Centering valve path system suitable for forklift
By adopting a centering valve valve circuit system with multi-hydraulic lock, edge valve and solenoid shut-off valve on the forklift, the problem of low motion accuracy of the traditional forklift clamping arm is solved, and the precise centering clamping of goods is achieved and the work efficiency is improved.
Patent Information
- Application Number
- CN202420392690.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The traditional forklift clamping arm has low operating accuracy and is difficult to meet some working conditions that require high neutrality of cargo clamping, resulting in cargo stacking and skewing, which reduces work efficiency.
A central valve road system suitable for forklifts is adopted, including multiple hydraulic locks, edge valves, solenoid shutoff valves and proximity switches. Through flexible switching of hydraulic cylinders and control of electromagnetic shutoff valves, the precise expansion and contraction of hydraulic cylinders and cargo are achieved. centered clamp.
It improves the operating accuracy and flexibility of the hydraulic cylinder, can more accurately control the center clamping of goods, adapt to working conditions with higher operating requirements, and improves working efficiency.
Smart Images
Figure CN222479099U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valve circuits of forklift attachments, in particular to a centering valve circuit system suitable for forklifts. Background Art
[0002] Forklift attachments, also known as various devices, are the best tools to make the forklift multi-purpose. It requires that a variety of work attachments can be easily replaced on a forklift based on the fork, so that the forklift can adapt to the needs of various working conditions. An important means to improve the efficiency and safety performance of the forklift and greatly reduce its damage is to equip the forklift with attachments.
[0003] Some forklifts used for cargo handling on the market use AGV forklifts. Intelligent unmanned transport vehicles are referred to as AGV forklifts, which are equipped with automatic guidance devices such as electromagnetic or optical devices. Because it is a fully automatic unmanned operation, it requires high precision in handling operations. The traditional forklift clamping arm clamping method is usually controlled by a throttle valve or a synchronization valve to control the movement on both sides. The accuracy error of its movement is 3%-10% of the cylinder stroke, and the movement accuracy is low. The attachment clamping arm is difficult to meet some working conditions that require high centering of cargo clamping, resulting in subsequent cargo stacking being easily skewed, which requires readjustment, greatly reducing work efficiency.
[0004] Based on the above background, a centering valve circuit system suitable for a forklift is proposed to solve the problem. Utility Model Content
[0005] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the structures specifically pointed out in the description and other drawings of the description.
[0006] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a centering valve circuit system suitable for a forklift.
[0007] To achieve the above-mentioned purpose, the technical solution of the utility model is: a centering valve circuit system suitable for a forklift, comprising: a first hydraulic lock, a second hydraulic lock, a third hydraulic lock, a rib valve, a left electromagnetic stop valve, a right electromagnetic stop valve, a first hydraulic cylinder, a second hydraulic cylinder, a proximity switch, a first oil port, and a second oil port. The first hydraulic lock and the second hydraulic lock are respectively connected to the first oil port, the first oil port and the second oil port are connected to the third hydraulic lock through the rib valve, the left electromagnetic stop valve and the right electromagnetic stop valve are respectively connected to the third hydraulic lock, the left electromagnetic stop valve is connected to the rod chamber of the first hydraulic cylinder, the right electromagnetic stop valve is connected to the rod chamber of the second hydraulic cylinder, the first hydraulic lock is connected to the rodless chamber of the first hydraulic cylinder, the second hydraulic lock is connected to the rodless chamber of the second hydraulic cylinder, and proximity switches are provided on one side of the first hydraulic cylinder and the second hydraulic cylinder.
[0008] Preferably, it also includes a pressure measuring port, which is connected in series with the left electromagnetic stop valve and the right electromagnetic stop valve respectively.
[0009] Preferably, the second oil port is externally connected to an oil tank oil circuit.
[0010] Preferably, the first oil port is externally connected to an oil tank oil circuit.
[0011] Preferably, the proximity switch is connected to the attachment of the forklift and is used for detecting the stroke of the clamp arm on the forklift attachment.
