CN108591812A - A kind of J-type forklift door frame hot-rolled steel section - Google Patents
A kind of J-type forklift door frame hot-rolled steel section Download PDFInfo
- Publication number
- CN108591812A CN108591812A CN201810652622.0A CN201810652622A CN108591812A CN 108591812 A CN108591812 A CN 108591812A CN 201810652622 A CN201810652622 A CN 201810652622A CN 108591812 A CN108591812 A CN 108591812A
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- China
- Prior art keywords
- wing plate
- web
- door frame
- rolled steel
- forklift door
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/08—Masts; Guides; Chains
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/09—Other lifting devices
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The present invention provides a kind of J-type forklift door frame hot-rolled steel section, shaped steel includes the first wing plate, the second wing plate, third wing plate and web；The both ends of web lower surface are connect with the first wing plate and the second wing plate respectively；The upper surface of web is connect with third wing plate, and the distance between third wing plate and the first wing plate are more than the distance between third wing plate and the second wing plate；It is mutually parallel between first wing plate, the second wing plate and third wing plate and is respectively perpendicular to web；The medial surface of first wing plate and the connection of web are equipped with wedge-shaped platform；The medial surface of second wing plate and the junction of web are equipped with first boss；Third wing plate is equipped with second boss close to the side of the first wing plate and the junction of web.A kind of J-type forklift door frame hot-rolled steel section provided by the invention, during combination produces forklift door frame, under same bearer ability, save rolled steel dosage, the dead weight that entirety alleviates portal frame system improves production and working efficiency to reduce the production cost of gantry-shaped steel.
Description
Technical field
The present invention relates to hot rolling steel type technical field, more particularly to a kind of J-type forklift door frame hot-rolled steel section.
Background technology
Fork truck is widely used in storage and logistic industry.Forklift door frame is the mechanism of forklift lifting cargo, forklift door frame institute
The strength and stiffness of the shaped steel of use directly influence lifting capacity and the safety of fork truck.In the prior art, often through increasing
Add shaped steel thickness used in forklift door frame or improves the integral strength of forklift door frame by improving the intensity of section steel material, but
The section weight for also increasing shaped steel simultaneously, increases the overall weight of forklift door frame, reduces the load of fork truck, and
By the increase for the shaped steel weight purchased, the increase of the manufacturing cost of fork truck enterprise is resulted in, economic effect is greatly reduced.
Invention content
The purpose of the present invention is to provide a kind of J-type forklift door frame hot-rolled steel sections, right by using the different wing plate of thickness
Shaped steel global sections are designed, and the integral strength and rigidity of door frame, drop are improved while mitigating gantry-shaped steel of forklift weight
Low fork truck manufacturing cost.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of J-type forklift door frame hot-rolled steel section, which is characterized in that the shaped steel includes：First wing plate, the second wing plate,
Three wing plates and web；
The both ends of the lower surface of the web are connect with first wing plate and second wing plate respectively；
The upper surface of the web is connect with the third wing plate, in the web length direction, the third wing plate
The distance between described first wing plate is more than the distance between the third wing plate and second wing plate；
It is mutually parallel between first wing plate, second wing plate and the third wing plate and is respectively perpendicular to the abdomen
Plate；
The medial surface of first wing plate is provided with wedge-shaped platform with the connection of the web；Second wing plate it is interior
Side and the junction of the web are provided with first boss；The third wing plate close to the side of first wing plate with it is described
The junction of web is provided with second boss.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, the J-type forklift door frame hot-rolled steel section is integrated heat
Roll bonding structure.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, the length of first wing plate is equal to second wing
The length of plate, the length of first wing plate are more than the length of the third wing plate.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, the length of first wing plate and the third wing plate
Difference be 10mm-15mm.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, the thickness of the first wing plate is more than second wing plate
Thickness, the thickness of second wing plate are more than the thickness of the third wing plate.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, first wing plate is connect with the web upper surface
Place's transition portion is the second circular arc, and second wing plate is the first circular arc with web upper surface junction transition portion；
The radius of first circular arc is more than the radius of second circular arc, second described in the radius ratio of first circular arc
The big 5mm-8mm of radius of circular arc.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, third wing plate upper surface and the third wing plate
Transition portion is third circular arc between the side of second wing plate, plane and the third wing plate on the third wing plate
Transition portion is the 4th circular arc between the side of first wing plate；
The radius of the third circular arc is more than the radius of the 4th circular arc, the 4th described in the radius ratio of the third circular arc
The big 4mm-6mm of radius of circular arc.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, the length of the wedge shape platform is 30mm-40mm, height
For 1mm-5mm, the lower surface junction of the wedge shape platform and the web uses smooth curved transition, the wedge shape platform with it is described
The junction of first wing plate uses smooth curved transition.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, the length of the first boss is 25mm-30mm, high
Degree is 3mm-5mm, and the first boss is 2%-10%, the first boss relative to the gradient of the lower surface of the web
Smooth curved transition is used with the lower surface junction of the web, the first boss and the junction of second wing plate are adopted
Use smooth curved transition.
