling between the woven fabric 210 and the glue, and ensure the wear resistance of the fabric layer 20 and the bonding strength between the fabric layer 20 and the piston body 1, the fabric layer 20 shown in this embodiment further includes a carboxyl nitrile rubber layer 211 cured integrally with the woven fabric 210 to form a carboxyl nitrile rubber composite layer 212 between two adjacent fabric layers 20. Among them, the thickness D of the carboxyl nitrile rubber composite layer 212 can be specifically set to 0.1 mm - 1.0 mm. For example, the thickness D can specifically be 0.1 mm, 0.3 mm, 0.5 mm or 1.0 mm. In addition, in other embodiments of the present application, it is not limited to the carboxyl nitrile rubber layer and can be other nitrile rubber layers.

[0049] Meanwhile, the piston body 1 shown in this embodiment includes a rubber body made of carboxyl nitrile rubber. In addition, in other embodiments of the present application, the piston body may also include a rubber body made of other nitrile rubbers.

[0050] It should be noted here that between the woven fabric 210 and the carboxyl nitrile rubber layer 211 shown in this embodiment, between two adjacent fabric layers 20, and between the fabric layer 20 and the piston body 1 are bonded integrally through a vulcanization process.

[0051] Furthermore, at least one of the first woven thread and the second woven thread shown in this embodiment includes cotton filaments and polyester filaments wound together.

[0052] Specifically, in this embodiment, cotton filaments are selected, which is beneficial to ensuring that each woven thread on the woven fabric 210 can be effectively bonded integrally with the carboxyl nitrile rubber layer 211. In this embodiment, polyester filaments are selected, which is beneficial to effectively enhancing the wear resistance of each woven thread on the woven fabric 210.

[0053] Furthermore, the proportion of cotton filaments in the first woven thread or the second woven thread wound with cotton filaments and polyester filaments is 60% - 95%, and the proportion of polyester filaments in the first woven thread or the second woven thread wound with cotton filaments and polyester filaments is 5% - 40%.

[0054] Among them, in this embodiment, the first woven thread or the second woven thread can be specifically set to be wound with 90% cotton filaments and 10% polyester filaments. The first woven thread or the second woven thread can also be selected to be wound with 80% cotton filaments and 20% polyester filaments. The first woven thread or the second woven thread can also be selected to be wound with 95% cotton filaments and 5% polyester filaments. The first woven thread or the second woven thread can also be selected to be wound with 60% cotton filaments and 40% polyester filaments. Of course, the first woven thread or the second woven thread can also be selected with other proportions of cotton filaments and polyester filaments, but it should be ensured that the proportion of cotton filaments in the corresponding woven thread is greater than that of polyester filaments.

[0055] Further, as Figures 1 to 2 shown, in order to enhance the wrapping effect of the first cloth layer 2 on the side surface of the piston body 1 and prevent the delamination phenomenon between the first cloth layer 2 and the piston body 1 due to the different elastic moduli of the first cloth layer 2 and the piston body 1, in this embodiment, a plurality of protrusions 11 are formed on the outer side surface of the piston body 1, and the first cloth layer 2 also covers the protrusions 11.

[0056] Specifically, a plurality of the protrusions 11 shown in this embodiment can be provided, and the plurality of protrusions 11 are arranged in a discrete manner on the side surface of the piston body 1. The shape of each protrusion 11 in the axial cross-section of the concrete piston includes a semicircle, a triangle, a rectangle, etc.

[0057] Meanwhile, the protrusions 11 shown in this embodiment can also be in an annular shape and are arranged along the circumferential direction of the piston body 1 on the side surface of the piston body 1. A plurality of the annular protrusions 11 shown in this embodiment can also be provided and are arranged at intervals in sequence along the axial direction of the piston body 1.

[0058] Further, as Figure 2 shown, the piston body 1 shown in this embodiment includes a lip end and a bottom end corresponding to the lip end. A second cloth layer 3 is covered on the end surface of the bottom end of the piston body 1. The first cloth layer 2 extends from the lip end to the bottom end of the piston body 1 on the side surface of the piston body 1 and is connected to the second cloth layer 3.