[0012] By adopting the above-mentioned technical scheme, the beneficial effect of the utility model is as follows: the utility model, through the cooperation of multiple hydraulic locks, rib valves, and electromagnetic stop valves, enables the hydraulic oil in the two chambers of the hydraulic cylinder to be flexibly exchanged, so that the hydraulic cylinder can flexibly complete the telescopic action. When telescoping, in order to achieve the retraction of the two hydraulic cylinders to clamp the goods in the center, a proximity switch arranged on the attachment is used, and the proximity switch is arranged in the middle. When the hydraulic cylinder on one side retracts and hits the proximity switch, the corresponding electromagnetic stop valve opens, closing the oil circuit on this side, and the hydraulic cylinder on the other side continues to retract to squeeze and push the goods until it retracts and hits the proximity switch on the other side, which is symmetrical with the hydraulic cylinder that stops retracting, and the main valve of the hydraulic station is closed. At this time, the goods are clamped in the center, thereby controlling the hydraulic cylinder to accurately reach the predetermined middle position and then stop. Compared with the traditional valve circuit system, the action accuracy is higher, the flexibility is stronger, and it is more suitable for working conditions with higher action requirements.
[0013] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.
[0014] Undoubtedly, these and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiments described with reference to various figures and drawings.
[0015] In order to make the above beneficial effects and other purposes, features and advantages of the present invention more obvious and easy to understand, one or several preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.
[0017] In the drawings, the same reference numerals are used for the same components and the drawings are schematic and not necessarily drawn to scale.
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only one or several embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on such drawings without paying creative work.
[0019] Figure 1 The utility model is a structural schematic diagram of a center valve circuit system suitable for a forklift.
[0020] Explanation of main figure marks: first hydraulic lock -1, second hydraulic lock -2, third hydraulic lock -3, ridge valve -4, left electromagnetic stop valve -5, right electromagnetic stop valve -6, first hydraulic cylinder -7, second hydraulic cylinder -8, proximity switch -9, first oil port -10, second oil port -11, pressure measuring port -12. DETAILED DESCRIPTION
[0021] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.
[0022] Meanwhile, in the following description, many specific details are set forth for the purpose of explanation to provide a thorough understanding of the embodiments of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without the specific details or the specific manner described herein.
[0023] See also Figure 1The utility model provides a centering valve circuit system suitable for a forklift, comprising: a first hydraulic lock 1, a second hydraulic lock 2, a third hydraulic lock 3, a rib valve 4, a left electromagnetic stop valve 5, a right electromagnetic stop valve 6, a first hydraulic cylinder 7, a second hydraulic cylinder 8, a proximity switch 9, a first oil port 10, and a second oil port 11. The first hydraulic lock 1 and the second hydraulic lock 2 are respectively connected to the first oil port 10, the first oil port 10 and the second oil port 11 are connected to the third hydraulic lock 3 through the rib valve 4, the left electromagnetic stop valve 5 and the right electromagnetic stop valve 6 are respectively connected to the third hydraulic lock 3, the left electromagnetic stop valve 5 is connected to the rod cavity of the first hydraulic cylinder 7, the right electromagnetic stop valve 6 is connected to the rod cavity of the second hydraulic cylinder 8, the first hydraulic lock 1 is connected to the rodless cavity of the first hydraulic cylinder 7, the second hydraulic lock 2 is connected to the rodless cavity of the second hydraulic cylinder 8, and a proximity switch 9 is provided on one side of the first hydraulic cylinder 7 and the second hydraulic cylinder 8.
[0024] According to some embodiments of the present application, optionally, a pressure measuring port 12 is further included, and the pressure measuring port 12 is respectively connected in series with the left electromagnetic stop valve 5 and the right electromagnetic stop valve 6. It has the function of measuring the pressure of the pipelines of the left electromagnetic stop valve 5 and the right electromagnetic stop valve 6 in real time, which is more conducive to the protection and control of the pipelines.
[0025] According to some embodiments of the present application, the second oil port 11 is optionally connected to an oil tank oil circuit, which has the function of supplying and discharging oil to the rod chamber of the first hydraulic cylinder 7 and the second hydraulic cylinder 8 .
[0026] According to some embodiments of the present application, the first oil port 10 is optionally connected to an oil tank oil circuit, which has the function of supplying and discharging oil to the rodless chamber of the first hydraulic cylinder 7 and the second hydraulic cylinder 8 .
[0027] According to some embodiments of the present application, the proximity switch 9 is optionally connected to the forklift attachment and used for detecting the stroke of the clamp arm on the forklift attachment. When the first hydraulic cylinder 7 and the second hydraulic cylinder 8 move the clamp arm of the forklift attachment, the proximity switch 9 can detect the stroke thereof, thereby controlling it to push the cargo to the center for clamping.