Preferably, in above-mentioned J-type forklift door frame hot-rolled steel section, the length of the second boss is 25mm-30mm, high
Degree is 3mm-5mm, and the second boss is 2%-10%, the second boss relative to the gradient of the upper surface of the web
Upper surface junction with the web is smooth curved transition, and the second boss and the junction of the third wing plate are flat
Sliding curve transition.
Compared with prior art, the present invention has the advantages that：
A kind of J-type forklift door frame hot-rolled steel section provided by the invention, during combination produces forklift door frame, same bearer
Under ability, rolled steel dosage is saved, integrally alleviates the dead weight of portal frame system, to reduce the production cost of gantry-shaped steel,
Improve production and working efficiency.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.Wherein：
Fig. 1 is a kind of structural schematic diagram of J-type forklift door frame hot-rolled steel section of the present invention.
Fig. 2 is a kind of J-type forklift door frame hot-rolled steel section of the present invention and the structural schematic diagram that C-type steel is applied in combination.
Reference sign：The first wing plates of 1-, the second wing plates of 2-, 3- thirds wing plate, 4- webs, 5- wedge shapes platform, 6- first
Boss, 7- second boss, the first circular arcs of 8-, the second circular arcs of 9-, 10- thirds circular arc, the 4th circular arcs of 11-.
Specific implementation mode
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.The explanation of each example through the invention
Mode, which provides, to be not intended to limit the present invention.In fact, those skilled in the art will be clear that, the scope of the present invention or essence are not being departed from
In the case of god, it can modify in the present invention and modification.For example, being illustrated or described as the spy of the part of one embodiment
Sign can be used for another embodiment, to generate another embodiment.Thus, it may be desirable to which the present invention includes to be included into appended power
Such modifications and variations in the range of profit requirement and its equivalent.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the present invention rather than require the present invention must be with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.The term " connected " that is used in the present invention, " connection " shall be understood in a broad sense, for example, it may be fixedly connected,
It may be a detachable connection；It can be directly connected, can also be indirectly connected by intermediate member, for the common of this field
For technical staff, the concrete meaning of above-mentioned term can be understood as the case may be.
As shown in Figure 1, being a kind of structural schematic diagram of J-type forklift door frame hot-rolled steel section provided by the invention.The J-type fork truck
Door frame hot-rolled steel section includes：Web 4 and the first wing plate 1 being connect with web 4, the second wing plate 2 and third wing plate 3, web 4
Lower surface is connect with the first wing plate 1 and the second wing plate 2 respectively, forms c-type structure.
Specifically, lower surface one end (left end in such as Fig. 1) of web 4 is connect with the first wing plate 1, the lower surface of web 4
The other end (the right left end in such as Fig. 1) is connect with the second wing plate 2, and the first wing plate 1 and the second wing plate 2 are parallel to each other and perpendicular to abdomen
Plate 4 is arranged.
A side (left side of the first wing plate 1 as shown in fig. 1) for first wing plate 1 is connect with the upper surface of web 4
It is the second circular arc 9 that place, which uses arc transition, changeover portion, and a side of the second wing plate 2 be (the second wing plate 2 as shown in fig. 1
Right side) to use arc transition, changeover portion with the upper surface junction of web 4 be the first circular arc 8.Preferably, the first circular arc 8
Radius be more than the second circular arc 9 radius, the big 5mm-8mm of radius of the second circular arc of radius ratio 9 of the first circular arc 8.It is arranged such
It is for J-type door frame when the case where reducing J-type door frame and generation is interfered in other door frames cooperation installation process, i.e. operation and other
Friction is not generated when door frame relative motion, while the weight of door frame can be reduced.