[0059] Specifically, the second cloth layer 3 shown in this embodiment has the same structure as the first cloth layer 2, and the second cloth layer 3 also includes a plurality of cloth layers 20. However, the number of the cloth layers 20 provided in the second cloth layer 3 is greater than the number of the cloth layers 20 provided in the first cloth layer 2, so that the thickness of the second cloth layer 3 is greater than the thickness of the first cloth layer 2.

[0060] Herein, in this embodiment, the extension edge of the first cloth layer 2 facing the bottom end of the piston body 1 can be specifically arranged to extend to the outer side surface of the second cloth layer 3, or the first cloth layer 2 can be specifically arranged to extend to the side surface of the second cloth layer 3 facing away from the piston body 1. While effectively ensuring the effective bonding area between the first cloth layer 2 and the second cloth layer 3, it can also prevent the first cloth layer 2 from detaching from the piston body 1, thereby ensuring the overall strength of the concrete piston shown in this embodiment.

[0061] It should be noted herein that in order to avoid the deformation of the bottom end of the piston body 1 under huge pressure, the second cloth layer 3 shown in this embodiment can be specifically provided with 10 cloth layers 20.

[0062] Preferably, this embodiment also provides a pumping device, including a delivery cylinder and the concrete piston as described above installed on the delivery cylinder. Among them, the pumping device shown in this embodiment can be a known trailer concrete pump, truck-mounted concrete pump, high-pressure mud pump, etc. in the art, and is not specifically limited herein.

[0063] Meanwhile, the pumping device shown in this embodiment further includes a hydraulic driving mechanism. The ejector rod of the hydraulic driving mechanism is axially connected to the middle part of the piston body 1 to drive the concrete piston to reciprocate in the delivery cylinder.

[0064] Preferably, this embodiment further provides a pumping device, and the pumping device includes the pumping device as described above. Among them, the pumping device can specifically be a concrete pump truck, a truck-mounted pump, a trailer pump, etc. well-known in the art.

[0065] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A concrete piston, characterized in that, include: Piston body; A first interlayer cloth is circumferentially coated on the outer side of the piston body; the first interlayer cloth comprises a plurality of interlayer cloth layers, the interlayer cloth layers comprise woven cloth and a carboxyl nitrile rubber layer solidified with the woven cloth, the woven cloth comprises first woven wires and second woven wires arranged crosswise, and the angle α formed by the first woven wires and the second woven wires on each of the interlayer cloth layers relative to the radial plane where the piston body is located is 0°<α<90°; The cloth layer further comprises a carboxyl nitrile rubber composite layer formed between two adjacent cloth layers; the piston body comprises a rubber body made of carboxyl nitrile rubber; A plurality of protrusions are formed on the outer surface of the piston body, and the first clamping cloth also covers the protrusions; The angle α between the first braided wire and the second braided wire on at least two of the interlayers is different relative to the radial plane; an angle β is formed between the first braided wire and the second braided wire on the interlayer, and the angle β between the first braided wire and the second braided wire on at least two of the interlayers is different.

2. The concrete piston according to claim 1, wherein, The angle α is 30°≤α≤60°.

3. The concrete piston according to claim 1, wherein, The interlayer is annular and has two ends connected together to form a seam, and an extending direction of the seam is parallel to the first braided wire or the second braided wire.

4. The concrete piston according to claim 1, characterized in that, At least one of the first braided wire and the second braided wire includes cotton yarn and polyester yarn entangled together.

5. The concrete piston according to claim 4, characterized in that, The cotton thread accounts for 60%-95% of the first braided thread or the second braided thread wound with the cotton thread and the polyester thread, and the polyester thread accounts for 5%-40% of the first braided thread or the second braided thread wound with the cotton thread and the polyester thread.

6. The concrete piston according to any one of claims 1 to 5, characterized in that, The piston body comprises a lip end and a bottom end corresponding to the lip end, the end surface of the bottom end is covered with a second cloth, the first cloth extends from the lip end to the bottom end and is connected to the second cloth; the first cloth extends to the outer side surface of the second cloth, or extends to a side surface of the second cloth away from the piston body; And / or, the thickness of the second sandwich cloth is greater than the thickness of the first sandwich cloth.

7. A pumping device, comprising a delivery cylinder, characterized in that, The delivery cylinder is equipped with a concrete piston as described in any one of claims 1 to 6.

8. A pumping device, characterized in that, Comprising a pumping device as claimed in claim 7.

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