[0028] During use, when the first hydraulic cylinder 7 and the second hydraulic cylinder 8 need to be extended quickly, oil is introduced through the first oil port 10, and the hydraulic oil reaches the rodless chamber of the first hydraulic cylinder 7 and the second hydraulic cylinder 8 through the first hydraulic lock 1 and the second hydraulic lock 2. At the same time, the second oil port 11 is closed, and then the circuit between the first oil port 10 and the third hydraulic lock 3 is closed through the rib valve 4, and then the third hydraulic lock 3 is opened, and the hydraulic oil in the rod chamber of the first hydraulic cylinder 7 and the second hydraulic cylinder 8 returns to the rodless chamber through the left electromagnetic stop valve 5, the right electromagnetic stop valve 6, and the third hydraulic lock 3. At this time, the two chambers of the hydraulic cylinder are connected. Due to the difference in area between the two chambers, the hydraulic oil is directly added to the rodless chamber, thereby achieving the purpose of rapid extension of the hydraulic cylinder; when the first hydraulic cylinder 7 and the second hydraulic cylinder 8 need to be retracted, oil is introduced through the second oil port 11, and the hydraulic oil Then it reaches the rod chamber of the hydraulic cylinder through the edge valve 4, the third hydraulic lock 3, the left electromagnetic stop valve 5, and the right electromagnetic stop valve 6. At the same time, the hydraulic oil in the rodless chamber flows out of the first oil port 10 through the opened first hydraulic lock 1 and the second hydraulic lock 2 and returns to the oil tank, so that oil enters one chamber of the hydraulic cylinder and returns to the other chamber, and the two hydraulic cylinders retract; wherein, in order to achieve the retraction of the two hydraulic cylinders to clamp the goods in the center, a proximity switch 9 is arranged on the attachment, and the proximity switch 9 is arranged in the middle. When the hydraulic cylinder on one side retracts and hits the proximity switch 9, the corresponding electromagnetic stop valve opens to close the oil circuit on this side, and the hydraulic cylinder on the other side continues to retract to squeeze and push the goods until it retracts and hits the proximity switch 9 on the other side, which is symmetrical with the hydraulic cylinder that stops retracting, and the main valve of the hydraulic station is closed. At this time, the goods are clamped in the center.
[0029] It should be understood that the embodiments disclosed in the present invention are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.
[0030] The "embodiment" mentioned in the specification means that the specific features or characteristics described in conjunction with the embodiment are included in at least one embodiment of the utility model. Therefore, the phrases or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.
[0031] In addition, the described features or characteristics may be combined in one or more embodiments in any other suitable manner. In the above description, some specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of the embodiments of the utility model. However, those skilled in the relevant art will understand that the utility model can be implemented without one or more of the above specific details or can also be implemented using other methods, components, materials, etc.
Claims
1. A centering valve circuit system suitable for a forklift, characterized in that: include: A first hydraulic lock (1), a second hydraulic lock (2), a third hydraulic lock (3), a rib valve (4), a left electromagnetic stop valve (5), a right electromagnetic stop valve (6), a first hydraulic cylinder (7), a second hydraulic cylinder (8), a proximity switch (9), a first oil port (10), and a second oil port (11). The first hydraulic lock (1) and the second hydraulic lock (2) are respectively connected to the first oil port (10). The first oil port (10) and the second oil port (11) are connected to the third hydraulic lock (3) through the rib valve (4). The left electromagnetic stop valve (5) and the right electromagnetic stop valve (6) are respectively connected to the third hydraulic lock (3). The left electromagnetic stop valve (5) is connected to the rod cavity of the first hydraulic cylinder (7). The right electromagnetic stop valve (6) is connected to the rod cavity of the second hydraulic cylinder (8). The first hydraulic lock (1) is connected to the rodless cavity of the first hydraulic cylinder (7). The second hydraulic lock (2) is connected to the rodless cavity of the second hydraulic cylinder (8). A proximity switch (9) is provided on one side of each of the first hydraulic cylinder (7) and the second hydraulic cylinder (8).
2. A centering valve circuit system suitable for a forklift according to claim 1, characterized in that: It also includes a pressure measuring port (12), which is connected in series with the left electromagnetic stop valve (5) and the right electromagnetic stop valve (6) respectively.
3. A centering valve circuit system suitable for a forklift according to claim 1, characterized in that: The second oil port (11) is externally connected to an oil tank oil circuit.
4. A centering valve circuit system suitable for a forklift according to claim 1 or 3, characterized in that: The first oil port (10) is externally connected to an oil tank oil circuit.
5. The centering valve circuit system suitable for a forklift according to claim 1, characterized in that: The proximity switch (9) is connected to the forklift attachment and is used for detecting the stroke of the clamp arm on the forklift attachment.