One end that the lower surface of web 4 is connect with the first wing plate 1 is provided with wedge-shaped platform 5；The lower surface of web 4 and second wing
One end that plate 2 connects is provided with first boss 6.
The length of wedge-shaped platform 5 is 30mm-40mm, is highly 1mm-5mm, is not limited in concrete numerical value the present embodiment.Wedge
The lower surface junction of shape platform 5 and web 4 uses smooth curved transition, junction (i.e. such as Fig. 1 of wedge-shaped platform 5 and the first wing plate 1
Shown in the first wing plate 1 right side) use smooth curved transition.Above-mentioned junction makes stress more at smooth curved transition
Uniformly, integrally bending stress and local stress numerical more they tend to balance, and safety coefficient improves.It is directed toward second wing in the first wing plate 1
On the direction of plate 2, the thickness of wedge-shaped platform 5 is gradually thinning, which refers to that the direction parallel with the first wing plate is (vertical in Fig. 1
Direction) on thickness.
The length of first boss 6 is 25mm-30mm, is highly 3mm-5mm, is not limited in concrete numerical value the present embodiment.
First boss 6 is 2%-10%, the lower surface junction of first boss 6 and web 4 relative to the gradient of the lower surface of web 4
Using smooth curved transition, the junction (left side of the second wing plate 2 i.e. as shown in fig. 1) of first boss 6 and the second wing plate 2
Using smooth curved transition.Above-mentioned junction makes stress evenly at smooth curved transition, and integrally bending stress and part are answered
Power numerical value more they tends to balance, and safety coefficient improves.
The lower surface of corresponding web 4 is connected with the first wing plate 1 and the second wing plate 2, upper surface one end and the third wing of web 4
Plate 3 connects, herein third wing plate 3 not with the setting of the second wing plate 2 in the same plane, be whole in order to reduce after coordinating with C-type steel
Space shared by body door frame, in case influencing truck driver operates sight.Wherein, third wing plate 3 and the first wing plate 1 and second wing
It is mutually parallel between plate 2 and is respectively perpendicular to the setting of web 4.I.e. the lower face of the upper surface of third wing plate 3 and the first wing plate 1 and
The lower face of second wing plate 2 is parallel with the upper and lower surface of web 4.The end of first wing plate 1, the second wing plate 2 and third wing plate 3
Face and respective side junction are all made of smooth curve transition, wherein the upper surface of third wing plate 3 with its own close to the
One side (right side of third wing plate 3 as shown in fig. 1) junction of two wing plates 2 uses 10 transition of third circular arc, the third wing
Another side (left side of third wing plate 3 as shown in fig. 1) of the upper surface of plate 3 and close first wing plate 1 of its own
Between transition portion be the 4th circular arc 11.
The radius of third circular arc 10 on third wing plate 3 is more than the radius of the 4th circular arc 11, the radius ratio of third circular arc 10
The big 4mm-6mm of radius of 4th circular arc 11.Such setting is produced with other door frames cooperation installation process to reduce J-type door frame
The case where raw interference, while the weight of door frame can be reduced.
In the upper surface of web 4, the is equipped with close to the one side (for the left side of third wing plate 3 in Fig. 1) of third wing plate 3
The length of two boss 7, second boss 7 is 25mm-30mm, is highly 3-5mm, upper surface of the second boss 7 relative to web 4
The gradient of (upper surface of web 4 is horizontal plane) is 2%-10%, and second boss 7 and the upper surface junction of web 4 are flat
The junction of sliding curve transition, second boss 7 and third wing plate 3 is smooth curved transition.Second boss 7 is set, J can be increased
Type gantry-shaped steel global sections rigidity.Above-mentioned junction makes stress evenly at smooth curved transition, integrally bending stress and
Local stress numerical value more they tends to balance, and safety coefficient improves.
Further, the length of the first above-mentioned wing plate 1 is equal to the length of the second wing plate 2, and the length of the first wing plate 1 is more than
The upper surface of the length of third wing plate 3, the second wing plate 2 is parallel with the upper surface of web 4.The length of first wing plate 1 and the third wing
The difference of plate 3 is 10mm-15mm.The thickness of first wing plate 1 is more than the thickness of the second wing plate 2, and the thickness of the second wing plate 2 is more than the
The thickness of three wing plates 3.Its thickness has difference, i.e., the first wing plate 1, the second wing plate 2 and third wing plate 3 is arranged to different-thickness
Rolled steel dosage can be saved, mitigates the dead weight of whole portal frame system, to reduce the manufacturing cost of fork truck.
Preferably, the first wing plate 1, the second wing plate 2, third wing plate 3 and web 4 are integrated hot rolling structure.
J-type forklift door frame hot-rolled steel section provided by the invention, for manufacturing all kinds of forklift door frames, usually by itself and its alloytype
Steel is applied in combination.For example, as shown in Fig. 2, being that a kind of J-type forklift door frame hot-rolled steel section of the invention is applied in combination with C-type steel
Structural schematic diagram.In use, by the side of the third wing plate 3 of the J-type forklift door frame hot-rolled steel section of invention and C-type steel wing plate
Surface is matched by shimming.Since third wing plate 3 will be placed into c-type gantry-shaped steel, the wing plate length of c-type gantry-shaped steel
Of substantially equal with the length of the first wing plate 1, the length setting of setting third wing plate 3 can reduce and match less than the length of the first wing plate 1
Close gap.
Preferably, the third wing plate 3 of the application is far from second boss 7 side (right side of third wing plate 3 in such as Fig. 2
Side) with the arc radius of the upper surface transition portion of web 4 it is more than the arc radius on one side wing of C-type steel coordinated with it
(lower left corner of C-type steel right side wing plate, is smaller circular arc in such as Fig. 2).It is on the one hand to increase by 3 bending resistance energy of third wing plate
On the other hand power can ensure that C-type steel is not fitted closely with J section steel, there are gaps, when J-type door frame being avoided to be moved with c-type door frame
Generate friction.
By the J-type forklift door frame hot-rolled steel section of the present invention and C-type steel combination manufacture forklift door frame, J-type fork truck of the invention
Door frame hot-rolled steel section strong modularity integrally alleviates the dead weight of portal frame system for manufacturing forklift door frame, reduces the life of door frame
Produce cost.
Compared with prior art, the present invention has the advantages that：
The J-type forklift door frame hot-rolled steel section strong modularity of the present invention integrally alleviates door frame system for manufacturing forklift door frame
The dead weight of system reduces the production cost of door frame；Rolled steel dosage is saved, to reduce the manufacturing cost of fork truck.
It these are only the preferred embodiment of the present invention, be not intended to restrict the invention, those skilled in the art is come
It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any modification made by is equal
Replace, improve etc., it should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of J-type forklift door frame hot-rolled steel section, which is characterized in that the shaped steel includes：First wing plate, the second wing plate, third
Wing plate and web；
The both ends of the lower surface of the web are connect with first wing plate and second wing plate respectively；
The upper surface of the web is connect with the third wing plate, in the web length direction, the third wing plate and institute
It states the distance between first wing plate and is more than the distance between the third wing plate and second wing plate；
It is mutually parallel between first wing plate, second wing plate and the third wing plate and is respectively perpendicular to the web；
The medial surface of first wing plate is provided with wedge-shaped platform with the connection of the web；The medial surface of second wing plate
The junction of the web is provided with first boss；The third wing plate is close to the side of first wing plate and the web
Junction be provided with second boss.
2. a kind of J-type forklift door frame hot-rolled steel section according to claim 1, which is characterized in that the J-type forklift door frame heat
It rolls shaped steel and is integrated hot rolling structure.
3. a kind of J-type forklift door frame hot-rolled steel section according to claim 1, which is characterized in that the length of first wing plate
Degree is equal to the length of second wing plate, and the length of first wing plate is more than the length of the third wing plate.
4. a kind of J-type forklift door frame hot-rolled steel section according to claim 3, which is characterized in that the length of first wing plate
The difference of degree and the third wing plate is 10mm-15mm.
5. a kind of J-type forklift door frame hot-rolled steel section according to claim 1, which is characterized in that the thickness of first wing plate
Degree is more than the thickness of second wing plate, and the thickness of second wing plate is more than the thickness of the third wing plate.
6. a kind of J-type forklift door frame hot-rolled steel section according to claim 1, which is characterized in that first wing plate and institute
It is the second circular arc, second wing plate and web upper surface junction transition part to state web upper surface junction transition portion
It is divided into the first circular arc；
The radius of first circular arc is more than the radius of second circular arc, the second circular arc described in the radius ratio of first circular arc
The big 5mm-8mm of radius.
7. a kind of J-type forklift door frame hot-rolled steel section according to claim 1, which is characterized in that third wing plate upper end
Face and the third wing plate transition portion between the side of second wing plate are third circular arc, are put down on the third wing plate
Face and the third wing plate transition portion between the side of first wing plate are the 4th circular arc；
The radius of the third circular arc is more than the radius of the 4th circular arc, the 4th circular arc described in the radius ratio of the third circular arc
The big 4mm-6mm of radius.
8. a kind of J-type forklift door frame hot-rolled steel section according to claim 1, which is characterized in that the length of the wedge shape platform
It is highly 1mm-5mm for 30mm-40mm, the lower surface junction of the wedge shape platform and the web uses smooth curved transition,
The junction of the wedge shape platform and first wing plate uses smooth curved transition.
9. a kind of J-type forklift door frame hot-rolled steel section according to claim 1, which is characterized in that the length of the first boss
Degree is 25mm-30mm, is highly 3mm-5mm, and the first boss is 2%- relative to the gradient of the lower surface of the web
10%, the lower surface junction of the first boss and the web uses smooth curved transition, the first boss with it is described
The junction of second wing plate uses smooth curved transition.
10. a kind of J-type forklift door frame hot-rolled steel section according to claim 1, which is characterized in that the length of the second boss
Degree is 25mm-30mm, is highly 3mm-5mm, and the second boss is 2%- relative to the gradient of the upper surface of the web
10%, the upper surface junction of the second boss and the web is smooth curved transition, the second boss and described the
The junction of three wing plates is smooth curved transition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810652622.0A CN108591812A (en) | 2018-06-22 | 2018-06-22 | A kind of J-type forklift door frame hot-rolled steel section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810652622.0A CN108591812A (en) | 2018-06-22 | 2018-06-22 | A kind of J-type forklift door frame hot-rolled steel section |
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| Publication Number | Publication Date |
|---|---|
| CN108591812A true CN108591812A (en) | 2018-09-28 |
Family
ID=63633922
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810652622.0A Pending CN108591812A (en) | 2018-06-22 | 2018-06-22 | A kind of J-type forklift door frame hot-rolled steel section |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112794243A (en) * | 2021-01-29 | 2021-05-14 | 山东钢铁股份有限公司 | Fork truck is hot rolling J shaped steel for portal |
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| CN205527582U (en) * | 2016-04-21 | 2016-08-31 | 唐山盛航环保机车制造有限公司 | Fork truck is biconvex platform deformed steel for portal |
| CN207230145U (en) * | 2017-08-08 | 2018-04-13 | 安徽合力股份有限公司 | A kind of J-type channel steel |
| CN208331755U (en) * | 2018-06-22 | 2019-01-04 | 山东钢铁股份有限公司 | A kind of J-type forklift door frame hot-rolled steel section |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000001296A (en) * | 1998-06-15 | 2000-01-07 | Toyota Autom Loom Works Ltd | Sectional form of mast rail for fork lift |
| US20030057027A1 (en) * | 2001-09-21 | 2003-03-27 | Simpson Stan J. | Mast for a fork lift |
| CN2598981Y (en) * | 2003-01-23 | 2004-01-14 | 安徽合力股份有限公司 | Special-purpose portal frame section steel for forklift |
| CN201240808Y (en) * | 2008-08-01 | 2009-05-20 | 雷晓卫 | J type forklift gantry section steel |
| CN204384822U (en) * | 2014-12-03 | 2015-06-10 | 山东钢铁股份有限公司 | A kind of forklift door frame hot rolling J section steel |
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| CN205527582U (en) * | 2016-04-21 | 2016-08-31 | 唐山盛航环保机车制造有限公司 | Fork truck is biconvex platform deformed steel for portal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112794243A (en) * | 2021-01-29 | 2021-05-14 | 山东钢铁股份有限公司 | Fork truck is hot rolling J shaped steel for portal |
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